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Size-dependent optical properties of InGaN quantum dots in GaN nanowires grown by MBE |
Yanxiong E,Zhibiao HAO(),Jiadong YU,Chao WU,Lai WANG,Bing XIONG,Jian WANG,Yanjun HAN,Changzheng SUN,Yi LUO |
Tsinghua National Laboratory for Information Science and Technology, Department of Electronic Engineering, Tsinghua University, Beijing 100084, China |
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Abstract Quantum dots in nanowires (DINWs) are considered as important building blocks for novel nanoscale semiconductor optoelectronic devices. In this paper, pure axial heterojunction InGaN/GaN DINWs are grown by using plasma-assisted molecular beam epitaxy (PA-MBE) system. The InGaN quantum dots (QDs) are disk-like observed by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The diameter of QDs can be controlled by the growth conditions of nanowires (NWs), while the thickness of QDs can be controlled by the growth time of InGaN. Temperature-dependent photoluminescence (TDPL) measurements demonstrate that the PL peak of DINWs with small and uniform sizes shows a general red shift with increasing temperature. However, the PL peak of DINWs with non-uniform sizes shows an abnormal blue shift with increasing temperature, which is due to different internal quantum efficiencies of the DINWs with different sizes.
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Keywords
InGaN quantum dots (QDs)
nanowires (NWs)
photoluminescence (PL)
molecular beam epitaxy (MBE)
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Corresponding Author(s):
Zhibiao HAO
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Just Accepted Date: 22 February 2016
Online First Date: 29 March 2016
Issue Date: 05 April 2016
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