Effects of V/III ratio on a-plane GaN epilayers with an InGaN interlayer

Effects of V/III ratio on a-plane GaN epilayers with an InGaN interlayer
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V/III 比对具有 InGaN 中间层的 a 面 GaN 外延层的影响

DOI:
10.1088/1674-1056/23/2/026801
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发表时间:
2014-02
期刊:
影响因子:
1.7
通讯作者:
Wang Zhan-Guo
Wang Zhan-Guo
中科院分区:
物理与天体物理3区
文献类型:
--
作者:
Wei Hong-Yuan;Jiao Chun-Mei;Zhu Qin-Sheng;Wang Zhan-Guo

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研究了 V/III 生长通量比对在具有 InGaN 中间层的 r 面蓝宝石衬底上生长的 a 面 GaN 薄膜的影响。研究发现表面形态、晶体质量、应变状态和基底层错密度在很大程度上取决于 V/III 比。随着V/III比的降低,表面形貌和晶体质量先改善后恶化,基面堆垛层错密度也先降低后增加。找到了a-GaN薄膜最佳表面形貌和晶体质量以及最小基面堆垛层错密度的最佳V/III比生长条件。我们还发现基面堆垛层错的形成是释放应变的有效途径。
The effects of V/III growth flux ratio on a-plane GaN films grown on r-plane sapphire substrates with an InGaN interlayer are investigated. The surface morphology, crystalline quality, strain states, and density of basal stacking faults were found to depend heavily upon the V/III ratio. With decreasing V/III ratio, the surface morphology and crystal quality first improved and then deteriorated, and the density of the basal-plane stacking faults also first decreased and then increased. The optimal V/III ratio growth condition for the best surface morphology and crystalline quality and the smallest basal-plane stacking fault density of a-GaN films are found. We also found that the formation of basal-plane stacking faults is an effective way to release strain.
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