Publications

Found 301 results
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2014
Ahmadi, E., H. Chalabi, S. W. Kaun, R. Shivaraman, J. S. Speck, and U. K. Mishra, "Contribution of alloy clustering to limiting the two-dimensional electron gas mobility in AlGaN/GaN and InAlN/GaN heterostructures: Theory and experiment", Journal of Applied Physics, vol. 116, no. 13: AIP Publishing, pp. 133702, 2014.
Sasikumar, A., AR. Arehart, SW. Kaun, J. Chen, EX. Zhang, DM. Fleetwood, RD. Schrimpf, JS. Speck, and SA. Ringel, "Defects in GaN based transistors", Gallium Nitride Materials and Devices IX, vol. 8986: International Society for Optics and Photonics, pp. 89861C, 2014.
Zhang, Z., C. M. Jackson, A. R. Arehart, B. McSkimming, J. S. Speck, and S. A. Ringel, "Direct Determination of Energy Band Alignments of Ni/Al 2 O 3/GaN MOS Structures Using Internal Photoemission Spectroscopy", Journal of electronic materials, vol. 43, no. 4: Springer US, pp. 828–832, 2014.
Ahmadi, E., R. Shivaraman, F. Wu, S. Wienecke, S. W. Kaun, S. Keller, J. S. Speck, and U. K. Mishra, "Elimination of columnar microstructure in N-face InAlN, lattice-matched to GaN, grown by plasma-assisted molecular beam epitaxy in the N-rich regime", Applied Physics Letters, vol. 104, no. 7: AIP, pp. 072107, 2014.
Kaun, S. W., E. Ahmadi, B. Mazumder, F. Wu, E. C. H. Kyle, P. G. Burke, U. K. Mishra, and J. S. Speck, "GaN-based high-electron-mobility transistor structures with homogeneous lattice-matched InAlN barriers grown by plasma-assisted molecular beam epitaxy", Semiconductor Science and Technology, vol. 29, no. 4: IOP Publishing, pp. 045011, 2014.
Watanabe, K., T. Ohsawa, I. Sakaguchi, O. Bierwagen, M. E. White, M-Y. Tsai, R. Takahashi, E. M. Ross, Y. Adachi, J. S. Speck, et al., "Investigation of charge compensation in indium-doped tin dioxide by hydrogen insertion via annealing under humid conditions", Applied Physics Letters, vol. 104, no. 13: AIP, pp. 132110, 2014.
Shen, C., T. Khee Ng, B. Janjua, A. Alyamani, M. M. El-Desouki, J. Speck, S. DenBaars, and B. Ooi, "Optical gain and absorption of 420 nm InGaN-based laser diodes grown on m-plane GaN substrate", Asia Communications and Photonics Conference: Optical Society of America, pp. AW4A–1, 2014.
Sasikumar, A., DW. Cardwell, AR. Arehart, J. Lu, SW. Kaun, S. Keller, UK. Mishra, JS. Speck, JP. Pelz, and SA. Ringel, "Toward a physical understanding of the reliability-limiting E C-0.57 eV trap in GaN HEMTs", Reliability Physics Symposium, 2014 IEEE International: IEEE, pp. 2C–1, 2014.
Prozheeva, V., F. Tuomisto, G. Koblmüller, J. S. Speck, A. Knübel, and R. Aidam, "Vacancy defect formation in PA-MBE grown C-doped InN", physica status solidi (c), vol. 11, no. 3-4: Wiley Online Library, pp. 530–532, 2014.
2013
Farrell, RM., AA. Al-Heji, CJ. Neufeld, X. Chen, M. Iza, SC. Cruz, S. Keller, S. Nakamura, SP. DenBaars, UK. Mishra, et al., "Effect of intentional p-GaN surface roughening on the performance of InGaN/GaN solar cells", Applied Physics Letters, vol. 103, no. 24: AIP, pp. 241104, 2013.
Zhang, Z., AR. Arehart, E. Cinkilic, J. Chen, EX. Zhang, DM. Fleetwood, RD. Schrimpf, B. McSkimming, JS. Speck, and SA. Ringel, "Impact of proton irradiation on deep level states in n-GaN", Applied Physics Letters, vol. 103, no. 4: AIP, pp. 042102, 2013.
Armstrong, AM., K. Kelchner, S. Nakamura, SP. DenBaars, and J. S. Speck, "Influence of growth temperature and temperature ramps on deep level defect incorporation in m-plane GaN", Applied Physics Letters, vol. 103, no. 23: AIP, pp. 232108, 2013.
Jackson, C. M., A. R. Arehart, E. Cinkilic, B. McSkimming, J. S. Speck, and S. A. Ringel, "Interface trap characterization of atomic layer deposition Al2O3/GaN metal-insulator-semiconductor capacitors using optically and thermally based deep level spectroscopies", Journal of Applied Physics, vol. 113, no. 20: AIP, pp. 204505, 2013.
Wong, M. Hoi, S. Keller, S. Dasgupta Nidhi, D. J. Denninghoff, S. Kolluri, D. F. Brown, J. Lu, N. A. Fichtenbaum, E. Ahmadi, U. Singisetti, et al., "N-polar GaN epitaxy and high electron mobility transistors", Semiconductor Science and Technology, vol. 28, no. 7: IOP Publishing, pp. 074009, 2013.
Cardwell, DW., A. Sasikumar, AR. Arehart, SW. Kaun, J. Lu, S. Keller, JS. Speck, UK. Mishra, SA. Ringel, and JP. Pelz, "Spatially-resolved spectroscopic measurements of Ec- 0.57 eV traps in AlGaN/GaN high electron mobility transistors", Applied Physics Letters, vol. 102, no. 19: AIP, pp. 193509, 2013.
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.
Henry, T. A., A. Armstrong, K. M. Kelchner, S. Nakamura, SP. DenBaars, and JS. Speck, "Assessment of deep level defects in m-plane GaN grown by metalorganic chemical vapor deposition", Applied Physics Letters, vol. 100, no. 8: AIP, pp. 082103, 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.
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.
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.
Choi, S-B., S-Y. Bae, D-S. Lee, B. Hyun Kong, H. Koun Cho, J-H. Song, B-J. Ahn, J. F. Keading, S. Nakamura, S. P. DenBaars, et al., "Optical Characterization of Double Peak Behavior in 101Ø1 Semipolar Light-Emitting Diodes on Miscut m-Plane Sapphire Substrates", Japanese Journal of Applied Physics, vol. 51, no. 5R: IOP Publishing, pp. 052101, 2012.
2011
Zhang, Z., C. Hurni, A. Arehart, J. Speck, and S. Ringel, "Deep Traps in M-Plane GaN Grown by Ammonia MBE", 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.

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