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http://dx.doi.org/10.6111/JKCGCT.2015.25.2.056

The effects of growth temperatures and V/III ratios at 1000℃ for a-plane GaN epi-layer on r-plane sapphire grown by HVPE  

Ha, Ju-Hyung (Department of Materials and Component Engineering, Electronic Ceramics Center, Dong-Eui University)
Park, Mi-Seon (Department of Materials and Component Engineering, Electronic Ceramics Center, Dong-Eui University)
Lee, Won-Jae (Department of Materials and Component Engineering, Electronic Ceramics Center, Dong-Eui University)
Choi, Young-Jun (LumiGNtech Co., Ltd.)
Lee, Hae-Yong (LumiGNtech Co., Ltd.)
Abstract
The effects of the growth temperature on the properties of a-plane GaN epi-layer on r-plane sapphire by HVPE were studied, when the constant V/III ratio and the flow rate of HCl for the Ga source channel was fixed at 10 and 700 sccm, respectively. Additionally the effects of V/III ratios for source gasses were studied when growth temperature and the flow rate of HCl for the Ga source channel was fixed at $1000^{\circ}C$ and 700 sccm, respectively. As the growth temperature was increased, the values of Full Width Half Maximum (FWHM) for Rocking curve (RC) of a-plane GaN (11-20) epi-layer were decreased and thickness of a-plane GaN epi-layer were increased. As V/III ratios were increased at $1000^{\circ}C$, the values of FWHM for RC of a-plane GaN (11-20) were declined and thickness of a-plane GaN epi-layer were increased. The a-plane GaN (11-20) epi-layer grown at $1000^{\circ}C$ and V/III ratio = 10 showed the lowest value FWHM for RC of a-plane GaN (11-20) for 734 arcsec and the smallest dependence of Azimuth angle for FWHM of (11-20) RCs.
Keywords
a-Plane GaN; r-Plane sapphire; HVPE;
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