Publications

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2011
Roy, T., Y. S. Puzyrev, E. Xia Zhang, S. DasGupta, S. A. Francis, D. M. Fleetwood, R. D. Schrimpf, U. K. Mishra, J. S. Speck, and S. T. Pantelides, "1/f Noise in GaN HEMTs grown under Ga-rich, N-rich, and NH3-rich conditions", Microelectronics Reliability, vol. 51, no. 2: Pergamon, pp. 212–216, 2011.
Raring, J. W., M. C. Schmidt, C. Poblenz, M. J. Mondry, P. Rudy, J. S. Speck, S. P. DenBaars, and S. Nakamura, "47.1: Invited Paper: Progress in Green and Blue Laser Diodes and Their Application in Pico Projection Systems", SID Symposium Digest of Technical Papers, vol. 42, no. 1: Wiley Online Library, pp. 677–680, 2011.
Pimputkar, S., D. S. Kamber, J. S. Speck, and S. Nakamura, Addition of hydrogen and/or nitrogen containing compounds to the nitrogen-containing solvent used during the ammonothermal growth of group-iii nitride crystals, sep # " 1", 2011.
Prosa, TJ., PH. Clifton, H. Zhong, A. Tyagi, R. Shivaraman, SP. DenBaars, S. Nakamura, and JS. Speck, "Atom probe analysis of interfacial abruptness and clustering within a single In x Ga 1- x N quantum well device on semipolar (10 1\= 1\=) GaN substrate", Applied physics letters, vol. 98, no. 19: AIP, pp. 191903, 2011.
Pimputkar, S., S. Kawabata, J. Speck, and S. Nakamura, "Bulk GaN Growth on GaN Seeds of Varying Orientations in Supercritical Basic Ammonia", Minerals, Metals and Materials Society/AIME, 420 Commonwealth Dr., P. O. Box 430 Warrendale PA 15086 United States.[np]. Jun: Minerals, Metals and Materials Society/AIME, 420 Commonwealth Dr., P. O. Box 430 Warrendale PA 15086 United States, 2011.
Pfüller, C., O. Brandt, T. Flissikowski, HT. Grahn, T. Ive, JS. Speck, and SP. DenBaars, "Comparison of the spectral and temporal emission characteristics of homoepitaxial and heteroepitaxial ZnO nanowires", Applied Physics Letters, vol. 98, no. 11: AIP, pp. 113113, 2011.
Pimputkar, S., D. S. Kamber, J. S. Speck, and S. Nakamura, Controlling relative growth rates of different exposed crystallographic facets of a group-iii nitride crystal during the ammonothermal growth of a group-iii nitride crystal, 2011.
Kamber, D. S., S. Pimputkar, M. Saito, S. P. DenBaars, J. S. Speck, and S. Nakamura, Group-iii nitride monocrystal with improved purity and method of producing the same, 2011.
Zhao, Y., S. Tanaka, Q. Yan, C-Y. Huang, R. B. Chung, C-C. Pan, K. Fujito, D. Feezell, C. G. Van de Walle, J. S. Speck, et al., "High optical polarization ratio from semipolar (20 2\= 1\=) blue-green InGaN/GaN light-emitting diodes", Applied physics letters, vol. 99, no. 5: AIP, pp. 051109, 2011.
Zhao, Y., S. Tanaka, R. Chung, C-C. Pan, K. Fujito, D. Feezell, J. Speck, S. DenBaars, and S. Nakamura, "Highly Polarized Spontaneous Emission from Semipolar(20-2-1) InGaN/GaN Light-Emitting Diodes", Minerals, Metals and Materials Society/AIME, 420 Commonwealth Dr., P. O. Box 430 Warrendale PA 15086 United States.[np]. Jun: Minerals, Metals and Materials Society/AIME, 420 Commonwealth Dr., P. O. Box 430 Warrendale PA 15086 United States, 2011.
Wang, Q. Jie, C. Yan, N. Yu, C. Pflügl, L. Diehl, F. Capasso, J. Unterhinninghofen, J. Wiersig, T. Edamura, and M. Yamanishi, "Highly unidirectional whispering gallery mode lasers", Conference on Lasers and Electro-Optics/Pacific Rim: Optical Society of America, pp. J143, 2011.
Raring, J. W., M. C. Schmidt, C. Poblenz, B. Li, Y-C. Chang, M. J. Mondry, Y-. Da Lin, M. R. Krames, R. Craig, J. S. Speck, et al., "High-performance blue and green laser diodes based on nonpolar/semipolar bulk GaN substrates", Gallium Nitride Materials and Devices Vi, vol. 7939: International Society for Optics and Photonics, pp. 79390Y, 2011.
Schmidt, M. C., C. Poblenz, Y-C. Chang, B. Li, M. J. Mondry, J. Iveland, M. R. Krames, R. Craig, J. W. Raring, J. S. Speck, et al., "High-performance blue and green laser diodes based on nonpolar/semipolar GaN substrates", Laser Technology for Defense and Security VII, vol. 8039: International Society for Optics and Photonics, pp. 80390D, 2011.
Zhao, Y., S. Tanaka, C-C. Pan, K. Fujito, D. Feezell, J. S. Speck, S. P. DenBaars, and S. Nakamura, "High-power blue-violet semipolar (2021) InGaN/GaN light-emitting diodes with low efficiency droop at 200 A/cm2", Applied physics express, vol. 4, no. 8: IOP Publishing, pp. 082104, 2011.
Ťapajna, M., SW. Kaun, MH. Wong, F. Gao, T. Palacios, UK. Mishra, JS. Speck, and M. Kuball, "Influence of threading dislocation density on early degradation in AlGaN/GaN high electron mobility transistors", Applied Physics Letters, vol. 99, no. 22: AIP, pp. 223501, 2011.
Farrell, R. M., C. J. Neufeld, S. C. Cruz, NG. Young, M. Iza, J. R. Lang, Y-L. Hu, D. Simeonov, N. Singh, E. E. Perl, et al., "InGaN-Based Solar Cells for Ultrahigh Efficiency Multijunction Solar Cell Applications", UC Solar Symposlum, 2011.
Poblenz, C., J. S. Speck, and D. S. Kamber, Large-area seed for ammonothermal growth of bulk gallium nitride and method of manufacture, 2011.
Arehart, AR., AC. Malonis, C. Poblenz, Y. Pei, JS. Speck, UK. Mishra, and SA. Ringel, "Next generation defect characterization in nitride HEMTs", physica status solidi (c), vol. 8, no. 7-8: Wiley Online Library, pp. 2242–2244, 2011.
Arehart, AR., AC. Malonis, C. Poblenz, Y. Pei, JS. Speck, UK. Mishra, and SA. Ringel, "Next generation defect characterization in nitride HEMTs", physica status solidi (c), vol. 8, no. 7-8: Wiley Online Library, pp. 2242–2244, 2011.
Pimputkar, S., D. S. Kamber, J. S. Speck, and S. Nakamura, Novel vessel designs and relative placements of the source material and seed crystals with respect to the vessel for the ammonothermal growth of group-iii nitride crystals, 2011.
Brinkley, S. E., Y-. Da Lin, A. Chakraborty, N. Pfaff, D. Cohen, J. S. Speck, S. Nakamura, and S. P. DenBaars, "Polarized spontaneous emission from blue-green m-plane GaN-based light emitting diodes", Applied Physics Letters, vol. 98, no. 1: AIP, pp. 011110, 2011.
Raring, JW., MC. Schmidt, C. Poblenz, Y. Lin, C. Bai, P. Rudy, JS. Speck, SP. DenBaars, and S. Nakamura, "Recent progress in InGaN-based laser diodes fabricated on nonpolar/semipolar substrates", Photonics Conference (PHO), 2011 IEEE: IEEE, pp. 503–504, 2011.
Gao, F., B. Lu, L. Li, S. Kaun, J. S. Speck, C. V. Thompson, and T. Palacios, "Role of oxygen in the OFF-state degradation of AlGaN/GaN high electron mobility transistors", Applied Physics Letters, vol. 99, no. 22: AIP, pp. 223506, 2011.
Roy, T., EX. Zhang, YS. Puzyrev, X. Shen, DM. Fleetwood, RD. Schrimpf, G. Koblmueller, R. Chu, C. Poblenz, N. Fichtenbaum, et al., "Temperature-dependence and microscopic origin of low frequency 1/f noise in GaN/AlGaN high electron mobility transistors", Applied Physics Letters, vol. 99, no. 20: AIP, pp. 203501, 2011.
Roy, T., EX. Zhang, YS. Puzyrev, X. Shen, DM. Fleetwood, RD. Schrimpf, G. Koblmueller, R. Chu, C. Poblenz, N. Fichtenbaum, et al., "Temperature-dependence and microscopic origin of low frequency 1/f noise in GaN/AlGaN high electron mobility transistors", Applied Physics Letters, vol. 99, no. 20: AIP, pp. 203501, 2011.

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