Thermal dissociation of inter-layer excitons in MoS2/MoSe2 hetero-bilayers
Thermal dissociation of inter-layer excitons in MoS2/MoSe2 hetero-bilayers
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DOI：
10.1039/c7nr01598d
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发表时间：
2017-05-28
期刊：
影响因子：
6.7
通讯作者：
Matsuda, Kazunari
中科院分区：
文献类型：
--
作者：
Mouri, Shinichiro;Zhang, Wenjing;Matsuda, Kazunari
我们描述了光致发光（PL），PL激发，和时间分辨PL光谱的异质双层膜包括单层（1 L）的二硫化钼和MoSe 2在低温下。在100 K以下观察到一个衰减时间为2.5 ns的PL峰，这可以归因于1 L-MoS 2/1 L-MoSe 2异质双层膜中的层间激子发射。层间激子的结合能类似于90毫电子伏的确定从其热解离行为，从这个值得到的每一层的带偏移与先前报道的第一性原理计算是一致的。此外，层间带电激子（trions）的产生暗示从层间激子PL谱的栅极调制。
We describe photoluminescence (PL), PL excitation, and time-resolved PL spectroscopy of hetero-bilayers comprising monolayers (1L) of MoS2 and MoSe2 at cryogenic temperatures. A PL peak showing a decay time of 2.5 ns was observed below 100 K, which can be attributed to an inter-layer exciton emission in the 1L-MoS2/1L-MoSe2 hetero-bilayers. An inter-layer exciton binding energy of similar to 90 meV is determined from its thermal dissociation behavior; the band offset of each layer obtained from this value is consistent with previously reported first-principles calculations. Moreover, generation of inter-layer charged excitons (trions) is implied from the gate modulation of the inter-layer exciton PL spectra.