Optical spectroscopy reveals transition of CuInS2/ZnS to CuxZn1-xInS2/ZnS:Cu alloyed quantum dots with resultant double-defect luminescence

被引：12

作者：

Yan, Ruolin ^{[1
]}

Zhang, Wenxia ^{[1
]}

Wu, Wenhui ^{[1
]}

Dong, Xingmin ^{[1
]}

Wang, Qiqi ^{[1
]}

Fan, Jiyang ^{[1
]}

机构：

[1] Southeast Univ, Dept Phys, Nanjing 211189, Jiangsu, Peoples R China

来源：

APL MATERIALS | 2016年 / 4卷 / 12期

基金：

中国国家自然科学基金;

关键词：

ELECTRONIC-STRUCTURE; CATION-EXCHANGE; BAND TAILS; NANOCRYSTALS; PHOTOLUMINESCENCE; NANOPARTICLES; TRANSFORMATION; RECOMBINATION; PERFORMANCE;

D O I：

10.1063/1.4971353

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

The structure and luminescence mechanisms of the CuInS2 quantum dots (QDs) after epitaxial growth of ZnS shell are in debate. The light absorption/emission spectroscopy reveals that after ZnS shell growth the cation diffusion at the CuInS2/ZnS interface results in formation of the alloyed CuInS2/ZnS to CuxZn1-xInS2/ZnS:Cu QDs. These core/shell QDs exhibit dual-color photoluminescence with abnormal blue shift with decreasing excitation photon energy. The results show that the green and orange emissions originate separately from defects in the core and the shell. The absorption tail of the ZnS QDs turns from Urbach to Halperin-Lax type after Cu doping. (C) 2016 Author(s).

引用

页数：7

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