期刊
ADVANCED FUNCTIONAL MATERIALS
卷 28, 期 47, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.201804388
关键词
MoSe2; photodetectors; sub-bandgap photodetection; van der Waals heterojunction; WSe2
类别
资金
- Academy of Finland [276376, 284548, 295777, 304666, 312297, 312551, 314810]
- TEKES (OPEC)
- European Union's Seventh Framework Program [631610]
- China Scholarship Council
- International Science and Technology Cooperation Project of China [2014DFR10780]
- Academy of Finland (AKA) [295777, 312297, 314810, 312551, 304666, 314810, 312551, 304666, 295777, 312297] Funding Source: Academy of Finland (AKA)
van der Waals (vdW) heterojunctions enable arbitrary combinations of different layered semiconductors with unique band structures, offering distinctive band engineering for photonic and optoelectronic devices with new functionalities and superior performance. Here, an interlayer photoresponse of a few-layer MoSe2/WSe2 vdW heterojunction is reported. With proper electrical gating and bias, the heterojunction exhibits high-sensitivity photodetection with the operation wavelength extended up to the telecommunication band (i.e. 1550 nm). The photoresponsivity and normalized photocurrent-to-dark current ratio reach up to 127 mA W-1 and 1.9 x 10(4) mW(-1), respectively. The results not only provide a promising solution to realize high-performance vdW telecommunication band photodetectors, but also pave the way for using sub-bandgap engineering of two-dimensional layered materials for photonic and optoelectronic applications.
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