Tightly Bound Trions in Transition Metal Dichalcogenide Heterostructures
Tightly Bound Trions in Transition Metal Dichalcogenide Heterostructures
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DOI：
10.1021/acsnano.5b02144
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发表时间：
2015-06-01
期刊：
影响因子：
17.1
通讯作者：
Zhao, Hui
中科院分区：
文献类型：
--
作者：
Bellus, Matthew Z.;Ceballos, Frank;Zhao, Hui
本文报道了室温下由MoSe2和WS2非分子层组成的范德华异质结构中trions的观察。这些三角子是由WS2层激发的激子和MoSe2层转移的电子形成的。trions的重组在光致发光光谱中产生一个峰，这在未与MoSe2接触的单层WS2中是不存在的。峰的位置与激发强度的线性关系进一步证实了这个峰的三角起源。我们推导出零密度三角离子结合能为62兆电子伏特。在过渡金属二硫化物异质结构中，trion的形成促进了激子输运的电控制，可用于各种光电应用。
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.