Photoluminescence properties and exciton dynamics in monolayer WSe2

被引：176

作者：

Yan, Tengfei ^{[1
]}

Qiao, Xiaofen ^{[1
]}

Liu, Xiaona ^{[1
]}

Tan, Pingheng ^{[1
]}

Zhang, Xinhui ^{[1
]}

机构：

[1] Chinese Acad Sci, Inst Semicond, State Key Lab Superlattices & Microstruct, POB 912, Beijing 100083, Peoples R China

来源：

APPLIED PHYSICS LETTERS | 2014年 / 105卷 / 10期

基金：

中国国家自然科学基金;

关键词：

QUANTUM-WELLS; VALLEY POLARIZATION; OPTICAL-ABSORPTION; CHARGED EXCITONS; CARRIER DYNAMICS; MOS2; COHERENCE; LIFETIMES; EMISSION; TRIONS;

D O I：

10.1063/1.4895471

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

In this work, comprehensive temperature and excitation power dependent photoluminescence and time-resolved photoluminescence studies are carried out on monolayer WSe2 to reveal its properties of exciton emissions and related excitonic dynamics. Competitions between the localized and delocalized exciton emissions, as well as the exciton and trion emissions are observed, respectively. These competitions are suggested to be responsible for the abnormal temperature and excitation intensity dependent photoluminescence properties. The radiative lifetimes of both excitons and trions exhibit linear dependence on temperature within the temperature regime below 260 K, providing further evidence for two-dimensional nature of monolayer material. (C) 2014 AIP Publishing LLC.

引用

页数：4

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