Low-temperature study of neutral and charged excitons in the large-area monolayer WS2

被引：8
|
作者：
Gu, Hong [1 ,2 ]
Chen, Le [1 ]
Lu, Youming [1 ]
Tian, Feifei [3 ]
Zhang, Zhiqiang [3 ]
Xu, Ke [3 ]
Wu, Jing [4 ]
Botcha, V. Divakar [1 ,2 ]
Li, Kuilong [1 ,2 ]
Liu, Xinke [1 ]
机构：
[1] Shenzhen Univ, Chinese Engn & Res Inst Microelect, Shenzhen Key Lab Special Funct Mat, Coll Mat Sci & Engn,Guangdong Res Ctr Interfacial, Shenzhen 518060, Peoples R China
[2] Shenzhen Univ, Coll Optoelect Engn, Key Lab Optoelect Devices & Syst, Minist Educ & Guangdong Prov, Shenzhen 518060, Peoples R China
[3] Chinese Acad Sci, Suzhou Inst Nanotech & Nanobion, Suzhou 215123, Peoples R China
[4] Inst Mat Res & Engn, Singapore 138634, Singapore
来源：
JAPANESE JOURNAL OF APPLIED PHYSICS | 2018年 / 57卷 / 06期
基金：
中国国家自然科学基金;
关键词：
MOS2; PHOTOLUMINESCENCE; MULTILAYER; SULFUR; RAMAN;
D O I：
10.7567/JJAP.57.060309
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
We present a low-temperature optical study of the large-area monolayer WS2 grown by chemical vapor deposition (CVD). Power-dependent photoluminescence (PL) measurements were conducted, and temperature-dependent PL spectra were measured in the range of 3 to 300 K. With the comparative PL bands obtained, a stronger trion emission in the edge region was detected to be the key difference. Sulfur vacancies (SVs) were observed to increase in density along the growth direction and found to be the main source of the large population of local charge carriers. The monolayer WS2 exhibited an upper bound for the trion binding energy of 18 meV in the edge region. (C) 2018 The Japan Society of Applied Physics
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页数：4
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