Publications

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2012
Haeger, D., E. Young, R. Chung, F. Wu, S. Nakamura, S. DenBaars, J. S. Speck, A. Romanov, and D. A. Cohen, "384nm AlGaN Diode Lasers on Relaxed Semipolar Buffers", CLEO: Science and Innovations: Optical Society of America, pp. CTu2N–4, 2012.
Hsu, P. Shan, M. T. Hardy, F. Wu, I. Koslow, E. C. Young, A. E. Romanov, K. Fujito, D. F. Feezell, S. P. DenBaars, J. S. Speck, et al., "444.9 nm semipolar (11 2\= 2) laser diode grown on an intentionally stress relaxed InGaN waveguiding layer", Applied Physics Letters, vol. 100, no. 2: AIP, pp. 021104, 2012.
Sasikumar, A., A. Arehart, S. Kolluri, MH. Wong, S. Keller, SP. DenBaars, JS. Speck, UK. Mishra, and SA. Ringel, "Access-region defect spectroscopy of DC-stressed N-polar GaN MIS-HEMTs", IEEE Electron Device Letters, vol. 33, no. 5: IEEE, pp. 658–660, 2012.
Raman, A., C. A. Hurni, J. S. Speck, and U. K. Mishra, "AlGaN/GaN heterojunction bipolar transistors by ammonia molecular beam epitaxy", physica status solidi (a), vol. 209, no. 1: Wiley Online Library, pp. 216–220, 2012.
Das, NC., ML. Reed, AV. Sampath, H. Shen, M. Wraback, RM. Farrell, M. Iza, SC. Cruz, , NG. Young, et al., "Anti Reflection (AR) Coating for Indium Gallium Nitride (InGaN) Solar Cells", Army Research Laboratory Report, 08/2012.
Choi, P-P., O. Cojocaru-Mirédin, D. Abou-Ras, R. Caballero, D. Raabe, V. S. Smentkowski, C. Gyung Park, G. Ho Gu, B. Mazumder, M. Hoi Wong, et al., "Atom probe tomography of compound semiconductors for photovoltaic and light-emitting device applications", Microscopy Today, vol. 20, no. 3: Cambridge University Press, pp. 18–24, 2012.
Garrett, G. A., P. Rotella, H. Shen, M. Wraback, D. A. Haeger, R. B. Chung, N. Pfaff, E. C. Young, S. P. DenBaars, J. S. Speck, et al., "Carrier dynamics in active regions for ultraviolet optoelectronics grown on thick, relaxed AlGaN on semipolar bulk GaN", physica status solidi (b), vol. 249, no. 3: Wiley Online Library, pp. 507–510, 2012.
Young, E. C., F. Wu, A. E. Romanov, D. A. Haeger, S. Nakamura, S. P. DenBaars, D. A. Cohen, and J. S. Speck, "Compositionally graded relaxed AlGaN buffers on semipolar GaN for mid-ultraviolet emission", Applied Physics Letters, vol. 101, no. 14: AIP, pp. 142109, 2012.
Zhang, Z., CA. Hurni, AR. Arehart, J. Yang, RC. Myers, JS. Speck, and SA. Ringel, "Deep traps in nonpolar m-plane GaN grown by ammonia-based molecular beam epitaxy", Applied Physics Letters, vol. 100, no. 5: AIP, pp. 052114, 2012.
Sasikumar, A., A. Arehart, SA. Ringel, S. Kaun, MH. Wong, UK. Mishra, and JS. Speck, "Direct correlation between specific trap formation and electric stress-induced degradation in MBE-grown AlGaN/GaN HEMTs", Reliability Physics Symposium (IRPS), 2012 IEEE International: IEEE, pp. 2C–3, 2012.
Das, NC., ML. Reed, AV. Sampath, H. Shen, M. Wraback, RM. Farrell, M. Iza, SC. Cruz, , NG. Young, et al., "Heterogeneous integration of InGaN and Silicon solar cells for enhanced energy harvesting", Photovoltaic Specialists Conference (PVSC), 2012 38th IEEE: IEEE, pp. 003076–003079, 2012.
Zhang, Z., CA. Hurni, AR. Arehart, JS. Speck, and SA. Ringel, "Influence of V/III growth flux ratio on trap states in m-plane GaN grown by ammonia-based molecular beam epitaxy", Applied Physics Letters, vol. 101, no. 15: AIP, pp. 152104, 2012.
Cardwell, DW., AR. Arehart, C. Poblenz, Y. Pei, JS. Speck, UK. Mishra, SA. Ringel, and JP. Pelz, "Nm-scale measurements of fast surface potential transients in an AlGaN/GaN high electron mobility transistor", Applied Physics Letters, vol. 100, no. 19: AIP, pp. 193507, 2012.
Koslow, I. L., M. T. Hardy, P. Shan Hsu, P-Y. Dang, F. Wu, A. Romanov, Y-R. Wu, E. C. Young, S. Nakamura, J. S. Speck, et al., "Performance and polarization effects in (11 2\= 2) long wavelength light emitting diodes grown on stress relaxed InGaN buffer layers", Applied Physics Letters, vol. 101, no. 12: AIP, pp. 121106, 2012.
Hsu, P. Shan, M. T. Hardy, E. C. Young, A. E. Romanov, S. P. DenBaars, S. Nakamura, and J. S. Speck, "Stress relaxation and critical thickness for misfit dislocation formation in (10 1\= 0) and (30 31\=) InGaN/GaN heteroepitaxy", Applied Physics Letters, vol. 100, no. 17: AIP, pp. 171917, 2012.
Hardy, M. T., P. Shan Hsu, F. Wu, I. L. Koslow, E. C. Young, S. Nakamura, A. E. Romanov, S. P. DenBaars, and J. S. Speck, "Trace analysis of non-basal plane misfit stress relaxation in (20 2\= 1) and (30 3\= 1\=) semipolar InGaN/GaN heterostructures", Applied Physics Letters, vol. 100, no. 20: AIP, pp. 202103, 2012.
Speck, J. S., A. Tyagi, A. E. Romanov, S. Nakamura, and S. P. DenBaars, Vicinal semipolar iii-nitride substrates to compensate tilt of relaxed hetero-epitaxial layers, 2012.

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