Browsing by Author "Yang, Ya-Yu"

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Double superstructures in InGaN/GaN nano-pyramid arrays
(2015-10-01)
Chang, Chiao-Yun
;
Li, Heng
;
Hong, Kuo-Bin
;
Yang, Ya-Yu
;
Lai, Wei-Chih
We have fabricated and investigated InGaN/GaN nanopyramid arrays grown on c-plane sapphire by selective area growth technique. The double InGaN/GaN superstructures were formed in one GaN pyramid observed in transmittance emission microscopy. The two growth faces on GaN nanopyramind showed different growth rates, resulted in double superheterostructures of semi-polar facets for InGaN/GaN multiple quantum wells (MQWs) and c-plane InGaN/GaN nano-hetero-disk (NHD) under the nanoscale growth condition. The c-plane InGaN/GaN NHD had high Indium composition due to the pulling effect, exhibiting double wavelength emissions from GaN nanopyramid. And InGaN/GaN MQWs and c-plane InGaN/GaN NHD showed extremely low quantum confinement Stark effect, yielding great light emission efficiency. This result is beneficial for the development of blue, green and white light-emitting diodes. (C) 2015 Elsevier Ltd. All rights reserved.