期刊
APPLIED PHYSICS LETTERS
卷 107, 期 18, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.4935028
关键词
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资金
- National Key Basic Research Program of China [2013CBA01604, 2015CB921600]
- National Natural Science Foundation of China [61325020, 61261160499, 11274154, 61521001, 61574074]
- MICM Laboratory Foundation [9140C140105140C14070]
- Priority Academic Program Development of Jiangsu Higher Education Institutions
- Jiangsu Shuangchuang program
- Jiangsu Shuangchuang Team Program
van der Waals (vdW) heterojunctions formed by two-dimensional (2D) materials have attracted tremendous attention due to their excellent electrical/optical properties and device applications. However, current 2D heterojunctions are largely limited to atomic crystals, and hybrid organic/inorganic structures are rarely explored. Here, we fabricate the hybrid 2D heterostructures with p-type dioctylbenzothienobenzothiophene (C-8-BTBT) and n-type MoS2. We find that few-layer C8-BTBT molecular crystals can be grown on monolayer MoS2 by vdW epitaxy, with pristine interface and controllable thickness down to monolayer. The operation of the C8-BTBT/MoS2 vertical heterojunction devices is highly tunable by bias and gate voltages between three different regimes: interfacial recombination, tunneling, and blocking. The pn junction shows diode-like behavior with rectifying ratio up to 10(5) at the room temperature. Our devices also exhibit photovoltaic responses with a power conversion efficiency of 0.31% and a photoresponsivity of 22 mA/W. With wide material combinations, such hybrid 2D structures will offer possibilities for opto-electronic devices that are not possible from individual constituents. (C) 2015 AIP Publishing LLC.
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