Publications

Found 51 results
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2017
Yonkee, B. P., E. C. Young, S. P. DenBaars, J. S. Speck, and S. Nakamura, "High reflectivity Ohmic contacts to n-GaN utilizing vacuum annealed aluminum", Semiconductor Science and Technology, vol. 33, no. 1: IOP Publishing, pp. 015015, 2017.
Kuritzky, L. Y., A. C. Espenlaub, B. P. Yonkee, C. D. Pynn, S. P. DenBaars, S. Nakamura, C. Weisbuch, and J. S. Speck, "High wall-plug efficiency blue III-nitride LEDs designed for low current density operation", Optics express, vol. 25, no. 24: Optical Society of America, pp. 30696–30707, 2017.
2016
Shen, C., C. Lee, T. Khee Ng, S. Nakamura, J. S. Speck, S. P. DenBaars, A. Y. Alyamani, M. M. El-Desouki, and B. S. Ooi, "High gain semiconductor optical amplifieróLaser diode at visible wavelength", Electron Devices Meeting (IEDM), 2016 IEEE International: IEEE, pp. 22–4, 2016.
Kyle, E. C. H., S. W. Kaun, F. Wu, B. Bonef, and J. S. Speck, "High indium content homogenous InAlN layers grown by plasma-assisted molecular beam epitaxy", Journal of Crystal Growth, vol. 454: North-Holland, pp. 164–172, 2016.
Alhassan, A. I., R. M. Farrell, B. Saifaddin, A. Mughal, F. Wu, S. P. DenBaars, S. Nakamura, and J. S. Speck, "High luminous efficacy green light-emitting diodes with AlGaN cap layer", Optics express, vol. 24, no. 16: Optical Society of America, pp. 17868–17873, 2016.
Cantore, M., N. Pfaff, R. M. Farrell, J. S. Speck, S. Nakamura, and S. P. DenBaars, "High luminous flux from single crystal phosphor-converted laser-based white lighting system", Optics Express, vol. 24, no. 2: Optical Society of America, pp. A215–A221, 2016.
Pourhashemi, A., R. M. Farrell, S. P. DenBaars, J. S. Speck, and S. Nakamura, High power blue-violet III-nitride semipolar laser diodes, may # " 31", 2016.
Lee, C., C. Zhang, D. Becerra, S. Lee, S. Ho Oh, R. M. Farrell, J. S. Speck, S. Nakamura, J. E. Bowers, and S. P. DenBaars, "High speed performance of III-nitride laser diode grown on (2021) semipolar plane for visible light communication", Photonics Conference (IPC), 2016 IEEE: IEEE, pp. 809–810, 2016.
Shen, C., T. Khee Ng, J. T. Leonard, A. Pourhashemi, S. Nakamura, S. P. DenBaars, J. S. Speck, A. Y. Alyamani, M. M. El-Desouki, and B. S. Ooi, "High-brightness semipolar (2021) blue InGaN/GaN superluminescent diodes for droop-free solid-state lighting and visible-light communications", Optics letters, vol. 41, no. 11: Optical Society of America, pp. 2608–2611, 2016.
Chen, J., Y. S. Puzyrev, E. Xia Zhang, D. M. Fleetwood, R. D. Schrimpf, A. R. Arehart, S. A. Ringel, S. W. Kaun, E. C. H. Kyle, J. S. Speck, et al., "High-field stress, low-frequency noise, and long-term reliability of AlGaN/GaN HEMTs", IEEE Transactions on Device and Materials Reliability, vol. 16, no. 3: IEEE, pp. 282–289, 2016.
Shen, C., T. Khee Ng, J. T. Leonard, A. Pourhashemi, H. M. Oubei, M. S. Alias, S. Nakamura, S. P. DenBaars, J. S. Speck, A. Y. Alyamani, et al., "High-modulation-efficiency, integrated waveguide modulator–laser diode at 448 nm", Acs Photonics, vol. 3, no. 2: American Chemical Society, pp. 262–268, 2016.
Shen, C., C. Lee, T. Khee Ng, S. Nakamura, J. S. Speck, S. P. DenBaars, A. Y. Alyamani, M. M. El-Desouki, and B. S. Ooi, "High-speed 405-nm superluminescent diode (SLD) with 807-MHz modulation bandwidth", Optics express, vol. 24, no. 18: Optical Society of America, pp. 20281–20286, 2016.
Lee, C., C. Zhang, D. L. Becerra, S. Lee, R. M. Farrell, J. S. Speck, S. Nakamura, J. E. Bowers, and S. P. DenBaars, "High-speed performance of III-nitride 410 nm ridge laser diode on (202Ø1Ø) plane for visible light communication", Compound Semiconductor Week (CSW)[Includes 28th International Conference on Indium Phosphide & Related Materials (IPRM) & 43rd International Symposium on Compound Semiconductors (ISCS), 2016: IEEE, pp. 1–2, 2016.
Yonkee, B. P., E. C. Young, J. T. Leonard, C. Lee, S. Ho Oh, S. P. DenBaars, J. S. Speck, and S. Nakamura, "Hybrid MOCVD/MBE GaN tunnel junction LEDs with greater than 70% wall plug efficiency", Compound Semiconductor Week (CSW)[Includes 28th International Conference on Indium Phosphide & Related Materials (IPRM) & 43rd International Symposium on Compound Semiconductors (ISCS), 2016: IEEE, pp. 1–1, 2016.
Young, E. C., B. P. Yonkee, F. Wu, S. Ho Oh, S. P. DenBaars, S. Nakamura, and J. S. Speck, "Hybrid tunnel junction contacts to III–nitride light-emitting diodes", Applied Physics Express, vol. 9, no. 2: IOP Publishing, pp. 022102, 2016.
2015
Papadogianni, A., M. E. White, J. S. Speck, Z. Galazka, and O. Bierwagen, "Hall and Seebeck measurements estimate the thickness of a (buried) carrier system: Identifying interface electrons in In-doped SnO2 films", Applied Physics Letters, vol. 107, no. 25: AIP Publishing, pp. 252105, 2015.
McSkimming, B. M., C. Chaix, and J. S. Speck, "High active nitrogen flux growth of GaN by plasma assisted molecular beam epitaxy", Journal of Vacuum Science & Technology A: Vacuum, Surfaces, and Films, vol. 33, no. 5: AVS, pp. 05E128, 2015.
Zhong, H., A. Tyagi, K. J. Vampola, J. S. Speck, S. P. DenBaars, and S. Nakamura, High light extraction efficiency nitride based light emitting diode by surface roughening, 2015.
2014
Saito, M., S-ichiro. Kawabata, D. S. Kamber, S. P. DenBaars, J. S. Speck, and S. Nakamura, Hexagonal wurtzite type epitaxial layer possessing a low alkali-metal concentration and method of creating the same, 2014.
Kyle, E. C. H., S. W. Kaun, P. G. Burke, F. Wu, Y-R. Wu, and J. S. Speck, "High-electron-mobility GaN grown on free-standing GaN templates by ammonia-based molecular beam epitaxy", Journal of applied physics, vol. 115, no. 19: AIP, pp. 193702, 2014.
2013
Young, E. C., and J. S. Speck, "Heteroepitaxial Lattice Mismatch Stress Relaxation in Nonpolar and Semipolar GaN by Dislocation Glide", ECS Transactions, vol. 50, no. 9: The Electrochemical Society, pp. 797–800, 2013.
Nakamura, S., S. P. DenBaars, D. F. Feezell, J. S. Speck, C-C. Pan, and S. Tanaka, High output power, high efficiency blue light-emitting diodes, nov # " 14", 2013.
2012
Bierwagen, O., S. Choi, and J. S. Speck, "Hall and Seebeck measurement of a p-n layer stack: Determining InN bulk hole transport properties in the presence of a strong surface electron accumulation layer", Physical Review B, vol. 85, no. 16: APS, pp. 165205, 2012.
Speck, J. S., "Heteroepitaxial Lattice Mismatch Stress Relaxation in Nonpolar and Semipolar GaN by Dislocation Glide", Meeting Abstracts, no. 43: The Electrochemical Society, pp. 3202–3202, 2012.
Zhao, Y., S. Tanaka, C-Y. Huang, D. F. Feezell, J. S. Speck, S. P. DenBaars, and S. Nakamura, High indium uptake and high polarization ratio for group-iii nitride optoelectronic devices fabricated on a semipolar (20-2-1) plane of a gallium nitride substrate, 2012.

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