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Proceedings Paper

Recent advances in III-nitride materials, characterization and device applications
Author(s): Manijeh Razeghi; Xiaolong Zhang; Patrick Kung; Adam W. Saxler; Danielle Walker; Khee Yong Lim; K. S. Kim
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Paper Abstract

High-quality AlN, GaN, AlGaN have been grown on sapphire substrate by low-pressure metalorganic chemical vapor deposition (LP-MOCVD). The x-ray rocking curve of AlN and GaN were 100 arcsecs and 30 arcsecs respectively with Pendelloesung oscillations, which are the best reported to date. GaN with high crystallinity simultaneously exhibited high optical and electrical quality. Photoluminescence linewidth of GaN at 77K was as low as 17 meV, which is the best reported to date. Si-doped GaN had a mobility higher than 300 cm2/V.s. GaN has been also successfully grown on LiGaO2 substrate with LP-MOCVD for the first time. AlGaN for the entire composition range has been grown. These layers exhibited the lowest x-ray FWHM reported to date. The excellent optical quality of these layers have been characterized by room temperature UV transmission and photoluminescence. N-type doping of AlGaN with Si has ben achieved up to 60 percent Al with mobility as high as 78 cm2/V.s. AlxGa1-xN/AlyGa1-yN superlattice with atomically sharp interface have been demonstrated. Optically-pumped stimulated emission in GaN:Ge and GaN:Si has been observed with threshold optical power density as low as 0.4 MW/cm2. AlGaN photoconductors with cut-off wavelengths from 200 nm to 365 nm have been achieved for the first time. GaN p-n junction photovoltaic detector with very selective photoresponse have been demonstrated and theoretically modeled. Ti/AlN/Si metal-insulator- semiconductor capacitor with high capacitance-voltage performances at both low and high frequencies and low interface trap level density have been demonstrated for the first time in this material system.

Paper Details

Date Published: 13 June 1997
PDF: 10 pages
Proc. SPIE 3179, Solid State Crystals in Optoelectronics and Semiconductor Technology, (13 June 1997); doi: 10.1117/12.276195
Show Author Affiliations
Manijeh Razeghi, Northwestern Univ. (United States)
Xiaolong Zhang, Northwestern Univ. (United States)
Patrick Kung, Northwestern Univ. (United States)
Adam W. Saxler, Northwestern Univ. (United States)
Danielle Walker, Northwestern Univ. (United States)
Khee Yong Lim, Jeonbuk National Univ. (Singapore)
K. S. Kim, Jeonbuk National Univ. (United States)


Published in SPIE Proceedings Vol. 3179:
Solid State Crystals in Optoelectronics and Semiconductor Technology

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