文章基本信息

标题：High-Performance Few-layer Mo-doped ReSe₂ Nanosheet Photodetectors
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作者：Shengxue Yang ; Sefaattin Tongay ; Qu Yue 等
期刊名称：Scientific Reports
电子版ISSN：2045-2322
出版年度：2014
卷号：4
DOI：10.1038/srep05442
出版社：Springer Nature
摘要：Transition metal dichalcogenides (TMDCs) have recently been the focus of extensive research activity owing to their fascinating physical properties. As a new member of TMDCs, Mo doped ReSe₂ (Mo:ReSe₂) is an octahedral structure semiconductor being optically biaxial and highly anisotropic, different from most of hexagonal layered TMDCs with optically uniaxial and relatively high crystal symmetry. We investigated the effects of physisorption of gas molecule on the few-layer Mo:ReSe₂ nanosheet based photodetectors. We compared the photoresponse of the as-exfoliated device with annealed device both in air or ammonia (NH₃) environment. After annealing at sub-decomposition temperatures, the Mo:ReSe₂ photodetectors show a better photoresponsivity (~55.5 A/W) and higher EQE (10893%) in NH₃ than in air. By theoretical investigation, we conclude that the physisorption of NH₃ molecule on Mo:ReSe₂ monolayer can cause the charge transfer between NH₃ molecule and Mo:ReSe₂ monolayer, increasing the n-type carrier density of Mo:ReSe₂ monolayer. The prompt photoswitching, high photoresponsivity and different sensitivity to surrounding environment from the few-layer anisotropic Mo:ReSe₂ can be used to design multifunctional optoelectronic and sensing devices.