Publications

Found 89 results
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2011
Fujiwara, T., R. Yeluri, D. Denninghoff, J. Lu, S. Keller, J. S. Speck, S. P. DenBaars, and U. K. Mishra, "Enhancement-mode m-plane AlGaN/GaN heterojunction field-effect transistors with+ 3 V of threshold voltage using Al2O3 deposited by atomic layer deposition", Applied physics express, vol. 4, no. 9: IOP Publishing, pp. 096501, 2011.
Keller, S., Y. Dora, S. Chowdhury, F. Wu, X. Chen, S. P. DenBaars, J. S. Speck, and U. K. Mishra, "Growth and characterization of N-polar GaN and AlGaN/GaN HEMTs on (111) silicon", physica status solidi (c), vol. 8, no. 7-8: Wiley Online Library, pp. 2086–2088, 2011.
Chung, R. B., F. Wu, R. Shivaraman, S. Keller, S. P. DenBaars, J. S. Speck, and S. Nakamura, "Growth study and impurity characterization of AlxIn1- xN grown by metal organic chemical vapor deposition", Journal of Crystal Growth, vol. 324, no. 1: North-Holland, pp. 163–167, 2011.
Matioli, E., C. Neufeld, M. Iza, S. C. Cruz, A. A. Al-Heji, X. Chen, R. M. Farrell, S. Keller, S. DenBaars, U. Mishra, et al., "High internal and external quantum efficiency InGaN/GaN solar cells", Applied Physics Letters, vol. 98, no. 2: AIP, pp. 021102, 2011.
Farrell, R. M., C. J. Neufeld, S. C. Cruz, J. R. Lang, M. Iza, S. Keller, S. Nakamura, SP. DenBaars, UK. Mishra, and JS. Speck, "High quantum efficiency InGaN/GaN multiple quantum well solar cells with spectral response extending out to 520 nm", Applied Physics Letters, vol. 98, no. 20: AIP, pp. 201107, 2011.
Craven, M. D., S. Keller, S. P. DenBaars, T. Margalith, J. Stephen Speck, S. Nakamura, and U. K. Mishra, Non-polar (Al, B, In, Ga) N quantum well and heterostructure materials and devices, 2011.
Denninghoff, D., S. Dasgupta, J. Lu, D. Brown, S. Keller, J. Speck, and U. Mishra, "N-Polar GaN HEMTs Grown by MBE and MOCVD with fmax of 255 and 250 GHz, Respectively", 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.
Dasgupta, S., S. Keller, J. S. Speck, U. K. Mishra, and others, "N-Polar GaN/AlN MIS-HEMT With $ f_ ${$$\backslash$rm MAX$}$ $ of 204 GHz for Ka-Band Applications", IEEE Electron Device Letters, vol. 32, no. 12: IEEE, pp. 1683–1685, 2011.
Neufeld, C. J., S. C. Cruz, R. M. Farrell, M. Iza, S. Keller, S. Nakamura, S. P. DenBaars, J. S. Speck, and U. K. Mishra, "Observation of positive thermal power coefficient in InGaN/GaN quantum well solar cells", Applied Physics Letters, vol. 99, no. 7: AIP, pp. 071104, 2011.
Dasgupta, S., D. F. Brown, U. Singisetti, S. Keller, J. S. Speck, U. K. Mishra, and others, "Self-aligned technology for N-polar GaN/Al (Ga) N MIS-HEMTs", IEEE Electron Device Letters, vol. 32, no. 1: IEEE, pp. 33–35, 2011.
Chung, R. B., O. Bierwagen, F. Wu, S. Keller, S. P. DenBaars, J. S. Speck, and S. Nakamura, "Semiconductors, dielectrics, and organic materials-101001 Temperature Dependent Capacitance-Voltage Analysis of Unintentionally Doped and Si Doped Al0. 82 In0. 18N Grown on GaN", Japanese Journal of Applied Physics, vol. 50, no. 10, 2011.
Chung, R. B., O. Bierwagen, F. Wu, S. Keller, S. P. DenBaars, J. S. Speck, and S. Nakamura, "Temperature Dependent Capacitance–Voltage Analysis of Unintentionally Doped and Si Doped Al0. 82In0. 18N Grown on GaN", Japanese Journal of Applied Physics, vol. 50, no. 10R: IOP Publishing, pp. 101001, 2011.
2012
Lu, J., Y-L. Hu, D. F. Brown, F. Wu, S. Keller, J. S. Speck, S. P. DenBaars, and U. K. Mishra, "Charge and Mobility Enhancements in In-Polar InAl (Ga) N/Al (Ga) N/GaN Heterojunctions Grown by Metal–Organic Chemical Vapor Deposition Using a Graded Growth Strategy", Japanese Journal of Applied Physics, vol. 51, no. 11R: IOP Publishing, pp. 115502, 2012.
Keller, S., J. Lu, U. K. Mishra, S. P. DenBaars, and J. S. Speck, "Effect of indium on the conductivity of poly-crystalline GaN grown on high purity fused silica", physica status solidi (a), vol. 209, no. 3: WILEY-VCH Verlag Berlin, pp. 431–433, 2012.
Hu, Y-L., R. M. Farrell, C. J. Neufeld, M. Iza, S. C. Cruz, N. Pfaff, D. Simeonov, S. Keller, S. Nakamura, S. P. DenBaars, et al., "Effect of quantum well cap layer thickness on the microstructure and performance of InGaN/GaN solar cells", Applied Physics Letters, vol. 100, no. 16: AIP, pp. 161101, 2012.
Fujiwara, T., S. Keller, J. S. Speck, S. P. DenBaars, and U. K. Mishra, "Enhancement-mode m-plane AlGaN/GaN HFETs with regrown n+-GaN contact layer", physica status solidi (c), vol. 9, no. 3-4: Wiley Online Library, pp. 891–893, 2012.
Craven, M. D., S. Keller, S. P. DenBaars, T. Margalith, J. S. Speck, S. Nakamura, and U. K. Mishra, Non-polar (Al, B, In, Ga) N quantum well and heterostructure materials and devices, may # " 29", 2012.
Craven, M. D., S. Keller, S. P. DenBaars, T. Margalith, J. Stephen Speck, S. Nakamura, and U. K. Mishra, NON-POLAR (Al, B, In, Ga) N QUANTUM WELL AND HETEROSTRUCTURE MATERIALS AND DEVICES, 2012.
2013
Mazumder, B., S. W. Kaun, J. Lu, S. Keller, U. K. Mishra, and J. S. Speck, "Atom probe analysis of AlN interlayers in AlGaN/AlN/GaN heterostructures", Applied Physics Letters, vol. 102, no. 11: AIP, pp. 111603, 2013.
Mazumder, B., S. W. Kaun, J. Lu, S. Keller, U. K. Mishra, and J. S. Speck, "Atom probe characterization of an AlN interlayer within HEMT structures grown by molecular beam epitaxy and metal-organic chemical vapor deposition", Bulletin of the American Physical Society, vol. 58: American Physical Society, 2013.
Schaake, C. A., D. F. Brown, B. L. Swenson, S. Keller, J. S. Speck, and U. K. Mishra, "A donor-like trap at the InGaN/GaN interface with net negative polarization and its possible consequence on internal quantum efficiency", Semiconductor Science and Technology, vol. 28, no. 10: IOP Publishing, pp. 105021, 2013.
Chakraborty, A., B. A. Haskell, S. Keller, J. S. Speck, S. P. DenBaars, S. Nakamura, and U. K. Mishra, Fabrication of nonpolar indium gallium nitride thin films, heterostructures and devices by metalorganic chemical vapor deposition, 2013.
Keller, S., R. M. Farrell, M. Iza, Y. Terao, N. Young, U. K. Mishra, S. Nakamura, S. P. DenBaars, and J. S. Speck, "Influence of the structure parameters on the relaxation of semipolar InGaN/GaN multi quantum wells", Japanese Journal of Applied Physics, vol. 52, no. 8S: IOP Publishing, pp. 08JC10, 2013.
Farrell, R. M., D. J. Friedman, NG. Young, EE. Perl, N. Singh, , CJ. Neufeld, M. Iza, SC. Cruz, S. Keller, et al., "InGaN-based solar cells and high-performance broadband optical coatings for ultrahigh efficiency hybrid multijunction device designs", Lasers and Electro-Optics (CLEO), 2013 Conference on: IEEE, pp. 1–2, 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.

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