Growth behavior of GaN epilayers on Si(111) grown by GaN nanowires assisted epitaxial lateral overgrowth

被引:11
|
作者
Yeom, Bo-Ra [1 ]
Navamathavan, R. [1 ]
Park, Ji-Hyeon [1 ]
Ra, Yong-Ho [1 ]
Lee, Cheul-Ro [1 ]
机构
[1] Chonbuk Natl Univ, Sch Adv Mat Engn, RCAMD, Semicond Mat & Proc Lab, Jeonju 561756, South Korea
来源
CRYSTENGCOMM | 2012年 / 14卷 / 17期
基金
新加坡国家研究基金会;
关键词
A-PLANE GAN; CHEMICAL-VAPOR-DEPOSITION; SINGLE-CRYSTALLINE GAN; LIGHT-EMITTING-DIODES; HIGH-QUALITY GAN; INTERMEDIATE LAYER; GALLIUM NITRIDE; LASER-DIODES; THIN-FILMS; SUBSTRATE;
D O I
10.1039/c2ce25142f
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
We report on the growth behavior of high-quality GaN epilayers via GaN nanowires (NWs) assisted epitaxial lateral overgrowth (NWELOG) by using metalorganic chemical vapor deposition (MOCVD). Initially, an array of well-aligned GaN NWs were grown on Si(111) substrates via vapor-liquid-solid (VLS) method and then the successive lateral overgrowth of GaN epilayers using 4 step NWELOG at the upper part of the NWs. A thickness of GaN epilayer of about 5 to 6 mm was achieved. Transmission electron microscopy (TEM) study revealed a significant reduction of the dislocation density at the laterally coalesced GaN epilayers. A comparative analysis of atomic force microscopy (AFM), photoluminescence (PL) and X-ray diffraction (XRD) data of the GaN epilayer between NWELOG and lateral epitaxy on patterned substrates (LEPS) revealed that the NWELOG grown GaN epilayers were superior. From the AFM analysis, there were no surface pits on the GaN epilayers grown by the NWELOG process. The strong PL emission peak was observed at 365 nm for the GaN epilayer on Si(111). These results demonstrate that the NWELOG technique can improve the quality of GaN epilayers on Si substrates without surface crack generation or any related defects.
引用
收藏
页码:5558 / 5563
页数:6
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