Efficient Self-Driven Photodetectors Featuring a Mixed-Dimensional van der Waals Heterojunction Formed from a CdS Nanowire and a MoTe2 Flake
Efficient Self-Driven Photodetectors Featuring a Mixed-Dimensional van der Waals Heterojunction Formed from a CdS Nanowire and a MoTe2 Flake
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DOI：
10.1002/smll.201802302
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发表时间：
2018-10-04
期刊：
影响因子：
13.3
通讯作者：
Chen, Hsin-Ju
中科院分区：
文献类型：
--
作者：
Lu, Ming-Yen;Chang, Yung-Ting;Chen, Hsin-Ju
由低维材料形成的异质结可以导致光伏和光电探测器件显示出优异的物理性质和优异的性能。在此，一个混合维的货车德瓦尔斯（vdW）异质结包括一个一维的n型Ga掺杂的CdS纳米线和一个二维的p型MoTe 2薄片被证明;相应的光伏器件表现出突出的转换效率为15.01%的照射下，白色光在650 μ W cm（-2）。测量的电位差为80毫电子伏，使用开尔文探针力显微镜，在CdS-MoTe 2接口确认的光激发载流子的分离和积累时，照明。此外，零偏压下的vdW异质结器件的光电探测特性揭示了快速的响应时间（
Heterojunctions formed from low-dimensional materials can result in photovoltaic and photodetection devices displaying exceptional physical properties and excellent performance. Herein, a mixed-dimensional van der Waals (vdW) heterojunction comprising a 1D n-type Ga-doped CdS nanowire and a 2D p-type MoTe2 flake is demonstrated; the corresponding photovoltaic device exhibits an outstanding conversion efficiency of 15.01% under illumination with white light at 650 mu W cm(-2). A potential difference of 80 meV measured, using Kelvin probe force microscopy, at the CdS-MoTe2 interface confirms the separation and accumulation of photoexcited carriers upon illumination. Moreover, the photodetection characteristics of the vdW heterojunction device at zero bias reveal a rapid response time (