182.  Samir Kumar Saha, R. Kumar, A. Kuchuk, T. Morgan, P.K. Ghosh, M.Z. Alavijeh, S.-Q. Yu, G. Salamo, III-As Growth on c-plane Sapphire by MBE, MIOMD 2018 (Flagstaff, Arizona), WeA12.

181.  S.K. Saha, Rahul Kumar, A. Kuchuk, T. Morgan, P.K. Ghosh, M.Z. Alavijeh, S.-Q. Yu, G. Salamo, Reduction of Twin formation in GaAs/Sapphire Grown by MBE, MIOMD 2018 (Flagstaff, Arizona), WeA11.

180.  GePb Alloys for Mid-IR Optoelectronics Applications, Aboozar Mosleh, H. Alahmad, M. Alher, S.F. Banihashemian, S. A. Ghetmiri, S. Al-Kabi, W. Du, B. Li, S.-Q. Yu, H. Naseem, MIOMD 2018 (Flagstaff, Arizona), WeA10.

179.  W. Dou, P. Grant, J. Grant, H. Tran, W. Du, M. Mortazavi, B. Li, H. Naseem, S.-Q. Yu, Bader Alharthi, Buffer-free GeSn on Si Substrate by Plasma Enhanced Chemical Vapor Deposition, MIOMD 2018 (Flagstaff, Arizona), WeA9.

178.  J. Grant, W. Dou, B. Alharthi, H. Tran, A. Mosleh, W. Du, B. Li, M. Mortizavi, H. Naseem, S.-Q. Yu, Perry Grant, Growth and Characterization of GeSn using UHV‐CVD System, MIOMD 2018 (Flagstaff, Arizona), WeA6.

177.  W. Du, SA. Ghetmiri, Y. Zhang, S. El-Ghazaly, J. Margetis, J. Tolle, G. Sun, R. Soref, B. Li, G. Salamo, M. Mortazavi, Shui-Qing Yu, GeSn Lasers and Photodetectors: Key Components for Mid-IR Integrated Microwave Photonics on the SOI Platform, MIOMD 2018 (Flagstaff, Arizona), WeA5.

176.  Abbas Sabbar, Syam Madhusoodhanan, Sattar Al-Kabi, Binzhong Dong, Jiangbo Wang , Stanley Atcitty, Robert Kaplar, H. Alan Mantooth, Shui-Qing Yu, and Zhong Chen, High Temperature Photoluminsence of InGaN-based MQWs on Patterned Sapphire Substrates, 31st Annual Conference of the IEEE Photonics Society, Reston, VA, USA (2018).

175.  Takayuki Hironaka, Xian Hu, Jeb Stacy, Ishiang Shih, Jin Hu, Gregory Salamo, Shui-Qing Yu, Hugh Churchill, Exfoliation and characterization of the 1D van der Waals material tellurium, Bulletin of the American Physical Society, P35.00006, 2018.

174.  Abbas Sabbar, Syam Madhusoodhanan, Binzhong Dong, Jiangbo Wang, Shui-Qing Yu, and Zhong Chen, Investigation of High Temperature Photoluminescence Efficiency from InGaN/GaN MQWs, CLEO 2018 (San Jose): Applications and Technology, JTh2A. 79.

173.  Perry C. Grant, Joe Margetis, Yiyin Zhou, Wei Dou, Grey Abernathy, Andrian Kuchuk, Wei Du, Seyed A. Ghetmiri, Baohua Li, John Tolle, Jifeng Liu, Greg Sun, Richard A. Soref, Mansour Mortazavi, Shui-Qing Yu, Direct Bandgap Type-I GeSn Quantum Well toward Si-based Optoelectronics, CLEO 2018 (San Jose): Science and Innovations, STh4I. 4.

172.  Huong Tran, Thach Pham, Wei Du, Yang Zhang, Amir Ghetmiri, Perry C. Grant, Joshua M. Grant, Greg Sun, Richard A. Soref, Joe Margetis, John Tolle, Baohua Li, Mansour Mortazavi, and Shui-Qing Yu, Systematic Study of Ge_0.89Sn_0.11 Photodiodes for Low-Cost Shortwave Infrared Imaging, CLEO 2018 (San Jose): Science and Innovations, STh4I. 2.

171.  Wei Dou, Yiyin Zhou, Joe Margetis, Seyed Amir Ghetmiri, Wei Du, Jifeng Liu, Greg Sun, Richard A. Soref, John Tolle, Baohua Li, Mansour Mortazavi, and Shui-Qing Yu, Optically Pumped GeSn-edge-emitting Laser with Emission at 3 µm for Si Photonics, CLEO 2018 (San Jose): Applications and Technology, AF1Q. 5.

170.  Yang Zhang, Yang Wu, Xiaoxin Wang, Eric R. Fossum, Rahul Kumar, Jifeng Liu, Gregory Salamo, and Shui-Qing Yu, Harnessing Quantum Wave Nature of Individual Electrons for Single Photon Detection, CLEO 2018 (San Jose): QELS_Fundamental Science, FW3F. 8.

169.   Sattar Al-Kabi, Seyed Amir Ghetmiri, Joe Margetis, Thach Pham, Yiyin Zhou, Wei Dou, Wei Du, Aboozar Mosleh, Jifeng Liu, Greg Sun, Richard A. Soref, John Tolle, Baohua Li, Mansour Mortazavi, Hameed A. Naseem, and Shui-Qing Yu, Optically pumped Si-based edge-emitting GeSn laser, CLEO 2017, SW4C. 1

168.  Huong Tran,  Thach Pham, Wei Du, Joe Margetis, Yiyin Zhou,  Perry C. Grant, Greg Sun, Richard A. Soref, John Tolle, Baohua Li, Mansour Mortazavi,  Hameed A. Naseem,  and Shui-Qing Yu, Temperature Dependent Study of Lifetime and Minority Carrier Diffusion Constant for Ge_0.89Sn_0.11 Photoconductors, CLEO 2017, STu1N. 6

167.  Wei Du, Seyed Ghetmiri, Sattar Al-Kabi, Joe Margetis, Yiyin Zhou, Wei Dou, Aboozar Mosleh, Jifeng Liu, Greg Sun, Richard Soref, John Tolle, Baohua Li, Mansour Mortazavi, , and Shui-Qing Yu, Study of SiGeSn/GeSn/SiGeSn Quantum Well towards All Group-IV-Optoelectronics, CLEO 2017, STh3I. 3

166.  Hakimah Alahmad, Murtath Alher, Sattar Al-Kabi, Seyed Amir Ghetmiri, Aboozar Mosleh, Shui-Qing Yu, Hameed Naseem, Growth and characterization of GePb Alloy using layer inversion method, EMC 2017. 

165  P.C. Grant, W. Dou, B. Alharthi, J. Grant, A. Mosleh, W. Du, B. Li, M. Mortizavi, H.A. Naseem, S.-Q. Yu, Dilute GeSn: A study on the Effects of Adding Stannic Chloride to UHV-CVD Growth, EMC 2017.

164.  Bader Alharthi, Joshua M. Grant, Wei Dou, Perry C. Grant, Aboozar Mosleh, Wei Du, Mansour Mortazavi, Baohua Li, Hameed Naseem, and Shui-Qing Yu, Low Temperature Ge Growth Using Plasma Enhanced CVD Technique, EMC 2017.   

163.  Timothy Eales, Igor P. Marko, Seyed A. Ghetmiri, Wei Du, Yiyin Zhou, Shui-Qing Yu, Joe Margetis, John Tolle, Stefan Schulz, Edmond O’Halloran, Eoin P. O’Reilly and Stephen J. Sweeney, New experimental evidence for nature of the band gap of GeSn Alloys, SPIE Photonics West, No. 10108-48, Jan 30-Feb 1, 2017, San Francisco, CA, USA.

162.  Timothy Eales, Igor P. Marko, Seyed A. Ghetmiri, Wei Du, Yiyin Zhou, Shui-Qing Yu, Stefan Schulz, Eoin P. O’Reilly, and Stephen J. Sweeney, “GeSn Alloys for Mid-infrared Optoelectronics”, the 13th International Conference on Mid-Infrared Optoelectronics: Materials and Devices, Beijing, China, September 18-22 (2016).

161.  Bader Alharthi, Aboozar Mosleh, Joe Margetis, Sattar Al-Kabi, Seyed Amir Ghetmiri, Houng Tran, Wei Du, Mourad Benamara, Mansour Mortazavi, John Tolle, Hameed Naseem, Shui-Qing Yu, “CVD growth of SiGeSn Alloys for Higher Efficiency Multi-Junction Solar Cells”, the 43rd IEEE Photovoltaic Specialists Conference, Portland, OR, USA, June 5-10 (2016).

160.  Huong Tran, Thach Pham, Yiyin Zhou, Seyed Ghetmiri, Sattar Al-Kabi, Aboozar Mosleh, Hameed Naseem, Shui-Qing Yu, John Tolle, Joe Margetis, Wei Du, Mansour Mortazavi, Richard Soref, Greg Sun, and Baohua Li, “Investigation of Si-based Ge0.93Sn0.07 Photoconductors towards Short-wave Infrared Detection”, IEEE Summer Topicals Meetings, Newport Beach, CA, USA, July 11-13 (2016).

159.  Wei Dou, Seyed Amir Ghetmiri, Sattar Al-Kabi, Aboozar Mosleh, Wei Du, Greg Sun, Richard Soref, John Tolle, Joe Margetis, Baohua Li, Mansour Mortazavi, Hameed Naseem, Shui-Qing Yu, CVD Grown Pseudomorphic GeSn/GeSn and SiGeSn/GeSn Single Quantum Wells, the 58th Electronic Materials Conference, Newark, DE, USA, June 22-24 (2016).

158.  Sattar Al-Kabia, Seyed Amir Ghetmiria, Joe Margetisb, Aboozar Mosleha, Wei Dou, Wei Du,  Greg Sun, Richard Soref, John Tolle, Baohua Li, Mansour Mortazavi, Hameed A. Naseem,  Shui-Qing, Yu, High Quality CVD Grown Thick GeSn Samples with Enhanced Photoluminescence Intensity, the 58th Electronic Materials Conference, Newark, DE, USA, June 22-24 (2016).

157.  Yiyin Zhou, Wei Du, Wei Dou, Thach Pham, Aboozar Mosleh, Seyed Amir Ghetmiri,  Sattar Al-Kabi, Joe Margetis, John Toll,4Greg Sun, Richard Soref, Baohua Li, Mansour Mortazavi, Hameed Naseem, and Shui-Qing Yu, “Systematic Study of Si based Ge_0.9Sn_0.1 Light-Emitting Diode towards Mid-Infrared Application”, the Conference On Lasers and Electrooptics (CLEO), No. JW2A.127, San Jose, CA, USA, June 5-10 (2016).

156.  Thach Pham, Wei Du, Huong Tran, Joe Margetis, John Tolle, Greg Sun, Richard A. Soref, Hameed A. Naseem, Baohua Li, Mansour Mortazavi, and Shui-Qing Yu, “Systematic study of Si-based Ge/Ge_0.9Sn_0.1/Ge photodiodes with 2.6 µm detector cutoff”, the Conference On Lasers and Electrooptics (CLEO), No. STh1G.7, San Jose, CA, USA, June 5-10 (2016).

155.  Wei Du, Seyed Ghetmiri, Sattar Al-Kabi, Aboozar Mosleh, Joe Margetis, John Tolle, Greg Sun, Richard A. Soref, Baohua Li, Hameed A. Naseem, Shui-Qing Yu, and Mansour Mortazavi, “Optical study of Ge_0.95Sn_0.05/Ge_0.9Sn_0.1/Ge_0.95Sn_0.05 quantum well towards group-IV based light source on Si”, the Conference On Lasers and Electrooptics (CLEO), No. SF1P.4, San Jose, CA, USA, June 5-10 (2016).

154.  Mosleh, M. Alher, L. Cousar, H. Abu-safe, W. Dou, P. C. Grant, S. Al- Kabi,, S.A. Ghetmiri, B. Alharthi, H. Tran, W. Du, M. Benamara, B. Li ,M. Mortazavi, S.-Q. Yu, and H. Naseem, Enhancement of Material Quality of (Si)GeSn Films Grown By SnCl₄ Precursor, 2015 ECS fall (228^th meeting), October 11-16, Phoenix, AZ (2015).

153. M. Alher, A.Mosleh, L. Cousar, W. Dou, P. C. Grant, S.A. Ghetmiri, S. Al-Kabi, W. Du, M. Benamara, B. Li, M. Mortazavi, S.-Q. Yu, and H. A. Naseem, CMOS Compatible Growth of High Quality Ge, SiGe and SiGeSn for Photonic Device Applications, 2015 ECS fall (228^th meeting), October 11-16, Phoenix, AZ (2015).

152.  Seyed Amir Ghetmiri, Wei Du, Yiyin Zhou, Joe Margetis, Thach Pham, Aboozar Mosleh, Benjamin R. Conley, Greg Sun, Richard Soref, John Tolle, Hameed A. Naseem, Baohua Li, and Shui-Qing Yu, Temperature-dependent characterization of Ge_0.94Sn_0.06 Light-Emitting Diode grown on Si via CVD, the Conference On Lasers and Electrooptics (CLEO) 2015, ATu1J.6, May 10-15, 2015, San Jose, CA, USA.

151.  Thach Pham, Benjamin R. Conley, Joe Margetis, Huong Tran, Seyed Amir Ghetmiri, Aboozar Mosleh, Wei Du, Greg Sun, Richard A Soref, John Tolle, Hameed A. Naseem, Baohua Li, and Shui-Qing Yu, Enhanced responsivity up to 2.85 A/W of Si-based Ge_0.9Sn_0.1 photoconductors by integration of interdigitated electrodes, the Conference On Lasers and Electrooptics (CLEO) 2015, STh1I.7, May 10-15, 2015, San Jose, CA, USA.

150.  Aboozar Mosleh, Murtadha Alher, Wei Du, Larry C. Cousar, Seyed Amir Ghetmiri, Sattar Al-Kabi, Wei Dou, Perry C. Grant, Benjamin R. Conley, Greg Sun, Richard A. Soref, Baohua Li, Hameed A. Naseem, and Shui-Qing Yu, Growth and characterization of buffer-free SiGeSn epitaxial layers on Si for photonic applications, 2015 Electronic Material Conference, June 24~26, Columbus, OH (2015).

149.  Sattar Al-Kabi, Seyed Amir Ghetmiri, Wei Du, Huong Tran, Greg Sun, Richard Soref, John Tolle, Joe Margetis, Baohua Li, Hameed A. Naseem, and  Shui-Qing Yu, Material and Optical Characterizations for Both Bulk and NIP Double Heterostructure of Germanium Tin, 2015 Electronic Material Conference, June 24~26, Columbus, OH (2015).

147.  Thach Pham, Wei Du, Joe Margetis, Seyed Amir Ghetmiri, Aboozar Mosleh, Greg Sun, Richard A Soref, John Tolle, Hameed A. Naseem, Baohua Li, and Shui-Qing Yu, Temperature-dependent study of Si-based GeSn photoconductors, SPIE Photonics West, No. 9367-27, February 7-12, 2015, San Francisco, CA, USA.

146.  Study the optical constants of Ge_1-xSn_x thin films and plasmonic structure of gold nanotoroids, Huong Tran, Seyed Amir Ghetmiri, Liang Huang, Lucas Domulevicz, Aboozar Mosleh, Benjamin Conley, Wei Du, Hameed Naseem, and Shui-Qing Yu, In Arkansas ASSET II NSF EPSCoR project review meeting, Little Rock, AR (2014).

145.  Yiyin Zhou, Seyed Amir Ghetmiri, Aboozar Mosleh, Benjamin R. Conley, Hameed A. Naseem, Shui-Qing Yu, Room temperature electroluminescence of Ge/Ge_1-xSn_x/Ge p-i-n double heterojunction light-emitting diodes, In Arkansas ASSET II NSF EPSCoR project review meeting, Little Rock, AR (2014).

144.  Sattar Alkabi, Seyed Amir Ghetmiri, Benjamin Conley, Aboozar Mosleh, Wei Du, Hameed Naseem, and Shui-Qing Yu, Photoluminescence measurement and bandgap study of heavily n-doped Ge_1-xSn_x thin films grown on Si, Fabrication of nanostructures and their application on GeSn photodetectors, In Arkansas ASSET II NSF EPSCoR project review meeting, Little Rock, AR (2014).

143.  Thach Pham, Benjamin R. Conley, Liang Huang, Seyed Amir Ghetmiri, Aboozar Mosleh, Wei Du, Hameed A. Naseem, and Shui-Qing Yu, Fabrication of nanostructures and their application on GeSn photodetectors, In Arkansas ASSET II NSF EPSCoR project review meeting, Little Rock, AR (2014).

142. Aboozar Mosleh, Murtadha Alher, Larry C. Cousar, Joshua M. Grant, Seyed Amir Ghetmiri, Benjamin R. Conley, Wei Du, Richard A. Soref, Greg Sun, S.-Q. Yu, Hameed A. Naseem, Low temperature growth and characterization of Ge and GeSn deposition on Si substrate using an ultra-high vacuum chemical vapor deposition system, In Arkansas ASSET II NSF EPSCoR project review meeting, Little Rock, AR (2014).

141.  Perry C. Grant, Wei Dou, Dongsheng Fan, Yuriy I. Mazur, Vitaliy Dorogan, Shui-Qing Yu, Gregory J. Salamo, Band offsets in GaAs_1-xBi_x (0<x<3.6%) Grown by Molecular Beam Epitaxy, 18^th International MBE conference, Flagstaff, Arizona (2014).

140.  Thach Pham, Benjamin R. Conley, Liang Huang, Wei Du, Richard A Soref, Greg Sun, Joe Margetis, John Tolle, Hameed A. Naseem, and Shui-Qing Yu, Enhanced responsivity by integration of interdigitated electrodes on Ge_0.93Sn_0.07 infrared photodetectors, IEEE Photonics Conference, San Diego  (2014).

139.  Yiyin Zhou, Wei Du, Seyed Amir Ghetmiri, Aboozar Mosleh, Amjad Nazzal, Richard A Soref, Greg Sun, Joe Margetis, John Tolle, Hameed A. Naseem, and Shui-Qing Yu, Room-temperature electroluminescence from Ge/Ge_0.92Sn_0.08/Ge double heterostructure LED on Si, IEEE Photonics Conference, San Diego (2014).

138.  Aboozar Mosleh, Seyed Amir Ghetmiri, Benjamin R. Conley, Wei Du, John Tolle, Shui-Qing Yu, and Hameed A. Naseem, Strain Relaxation and Material Quality Improvement of Compressively Strained GeSn Epitaxial Films Through Cyclic Rapid Thermal Annealing Process, submitted to IEEE Summer Topicals Meeting Series, Montreal (2014).

137.  Benjamin R. Conley, Aboozar Mosleh, Seyed A. Ghetmiri, Wei Du, John Tolle, Joe Margetis, Richard A. Soref, Greg Sun, Hameed Naseem, and Shui-Qing Yu, Temperature Dependent Spectral Response and Responsivity of GeSn Photoconductor on Si, IEEE Summer Topicals Meeting Series, Montreal (2014).

136.  Wei Du, Seyed Amir Ghetmiri, Aboozar Mosleh, Benjamin R. Conley, Liang Huang, Amjad Nazzal, Richard A. Soref3 Greg Sun, John Tolle, Joe Margetis, Hameed A. Naseem, and Shui-Qing Yu, Direct transition Ge_0.94Sn_0.06 PIN-diode double heterostructure light emitter at high injection, submitted to the 11th International Conference on Group IV Photonics, Paris (2014).

135.  Benjamin R. Conley, Yiyin Zhou, Aboozar Mosleh, Seyed Amir Ghetmiri, Wei Du, Richard A Soref, Greg Sun, Joe Margetis, John Tolle, Hameed A. Naseem, and Shui-Qing Yu, Infrared spectral response of a GeSn p-i-n photodiode on Si, in the 11th International Conference on Group IV Photonics, Paris (2014)

134.  Aboozar Mosleh, Seyed Amir Ghetmiri, Benjamin R. Conley, Husam Abu-Safe, Zafar Waqar, Mourad Benamara, Samir El-Ghazaly, Shui-Qing Yu, Hameed A. Naseem, Investigation of growth mechanism and role of H₂ in very low temperature Si epitaxy, in the 226th ECS Fall Meetings, 2014.

133.  A.Mosleh, M. Benamara, S.A. Ghetmiri, B. Conley, W. Du, J. Tolle, S.-Q. Yu, H. Naseem, Investigation of defect formation and propagation in GeSn thin films, in the 226th ECS Fall Meetings, 2014

132.  Benjamin R. Conley, Aboozar Mosleh, Seyed Amir Ghetmiri, Wei Du, Greg Sun, Richard Soref, John Tolle, Joe Margetis, Hameed A. Naseem, and Shui-Qing Yu, Stability of pseudomorphic and compressively strained GeSn thin films under rapid thermal annealing, in the 226th ECS Fall Meetings, 2014.

131.  John Tolle, Joe Margetis, Seyed A. Ghetmiri, Aboozar Mosleh, Benjamin R. Conley, Wei Du, Amjad Nazzal, Richard A. Soref, Greg Sun, Hameed A. Naseem and Shui-Qing Yu, Growth and characterization of Ge_1-xSn_x alloys deposited using a commercial CVD system, in the 226th ECS Fall Meetings, 2014.

130.  Wei Du, Seyed Amir Ghetmiri, Aboozar Mosleh, Benjamin R. Conley, Liang Huang, Amjad Nazzal,   Richard A Soref, Greg Sun, John Tolle, Hameed A. Naseem, and Shui-Qing Yu, Investigation of Photoluminescence from Ge_1-xSn_x: A CMOS-Compatible Material Grown on Si via CVD, the Conference On Lasers and Electrooptics (CLEO), No. JW2A.57, San Jose, CA, USA, June 8-13, 2014.

129.  Benjamin R. Conley, Liang Huang, Seyed Amir Ghetmiri, Aboozar Mosleh, Wei Du, Greg Sun, Richard Soref, John Tolle, Hameed A. Naseem, and Shui-Qing Yu, Extended Infrared Absorption to 2.2 µm with Ge_1-xSn_x Photodetectors Grown on Silicon, the Conference On Lasers and Electrooptics (CLEO), No. SM2H.5, San Jose, CA, USA, June 8-13, 2014.

128 . Seyed Amir Ghetmiri, Benjamin R. Conley, Aboozar Mosleh, Liang Huang, Wei Du, Amjad Nazzal, Greg Sun, Richard Soref, John Tolle, Hameed A. Naseem, and Shui-Qing Yu, Photoluminescence from GeSn/Ge Heterostructure Microdisks with 6% Sn Grown on Si via CVD, the Conference On Lasers and Electrooptics (CLEO), No. AW1H.2, San Jose, CA, USA, June 8-13, 2014.

127.  Shui-Qing Yu, Electron Beam Lithography for Nanoplasmonics Solar cells and Next Generation Multi-junction Solar Cells Using SiGeSn Alloys, In Arkansas ASSET II NSF EPSCoR project review meeting, Little Rock, AR (2013).

126.  Thach Pham, Liang Huang, Seyed Amir Ghetmiri, Jingbiao Cui, Hameed Naseem, Shui-Qing Yu, Fabrication of metallic nanostructures and single nanowire devices, In Arkansas ASSET II NSF EPSCoR project review meeting, Little Rock, AR (2013).

125. Liang Huang, Huixu Deng, Thach Pham, Matthew Young, Hameed Naseem, Husam Hamza Abu-Safe, Xiaodong Yang, Shui-Qing Yu, Amorphous silicon solar cells using metallic fishnet nanostructures simultaneously for Schottky contact and plasmonics enhancement, In Arkansas ASSET II NSF EPSCoR project review meeting, Little Rock, AR (2013)

124.  L. Cousar, M.G. Young, S. Shumate, H. Mohammed, S.-Q. Yu, H. Naseem, Low cost Al screen printed high efficiency thin silicon p+/n solar cells, In Arkansas ASSET II NSF EPSCoR project review meeting, Little Rock, AR (2013).

123.  Benjamin R. Conley, Aboozar Mosleh, Seyed Amir Ghetmiri, Hameed A. Naseem, John Tolle, Shui-Qing Yu, CVD growth of Ge_1-xSn_x using large scale Si process for higher efficient multi-junction solar cells, In Arkansas ASSET II NSF EPSCoR project review meeting, Little Rock, AR (2013).

122.  Benjamin Conley, Aboozar Mosleh, Seyed Amir Ghetmiri, Yiyin Zhou, Hameed Naseem and Shui-Qing Yu, Characterization of GeSn for Si-based optoelectronic devices, In Arkansas ASSET II NSF EPSCoR project review meeting, Little Rock, AR (2013).

121.  Aboozar Mosleh, Seyed Amir Ghetmiri, Benjamin R. Conley, Husam Abu-Safe, Zafar Waqar,  Mourad Benamara, Shui-Qing Yu, Hameed A. Naseem, Nucleation-Step study of silicon homoepitaxy for low-temperature fabrication of Si solar cells, In Arkansas ASSET II NSF EPSCoR project review meeting, Little Rock, AR (2013).

120.  Asanka Munasinghe, Husam Abu-Safe, Shui-Qing Yu, Hameed A Naseem, Hydrogenated Nanocrystalline silicon using PECVD, In Arkansas ASSET II NSF EPSCoR project review meeting, Little Rock, AR (2013).

119.  Matthew G. Young, Benjamin Newton, Mourad Benamara, Husam Abu-Safe, Shui-Qing Yu, Hameed Naseem, Fabrication of Si Nanoroot/a-Si composite films using physical vapor deposited Al nanodots, In Arkansas ASSET II NSF EPSCoR project review meeting, Little Rock, AR (2013).

118.  Seth Shumate, Matthew G. Young, Hafeezuddin M. Khaja, Douglas Hutchings, Larry Cousar, Shui-Qing Yu, and Hameed Naseem, Progress on the hydrogen selective emitter for N-type solar cells, In Arkansas ASSET II NSF EPSCoR project review meeting, Little Rock, AR (2013).

117.  Husam Abu-Safe, Alan Hickson, Hui Zhong, Hameed Naseem, Shui-Qing Yu, Selected area crystallization of amorphous Si and Ge thin films on glass substrates for solar cell and 3D-optoelectronic applications, In Arkansas ASSET II NSF EPSCoR project review meeting, Little Rock, AR (2013).

116.  Perry C. Grant, Dongsheng Fan, Aboozar Mosleh, Vitaliy G. Dorogan, Michael E. Hawkridge, Yuriy I. Mazur, Mourad Benamara, Shui-Qing Yu, Gregory J. Salamo, Photoluminescence Studies of the Effects of Rapid Thermal Annealing on Molecular Beam Epitaxy Grown GaAs_1-xBi_x/GaAs Heterostructures, 30th North American Molecular Beam Epitaxy Conference (NAMBE), Banff, Alberta, (October 5-11, 2013).

115.  Yu. I. Mazur, V. G. Dorogan, L. D. de Souza, D. Fan, M. Benamara, M. Schmidbauer, M. E. Ware, G. G. Tarasov, S.-Q. Yu, G. E. Marques, and G. J. Salamo, Effect of AlGaAs cladding on the luminescent properties of GaAs/GaAs_1-xBi_x/GaAs heterostructures, 4th International Workshop on Bismuth-Containing Semiconductors (4th BCS), Fayetteville, AR, USA (July14-17, 2013). 

114.  Chen Li, Zhaoquan Zeng, Dongsheng Fan, Yusuke Hirono, Jiang Wu, Timothy A. Morgan, Xian Hu, Shuiqing Yu, Zhiming M. Wang, and Gregory J. Salamo, Nanostructures induced by bismuth nano-droplets using molecular beam epitaxy, 4th International Workshop on Bismuth-Containing Semiconductors (4th BCS), Fayetteville, AR, USA (July14-17, 2013)

113.  P.C. Grant, D. Fan, A. Mosleh, M. Hawkridge, Y. Mazur, M. Benemara, V. Dorogan, S.-Q. Yu, G. Salamo, Investigation of Rapid Thermal Annealing on GaAs1-xBix/GaAs Heterostructures, 4th International Workshop on Bismuth-Containing Semiconductors (4th BCS), Fayetteville, AR, USA (July14-17, 2013). 

112.  Shui-Qing Yu, Electron Beam Lithography for Nano Patterning and Characterization of Photovoltaic Devices, In Arkansas ASSET II NSF EPSCoR project strategic plan meeting,  Mountain Magazine, AR (2013). 

111.  Aboozar Mosleh, Seyed Amir Ghetmiri, Benjamin R. Conley, Shui-Qing Yu, Hameed A. Naseem, Mourad Benamara, John Tolle, Strain Engineering of high quality CVD grown GeSn films for optoelectronic devices, Notre Dame, IN, EMC conference (2013). 

110.  Liang Huang, Huixu Deng, Thach Pham, Matthew Young, Hameed Naseem, Husam Hamza Abu-Safe, Xiaodong Yang, Shui-Qing Yu, Amorphous Silicon Solar Cells Using Metallic Fishnet Nanostructures Simultaneously for Schottky Contact and Plasmonics Enhancement EBL, IEEE PVSC Conference, Tampa, FL (2013).

109.  B. R. Conley, A. Mosleh, S. Ghetmiri, H A. Naseem, J. Tolle, S.-Q Yu, CVD Growth of Ge_1-xSn_x Using Large Scale Si Process for Higher Efficient Multi-Junction Solar Cells, IEEE PVSC Conference, Tampa, FL (2013).

108. A. Mosleh, Z. Waqar, S.-Q  Yu, H. Abu-Safe, S. Ghetmiri, B. R. M. Benamara, H. A. Naseem, Nucleation-step study of silicon homoepitaxy for low-temperature fabrication of solar cells, IEEE PVSC Conference, Tampa, FL (2013).

107.  Husam Abu-Safe, Alan Hickerson, Hameed Naseem, and Shui-Qing Yu, Selected Area Crystallization of Amorphous Si and Ge Thin Films on Glass Substrates for Solar Cell and 3D-Optoelectronic Applications, IEEE PVSC Conference, Tampa, FL (2013)

106.  Matthew Young, Benjamin Newton, Husam Abu-Safe, Shui-Qing Yu, Hameed Naseem, Fabrication of Al Nanodots by Electron Beam Evaporation, IEEE PVSC Conference, Tampa, FL (2013).

105. Seth Shumate, Matthew G. Young, Hafeezuddin M. Khaja, Douglas Hutchings, Larry Cousar, Shui-Qing Yu, and Hameed Naseem, Progress on the Hydrogen Selective Emitter for N-type solar cells, IEEE PVSC Conference, Tampa, FL (2013).

104.  Seth Shumate, Hafeezuddin M. Khaja, Douglas Hutchings, Shui-Qing Yu, and Hameed Naseem, Top-down Aluminum Induced Crystallization for N-type Solar Cell, IEEE PVSC Conference, Tampa, FL (2013).

103.  Shui-Qing Yu, Electron Beam Lithography for Nano Patterning and Characterization of Photovoltaic Devices, In Arkansas ASSET II NSF EPSCoR project annual meeting, Springdale, AR (2012).

102.  Liang Huang, Thach Pham, Husam Hamza Abu-Safe, Matthew Young, Seth Shumate, Benjamin Newton, Hameed Naseem and Shui-Qing Yu, Fabrication and characterization of optoelectronic devices integrated with nanostructures, In Arkansas ASSET II NSF EPSCoR project annual meeting, Springdale, AR (2012).

101.  H. Abu-Safe, A. Hickrson, S. Shumate, H. Tran, B. Conley, A. Nazzal, B. Hankton, A. Ghetmiri, S.Q. Yu, and H. Naseem, Fabrication and characterization of germanium, silicon and Graphene thin films for advanced photovoltaic and optoelectronic devices, In Arkansas ASSET II NSF EPSCoR project annual meeting, Springdale, AR (2012).

100.  M.G. Young, S. Shumate, B. Newton, H. Mohammed, L. Cousar, M. Zaman, A. Munansinghe, H. Abu-Safe, S. Q. Yu,  H. Naseem, Thin Film Silicon Solar Cells Compatible with Low Temperature Processing, In Arkansas ASSET II NSF EPSCoR project annual meeting, Springdale, AR (2012).

99.  Dongsheng Fan, Perry C. Grant, Shui-Qing Yu, Shane R. Johnson, Zhiming M. Wang, Gregory J. Salamo, High Performance Near-infrared and Mid-infrared Optoelectronic Devices for Bioscience Applications, ABI fall research symposium, Fayetteville, AR (2012).

98.  Liang Huang, Thach Pham, Matthew Young, Hameed Naseem, Shui-Qing Yu, Nanofabrication of ordered semiconductor and metallic structures by electron beam lithography, ABI fall research symposium, Fayetteville, AR (2012).

97.  Benjamin R. Conley, Hameed Naseem, Greg Sun, Paul Sharps, Shui-Qing Yu, High Efficiency MJ Solar Cells and TPV Using SiGeSn Materials, IEEE PVSC Conference, Austin, TX, USA (2012). 

96.  B. Newton, Husam, Abu Safe H, M, Benemara, S.-Q. Yu, H. Naseem, Fabrication of Site Specific Amorphous/NanoCrystalline Silicon Composite Thin Film for Solar Cells, IEEE PVSC Conference, Austin, TX, USA (2012). 

95.  Liang Huang, Husam Hamza Abu-Safe, Matthew Young, Seth Shumate, Benjamin Newton, Hameed Naseem and Shui-Qing Yu, Fabrication and Characterization of c-Si Solar Cells Integrated with Ordered Metallic Nanostructure Arrays, IEEE PVSC Conference, Austin, TX, USA (2012). 

94.  M.G Young, M. Benamara, H. Abu-Safe, S.-Q. Yu, H.A. Naseem, a-Si:H/c-Si Nanocomposite Material for Solar Cells Fabricated from PECVD, IEEE PVSC Conference, Austin, TX, USA (2012). 

93.  SD Shumate, D.A. Hutchings, M. K. Hafeezuddin, G. Beilke, B. Newton, M. Young, H. Abu-Safe, S.-Q. Yu, H. Naseem, SELF ALIGNED HYDROGENATED SELECTIVE EMITTER FOR N-TYPE SOLAR CELLS, IEEE PVSC Conference, Austin, TX, USA (2012). 

92 . Asmaa Elkadi, Emmanuel Decrossas, Shui-Qing Yu, Hameed Naseem and Samir M. El-Ghazaly, Controlling the Band Gap of Aligned Semiconducting Single-Walled Carbon Nanotubes for THz Modulator, in Proceeding of 2012 European Microwave Week

91.  Dongsheng Fan, Zhaoquan Zeng, Xian Hu, Vitaliy G. Dorogan, Yusuke Hirono, Chen Li, P. C. Grant, Mourad Benamara, Mike Hawkridge, Yuriy I. Mazur, Shui-Qing Yu, Shane R. Johnson, Zhiming M. Wang, Gregory J. Salamo, High Optical Quality GaAsBi/GaAs/AlGaAs Separate Confinement Heterostructures, 17th International Conference on Molecular Beam Epitaxy (MBE 2012), Nara, Japan (September 23-28, 2012),

90.  Hameed Naseem, Shui-Qing Yu, Samir El-Ghazaly, Zafar Waqar, Husam Abu-Safe, Shannen Adcock, Ben Conley, Salman Mosleh, Bryant Hankton, Asanka Munasinghe, Safety Considerations in Building Ultra-high Vacuum Plasma Enhanced Chemical Vapor Deposition System for Low Temperature Group IV Epitaxy, University Government Industry Micro Nano Symposium, Berkeley, CA  (2012). 

89.  S. Shumate, M. Young, B. Newton, E. Porter, S-Q. Yu, H. Naseem, Hands-on training in the design and fabrication of N-type solar cells, University Government Industry Micro Nano Symposium, Berkeley, CA (2012). 

88.  D. Fan, , Z. Zeng, X. Hu, V. G. Dorogan, Y. Hirono, C. Li, P. C. Grant, M. Benamara, M. E. Hawkridge, Yu, I. Mazur, S.-Q. Yu, S. R. Johnson, Zh. M. Wang, and G. J. Salamo, Molecular Beam Epitaxy Growth of GaAsBi/GaAs/AlGaAs Separate Confinement Heterostructures, 3rd International Workshop on Bismuth-Containing Semiconductors (3rd BCS), Victoria B.C., Canada (July15-18, 2012),

87.  D. Fan, , P. C. Grant, Z. Zeng, X. Hu, C. Li, V. G. Dorogan, M. E. Hawkridge, Yu, I. Mazur, S.-Q. Yu, S. R. Johnson, Zh. M. Wang, and G. J. Salamo, GaAsBi/GaAs Multiple Quantum Wells Grown by Molecular Beam Epitaxy, 29th North American Molecular Beam Epitaxy Conference (NAMBE), Atlanta, GA (October 14-17, 2012). 

86.  Mohammad Ali Khorrami, Samir El-Ghazaly, Shui-Qing Yu, Hammed Naseem, Active Terahertz Surface Plasmon Switch inside the Two Dimensional Electron Gas of a Hetero-structure, IMS 2012. 

85.  Zhaoquan Zeng, Chen Li, Dongsheng Fan, Yusuke Hirono, Timothy A. Morgan, Xian Hu, Jian Wang, Joon Sue Lee, Zhiming M. Wang, Shui-Qing Yu, Aqiang Guo, Gregory J. Salamo, Fabrication of Bi₂Te₃ Nanodots by Droplet Epitaxy on GaAs substrates, APS Annual Meeting, Dallas, TX (2012).

84.  Dongsheng Fan, Jiang Wu, Zhiming M. Wang, Shui-Qing Yu, Gregory J. Salamo, InAs QD light emitting diodes on in-situ nano-patterned substrates using Molecular Beam Epitaxy, SPIE Photonic West, San Francisco, CA (2012).

83.  Dongsheng Fan, Zhaoquan Zeng, Zhiming M. Wang, Shane R. Johnson, Shui-Qing Yu, Gregory J. Salamo, Molecular Beam Epitaxy Grown GaInAsSbBi alloys on GaSb substrates for mid-infrared laser diode applications, SPIE Photonic West, San Francisco, CA (2012).

82.  S. Shumate, M. K. Hafeezuddin, Shui-Qing Yu, H. A. Naseem, Microstructural Influence of Hydrogenated Amorphous Silicon on Polycrystalline Emitter Solar Cells Prepared by Top-Down Aluminum Induced Crystallization, In Arkansas ASSET II NSF EPSCoR project annual meeting, Heber Springs, AR (2011). 

81.  Liming Ji, Liang Huang, Hameed Naseem, Shui-Qing Yu, Vasundara Varadan, Ellipsometric characterization of metamaterial nanostructures on semiconductor substrates for solar cell applications, In Arkansas ASSET II NSF EPSCoR project annual meeting, Heber Springs, AR (2011). 

80.  Matthew Young, Benjamin Newton, Husam Abu-Safe, Hameed Naseem, Shui-Qing Yu, 3D Nanostructured Crystalline Silicon/Amorphous Silicon Heterojunction Solar Cells, In Arkansas ASSET II NSF EPSCoR project annual meeting, Heber Springs, AR (2011). 

79.  S.-Q. Yu, Fabricate and characterize photovoltaic devices with integrated optical metamaterials for enhanced performance, In Arkansas ASSET II NSF EPSCoR project annual meeting, Heber Springs, AR (2011). 

78.  Liang Huang, Emmanuel Decrossas, Benjamin Newton, Liming Ji, Hameed Naseem, Vasundara Varadan, Shui-Qing Yu, Nanofabrication of integrated metamaterials and semiconductors for optoelectronic devices, In Arkansas ASSET II NSF EPSCoR project annual meeting, Heber Springs, AR (2011). 

77.  Zhaoquan Zeng, Dongsheng Fan, Chen Li, Yusuke Hirono, Timothy A. Morgan, Xian Hu, Jian Wang, Joon Sue Lee, Shane R. Johnson, Aqiang Guo, Zhiming M. Wang, Shui-Qing Yu, and Gregory J. Salamo, MBE grown III-V-Bi nanostructures and topological insulators, in International workshop on 6.1 Å II-VI and III-V materials and their integration, Phoenix (2011). 

76.  Benjamin Conley, Shannen Adcock, Aboozar Mosleh, Bryant Hankton, Zafar Waqar, Husam Abu-Safe, Hameed Naseem, and Shui-Qing Yu, Low Temperature Growth of Ge and SiGeSn epitaxial Films growth from UHV-PE-CVD Reactor, in International workshop on 6.1 Å II-VI and III-V materials and their integration, Phoenix (2011).   

75.  Dongsheng Fan, Zhaoquan Zeng, Vitaliy G. Dorogan, Yusuke Hirono, Chen Li, Yuriy I. Mazur, Zhiming M. Wang, Shane R. Johnson, Shui-Qing Yu, Gregory J. Salamo, Photoluminescence and Surface Morphology Characterization of GaAsBi Grown on GaAs, in 28th North American Molecular Beam Epitaxy Conference, San Diego, CA (2011). 

74.  Zhaoquan Zeng, Dongsheng Fan, Chen Li, Yusuke Hirono, Timonthy A. Morgan, Zhiming M. Wang, Shui-Qing Yu, Aqiang Guo, Gregory J. Salamo, Epitaxial Growth of High-quality Bi₂Te₃ and Sb₂Te₃ Thin Films on GaAs (111), MRS fall meeting, Boston, MA (2011). 

73.  Dongsheng Fan, Zhaoquan Zeng, Vitaliy G. Dorogan, Yusuke Hirono, Chen Li, Yuriy I. Mazur Zhiming M. Wang, Shane R. Johnson, Shui-Qing Yu, Gregory J. Salamo, Bismuth surfactant mediated growth of InAs quantum dots by Molecular Beam Epitaxy, MRS fall meeting, Boston, MA (2011). 

72.  A. Guo, C. Furrow, Vas. P. Kunets, S.-Q. Yu, G. Salamo, G. A. Sivologlou, R. El-Ganainy, K. G. Markris, D. N. Christodoulids, D. Duchesne, R. Morandotti, M. Volatier-Ravat, V. Aimez, Observation of a Passive PT Phase Transition, in APS MARCH MEETING 2011, MAR11-2010-000974, session Y45, (Atom Interactions with Molecules, Surfaces, and X-Rays). 

71.  D. Fan, S.-Q. Yu, Z.M. Wang, S.R. Johnson and G. J. Salamo, Novel GaInAsSbBi Materials for Mid-Infrared Type-I Quantum Well Lasers, The Second International Workshop on Bismuth-Containing Semiconductors: Theory, Simulation and Experiment, Guildford, UK (July 18-20, 2011).  

70.  N. Hossain, K. Hild, S. R. Jin, S. J. Sweeney, S.-Q. Yu, S. R. Johnson, D. Ding, and Y. H. Zhang, Temperature Dependence and Physical Properties of GaAsSb/GaAs QW Lasers, Photonics West, San Francsico, CA, USA (2011).

69.  Newton, B., H.K. Mohammed, H. Abu-Safe, S.-Q. Yu, H.A. Naseem, Fabrication of Aluminum Nanodot Assisted Growth of Nanoroots for Application in Amorphous/Crystalline Silicon Composite Thin Film Solar Cells, International Conference on Metallurgical Coatings and Thin Films (2010). 

68. S.-Q. Yu, Research Highlights and Proposed Research from Applied Nano & Bio Photonics Group, a presentation given in Arkansas NSF EPSCoR Annual Conference, Little Rock (Oct, 2010).

67.  Hossain, N., K. Hild, S. R. Jin, S. J. Sweeney, S-Q. Yu, S. R. Johnson, D. Ding, and Y. H. Zhang, Role of growth temperature on the physical characteristics of GaAsSb/GaAs QW lasers, Proceedings of IEEE Photonics Society 23^rd Annual Meeting, Denver, USA (2010).

66.  N. Hossain, K. Hild, S. J. Sweeney, S.-Q. Yu, S. R. Johnson, D. Ding, and Y. H. Zhang, Influence of Device Structures on Carrier Recombination in GaAsSb/GaAs QW Lasers, Photonics Global Conference Singapore (2010).

65.  N. Hossain, S. R. Jin, S. J. Sweeney, S.-Q. Yu, S. R. Johnson, D. Ding, and Y. H. Zhang, Improved Performance of GaAsSb/GaAs SQW Lasers, SPIE Photonic West, San Francisco, CA (Jan 26-28, 2010).

64.  D. Ding, S. R. Johnson, S.-N. Wu, S.-Q. Yu, Y.-H. Zhang, A practical guide to photovoltaic solar cell design, SPIE Photonic West, San Francisco, CA (Jan 26-28, 2010).

63.  S.-N. Wu, S.-Q. Yu, S. R. Johnson, D. Ding, Y.-H. Zhang, Ultrahigh extraction efficiency of a semiconductor hemisphere for LED applications, SPIE Photonic West, San Francisco, CA (Jan 26-28, 2010).

62. Shane R. Johnson, Rajesh Atluri, Ding Ding, Shui-Qing Yu, Yong-Hang Zhang, Nonradiative Losses and Cooling Performance in Semiconductor Based Luminescence Refrigerators, SPIE Photonics West (2009).

61.  D. Ding, S.-N. Wu, S. Wang, S. R. Johnson, S.-Q. Yu, X. Liu, J. K. Furdyna, and Y.-H. Zhang, Multi-junction Solar Cells Based on the Integration of II/VI and III/V Semiconductors, IEEE LEOS Annual Meeting (2008).

60.  S. J. Sweeney, K. Hild, I. P. Marko, S.-Q. Yu, S. R. Johnson and Y.-H. Zhang, Thermal Characteristics of 1.3um GaAsSb/GaAs-based Edge- and Surface-Emitting Lasers, 21st IEEE International Semiconductor Laser Conference, P5, Sorrento, Italy (Sep 2008).

59.  Shumin Wang, Song-Nan Wu, Ding Ding, Xinyu Liu, Xiao-Bo Zhang, Shane R. Johnson, Shui-Qing Yu, Jacek K. Furdyna, David J. Smith, and Yong-Hang Zhang, Multijunction solar cells using monolithically-integrated and lattice-matched II/VI and III/V materials, 23^rd EU PVSEC, 1AO4.1 (Sep, 2008).

58.  Shumin Wang, Song-Nan Wu, Ding Ding, Xinyu Liu, Xiao-Bo Zhang, Shane R. Johnson, Shui-Qing Yu, Jacek K. Furdyna, David J. Smith, and Yong-Hang Zhang, Multijunction solar cells using monolithically-integrated and lattice-matched II/VI and III/V materials, 23^rd EU PVSEC, Spain (Sep, 2008).

57.  S.-N. Wu, S.-Q. Yu, D. Ding, S. R. Johnson, and Y.-H. Zhang, Luminescence coupling in direct-bandgap multi-junction solar cells, SPIE Annual Meeting, Optics and Photonics, San Diego (Aug, 2008).

56.  S. R. Johnson, D. Ding, J.-B. Wang, S.-Q. Yu, Y.-H. Zhang, Measurement and Improvement of Nonradiative Losses in MBE Grown III-V Semiconductors, 26^th North American Conference on Molecular Beam Epitaxy, Vancouver, CA (Aug, 2008).

55.  B. C. Green, S.–Q. Yu, S. J. Sweeney, D. Ding, Y.–H. Zhang, Novel heterostructure design for increased spectral width of superluminescent diodes (SLDs) and dual-wavelength laser diodes, Device Research Conference, Santa Barbara, CA (June, 2008).

54.  Y.-H. Zhang, S.-Q. Yu, S. R. Johnson, D. Ding, S.-N. Wu, S. Wang, X. Liu, J. K. Furdyna, Monolithically integrated multijunction solar cells using II/VI and III/V materials lattice matched to GaSb or InAs substrates, 2008 Space Power Workshop (April, 2008).

53.  S. Wang, X. Liu, D. Ding, S.-N. Wu, S. R. Johnson, S.-Q. Yu, J. K. Furdyna, Y.-H. Zhang, Lattice matched ZnTe and CdZnTe/ZnTe heterostructures grown on GaSb for multijunction solar cell applications, 33rd IEEE Photovoltaic Specialists Conference (San Diego, 2008). 

52.  Y.-H. Zhang, S.-Q. Yu, S. R. Johnson, D. Ding, S.-N. Wu, Monolithically Integrated Multijunction Solar Cells Using II/VI and III/V Materials Lattice Matched to GaSb or InAs Substrates, 33rd IEEE Photovoltaic Specialists Conference (San Diego, 2008).    

51.  D. Ding, S. R. Johnson, J.-B. Wang, S.-Q. Yu, Y.-H. Zhang, Measurement of Spontaneous Emission Quantum Efficiency in InGaAs/GaAs Quantum Wells, Conference on Lasers and Electro-Optics, 2008-CLEO/IQEC.

50.  S.-Q. Yu, Y. Cao, S. R. Johnson, Y.-H. Zhang, Y.-Z. Huang, Equilateral-triangle-resonator mid-infrared laser diodes, Conference on Lasers and Electro-Optics, 2008-CLEO/IQEC. 

49.  H.-X. Liu, S.-Q. Yu, D. Ding, S. R. Johnson, Y.-H. Zhang, Nanosecond Time-Resolved Spectroscopy Measurement for Studies of Semiconductor Electroluminescence Refrigeration, SPIE Photonics West, San Jose, CA (January 2008). 

48.  S.-Q. Yu, D. Ding, N. Rider, J.-B. Wang, S. R. Johnson, Y.-H. Zhang, Fabrication and optimization of high extraction-efficiency semiconductor optical structures for electroluminescence refrigeration, SPIE Photonics West, San Jose, CA (January 2008). 

47.  B. C. Green, S.-Q. Yu, J.-B. Wang, X. Li, Y.-H. Zhang, Broad spectrum superluminescence diodes utilizing internal optical pumping of additional gain regions and separate quasi-Fermi levels, SPIE Photonics West, San Jose, CA (January 2008). 

46.  S.-N. Wu, S.-Q. Yu, D. Ding, S. R. Johnson, Y.-H. Zhang, Impact of photon recycling and spontaneous emission coupling on multi-junction solar cell design, SPIE Photonics West, San Jose, CA (January 2008). 

45. R. Roucka, S.-Q. Yu, J. Tolle, Y.Y. Fang, S.-N. Wu, José Menéndez, and J. Kouvetakis, Photoresponse at 1.55 μm in GeSn epitaxial films grown on, IEEE LEOS Annual Meeting, Orlando FL (October 2007).

44. S.-Q. Yu, N. Rider, D. Ding, J.-B. Wang, S. R. Johnson, Y.-H. Zhang, Light Emitting Diodes with Extremely High Extraction-Efficiency for Electroluminescence Refrigeration, Optical Society of America, Conference on Lasers and Electro Optics/Quantum Electronics and Laser Science Conference, CLEO/QELS 2007, Baltimore MD (May 2007).

43. D. Ding, J.-B. Wang, S. R. Johnson, S.-Q. Yu, Y.-H. Zhang, Determination of Internal Quantum Efficiency in Semiconductors Suitable for Luminescence Refrigeration, Symposium on Nano and Giga Challenges in Electronics and Photonics, NGC2007, Tempe AZ (March 2007).

42. S.-Q. Yu, D. Ding, J.-B. Wang, S. R. Johnson, Y.-H. Zhang, Impact of Electronic Density of States on Electroluminescence Refrigeration, Symposium on Nano and Giga Challenges in Electronics and Photonics, NGC2007, Tempe AZ (March 2007).

41. S R. Johnson, D. Ding, S.-Q. Yu, J.-B. Wang, Y.-H. Zhang, Optimal bandgap energy for optical refrigeration in semiconductors, SPIE Photonics West, San Jose CA (January 2007).

40. N. Rider, S.-Q. Yu, J.-B. Wang, D. Ding, S. R. Johnson, Y.-H. Zhang, Highly Reflective Non-Alloyed Ohmic Contacts on n-type GaAs, SPIE Photonics West, San Jose CA, (January 2007).

39. J.-B. Wang, D. Ding, S.-Q. Yu, S. R. Johnson, Y.-H. Zhang, Determination of internal quantum efficiency in semiconductors suitable for luminescence refrigeration, SPIE Photonics West, San Jose CA (January 2007).

38. S.-Q. Yu, N. Rider, J.-B. Wang, D. Ding, S. R. Johnson, Y.-H. Zhang, High extraction efficiency light emitting diodes for electroluminescence refrigeration, SPIE Photonics West, San Jose CA (January 2007).

37.  S. R. Johnson, J.-B. Wang, D. Ding, S.-Q. Yu and Y.-H. Zhang, Temperature Dependent Measurements of the Nonradiative Coefficients in MBE Grown GaAs/AlGaAs Heterostructures using Excitation Dependent Photoluminescence, 24^th North American Conference on Molecular Beam Epitaxy (2006). 

36.  Y.-H. Zhang, S.-Q. Yu, S. R. Johnson, J.-B. Wang, D. Ding, Latest Progresses in the Study of Electroluminescence Refrigeration, 5^th Annual Workshop on Laser Cooling of Solids, Albuquerque NM (June 2006). 

35.  S. R. Johnson, J.-B. Wang, D. Ding, S.-Q. Yu, Y.-H. Zhang, Performance of semiconductor optical refrigerators in terms of bandgap energy and conversion efficiency, 5^th Annual Workshop on Laser Cooling of Solids, Albuquerque NM (June 2006). 

34.  J.-B. Wang, D. Ding, S. R. Johnson, S.-Q. Yu, Y.-H. Zhang, Determination of internal quantum efficiency in semiconductors suitable for luminescence refrigeration, 5^th Annual Workshop on Laser Cooling of Solids, Albuquerque NM (June 2006). 

33.  S.-Q. Yu, N. Rider, D. Ding, J.-B. Wang, S. R. Johnson, Y.-H. Zhang, A general device platform for semiconductor optical refrigeration, 5^th Annual Workshop on Laser Cooling of Solids, Albuquerque NM (June 2006). 

32.  S. R. Johnson, D. Ding, J.-B. Wang, S.-Q. Yu, and Y.-H. Zhang, Influence of Bandgap and Quantum Efficiency on Optical Refrigeration, International symposium of compound semiconductor, 2006-ISCS, Vancouver, CA. 

31.  D. Ding, S. R. Johnson, J.-B. Wang, S.-Q. Yu, and Y.-H. Zhang, Intrinsic Irreversibility in Light Emission Processes in Semiconductors, International symposium of compound semiconductor, 2006-ISCS, Vancouver, CA. 

30.  S.-Q. Yu, J.-B. Wang, D. Ding, N. Samal, S. R. Johnson, Y.-H. Zhang, Gain-Peak Cavity-Mode Tuning in 1.3 μm GaAsSb VCSELs, International symposium of compound semiconductor, 2006-ISCS, Vancouver, CA. 

29.  S.-Q. Yu, D. Ding, J.-B. Wang, S. R. Johnson, Y.-H. Zhang, Electroluminescence Refrigeration in Semiconductors, Conference on Lasers and Electro-Optics, 2006-CLEO/IQEC. 

28.  S.-Q. Yu, J.-B. Wang, D. Ding, S. R. Johnson, Y.-H. Zhang, Device fabrication and characterization challenges for electroluminescence refrigeration in semiconductors, WOCSEMMAD, Scottsdale, AZ (February, 2006). 

27.  J.-B. Wang, D. Ding, S.-Q. Yu, S. R. Johnson, Y.-H. Zhang, Photon recycling in luminescence refrigeration, WOCSEMMAD, Scottsdale, AZ (February, 2006). 

26.  S.-Q. Yu, D. Ding, R. Gupta, X. Jin, Shane Johnson, J. Gu, Y.-H. Zhang, VCSEL structure embedded in metal heat sink for optimal thermal management, SPIE Photonics West, San Jose CA (January 2006). 

25.  J.-B. Wang, D. Ding, S.-Q. Yu, S. R. Johnson, Y.-H. Zhang, Photoluminescence refrigeration in semiconductors, SPIE Photonics West, San Jose CA (January 2006). 

24.  S.-Q. Yu, D. Ding, J.-B. Wang, S. R. Johnson, D. Vasileska, Y.-H. Zhang, Electroluminescence refrigeration in semiconductor light emission diodes, SPIE Photonics West, San Jose CA (January 2006). 

23. Y. Cao, S.-Q. Yu, S. R. Johnson, Y. H. Zhang, Single mode equal lateral triangle resonant microcavity laser diode at 1.2 µm, SPIE Photonics West, San Jose CA (January 2006).

22.  S.-Q. Yu, X. Jin, S. R. Johnson, Y.-H. Zhang, Gain saturation and carrier distribution effects in molecular beam epitaxy grown GaAsSb/GaAs quantum well lasers, 23^rd North American Conference on Molecular Beam Epitaxy, Santa Barbara CA (September 2005). 

21.  D. Ding, J.-B. Wang, S.-Q. Yu, S. R. Johnson, Y.-H. Zhang, Optimal Bandgap Energy for Optical Refrigeration in Semiconductors, SPIE 50^th Annual Meeting/Optics & Photonics 2005, San Diego CA (August 2005). 

20.  S.-Q. Yu, J.-B. Wang, D. Ding, S. R. Johnson, Y.-H. Zhang, Interplay of thermoelectric Cooling and Electroluminescence Refrigeration in LEDs, 24^th International Conference on Thermoelectrics, ITC 2005, Clemson SC (June 2005). 

19.  S. R. Johnson, D. Ding, J.-B. Wang, S.-Q. Yu, Y.-H. Zhang, Optical Refrigeration Window in Terms of Bandgap Energy and Optical Thickness, 4^th Annual Workshop on Laser Cooling of Solids, Albuquerque NM (June 2005). 

18.  D. Ding, S. R. Johnson, J.-B. Wang, S.-Q. Yu, Y.-H. Zhang, Thermodynamics of Optical Refrigeration in Semiconductors, 4^th Annual Workshop on Laser Cooling of Solids, Albuquerque NM (June 2005). 

17.  J.-B. Wang, D. Ding, S.-Q. Yu, S. R. Johnson, Y.-H. Zhang, Cooling Efficiency and Cooling Power of Semiconductor Electroluminescence Refrigeration, 4^th Annual Workshop on Laser Cooling of Solids, Albuquerque NM (June 2005). 

16.  J.-B. Wang, D. Ding, S.-Q. Yu, S. R. Johnson, Y.-H. Zhang, Impact of Photon Recycling on Photoluminescence Refrigeration in Semiconductors, 4^th Annual Workshop on Laser Cooling of Solids, Albuquerque NM (June 2005). 

15.  S.-Q. Yu, D. Ding, J.-B. Wang, S. R. Johnson, Y.-H. Zhang, Interplay of Thermoelectric Cooling and Electric Luminescence Cooling in LEDs, 4^th Annual Workshop on Laser Cooling of Solids, Albuquerque NM (June 2005). 

14.  D. Ding, S. R. Johnson, J.-B. Wang, S.-Q. Yu, Y.-H. Zhang, Thermodynamics of Optical Refrigeration in Semiconductors, Conference on Lasers and Electro Optics/International Quantum Electronics Conference, 2005 CLEO/IQEC, Baltimore MD (May 2005). 

13.  J.-B. Wang, D. Ding, S.-Q. Yu, S. R. Johnson, Y.-H. Zhang, Electroluminescence Cooling in Semiconductors, Conference on Lasers and Electro-Optics, Conference on Lasers and Electro Optics/International Quantum Electronics Conference, 2005 CLEO/IQEC, Baltimore MD (May 2005). 

12.  N. Samal, S. R. Johnson, D. Ding, A. K. Samal, S.-Q. Yu, Y.-H. Zhang, Novel VCSEL Design with Tailored Spatial Current Injection for High-Power Single-Mode Operation, SPIE Photonics West, San Jose CA (January 2005). 

11.  S.-Q. Yu, X. Jin, Y. Cao, D. Ding, J.-B. Wang, S. R. Johnson, Y.-H. Zhang, P. Dowd, M. Adamcyk, S. A. Chaparro, Above Room Temperature CW Edge-Emitting Lasers with GaAsP/GaAs/GaAsSb Active Regions, Optical Society of America, Conference on Lasers and Electro Optics/International Quantum Electronics Conference, 2004 CLEO/IQEC, San Francisco CA (May 2004). 

10.  Y. Cao, S.-Q. Yu, X. Jin, D. Ding, J.-B. Wang, S. R. Johnson, Y.-H. Zhang, Tunable MWIR Diode Lasers Gas Sensing Applications, Transportation and Homeland Security, 3^rd Micro Sensor Workshop, Scottsdale AZ (April 2004). 

9.    X. Jin, S.-Q. Yu, Y. Cao, D. Ding, J.-B. Wang, N. Samal, Yu. G. Sadofyev, S. R. Johnson, Y.-H. Zhang, 1.3 µm GaAsSb Resonant-Cavity Light-Emitting Diodes Grown on GaAs Substrate, IEEE Lasers and Electro-Optics Society 16^th Annual Meeting, Tucson AZ (October 2003). 

8.    Y. Cao, S.-Q. Yu, X. Jin, D. Ding, J.-B. Wang, S. R. Johnson, Y.-H. Zhang, Room Temperature CW Operation of 2.1 µm Quantum Well Lasers Grown on GaSb, 21^st North American Conference on Molecular Beam Epitaxy: Workshop, Keystone CO (September 2003). 

7.   S. R. Johnson, Yu. G. Sadofyev, K. Franzreb, Y. Cao, D. Ding, N. Samal, S. A. Chaparro, J.-B. Wang, X. Jin, S.-Q. Yu, Y.-H. Zhang, Sb-Mediated Growth of Si and Be Doped AlGaAs by Molecular Beam Epitaxy, 21^st North American Conference on Molecular Beam Epitaxy, Keystone CO (September 2003). 

6.    J.-B. Wang, S. R. Johnson, C. Z. Guo, S. A. Chaparro, J. A. Gupta, Yu. G. Sadofyev, Y. Cao, N. Samal, X. Jin, S.-Q. Yu, D. Ding, Y.-H. Zhang, Determination of GaAs/GaAsSb Heterojunction Conduction Band Offset, 2003 International Symposium on Compound Semiconductors, San Diego, CA (August 2003). 

5.    N. Samal, Y. Cao, D. Ding, J.-B. Wang, S.-Q. Yu, X. Jin, S. Chaparro, Yu. G. Sadofyev, S. R. Johnson, Y.-H. Zhang, Room Temperature CW Operation of Long Wavelength GaAsSb/GaAs VCSELs Grown on GaAs, SPIE Photonics West, San Jose CA (January 2003). 

4.    S. R. Johnson, C.-Z. Guo, S. Chaparro, Yu. G. Sadofyev, Y. Cao, D. Ding, J.-B. Wang, N. Samal, X. Jin, S.-Q. Yu, D. J. Smith, Y.-H. Zhang, Evaluating the Band Alignment of MBE Grown GaAsSb on GaAs, 12^th International Conference on Molecular Beam Epitaxy, MBE XII, San Francisco CA (September 2002). 

3.    S. R. Johnson, S. Chaparro, N. Samal, P. Dowd, S.-Q. Yu, J.-B. Wang, K. Shiralagi, Y.-H. Zhang, Room Temperature Continuous-Wave Operation of 1.3 µm GaAsP/GaAs/GaAsSb VCSELs Grown on GaAs, 28^th European Conference on Optical Communication, Copenhagen, Denmark (September 2002). 

2.    S. R. Johnson, S. Wu, Yu. G. Sadofyev, Y. Cao, S. Chaparro, J.-B. Wang, N. Samal, S.-Q. Yu, C. Navarro, X. Jin, Z.-B. Chen, D. Ding, C.-Z. Guo, N. Newman, Y.-H. Zhang, Ion and Neutral Energy Spectra for Dilute Nitride Growth, 20^th North American Conference on Molecular Beam Epitaxy, Providence RI (October 2001). 

1.    Z.-B. Chen, S. R. Johnson, C. Navarro, S. Chaparro, X. Jin, N. Samal, J.-B. Wang, Y. Cao, S.-Q. Yu, Y.-H. Zhang, Strain Compensated GaAsP/GaAsSb/GaAs 1.3 µm Lasers Grown on GaAs Using MBE, Conference on Lasers and Electro-Optics (CLEO-2001) Annual Meeting, Baltimore MD (May 2001).