Tightly Bound Trions in Transition Metal Dichalcogenide Heterostructures

被引：106

作者：

Bellus, Matthew Z. ^{[1
]}

Ceballos, Frank ^{[1
]}

Chiu, Hsin-Ying ^{[1
]}

Zhao, Hui ^{[1
]}

机构：

[1] Univ Kansas, Dept Phys & Astron, Lawrence, KS 66045 USA

来源：

ACS NANO | 2015年 / 9卷 / 06期

基金：

美国国家科学基金会;

关键词：

transition metal dichalcogenides; van der Waals heterostructure; exciton; trion; charge transfer; photoluminescence; VALLEY COHERENCE; MONOLAYER MOS2; WAALS; GENERATION; PHOTOLUMINESCENCE; EXCITONS; FILMS;

D O I：

10.1021/acsnano.5b02144

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

We report the observation of trions at room temperature in a van der Waals heterostructure composed of MoSe2 and WS2 nnonolayers. These trions are formed by excitons excited in the WS2 layer and electrons transferred from the MoSe2 layer. Recombination of trions results in a peak in the photoluminescence spectra, which is absent in monolayer WS2 that is not in contact with MoSe2. The trion origin of this peak is further confirmed by the linear dependence of the peak position on excitation intensity. We deduced a zero-density trion binding energy of 62 meV. The trion formation facilitates electrical control of exciton transport in transition metal dichalcogenide heterostructures, which can be utilized in various optoelectronic applications.

引用

页码：6459 / 6464

页数：6

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