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Nano Lett. 2015 Nov 11;15(11):7558-66. doi: 10.1021/acs.nanolett.5b03291. Epub 2015 Oct 19.

Tunable GaTe-MoS2 van der Waals p-n Junctions with Novel Optoelectronic Performance.

Wang F1,2, Wang Z1, Xu K1,2, Wang F1,2, Wang Q1,2, Huang Y1,2, Yin L1,2, He J1.

Author information

1
CAS Key Laboratory of Nanosystem and Hierarchical Fabrication, National Center for Nanoscience and Technology , Beijing 100190, China.
2
University of Chinese Academy of Sciences , No. 19A Yuquan Road, Beijing 100049, China.

Abstract

P-n junctions based on vertically stacked van der Waals (vdW) materials have attracted a great deal of attention and may open up unforeseen opportunities in electronics and optoelectronics. However, due to the lack of intrinsic p-type vdW materials, most previous studies generally adopted electrical gating, special electrode contacts, or chemical doping methods to realize p-n vdW junctions. GaTe is an intrinsic p-type vdW material with a relatively high charge density, and it has a direct band gap that is independent of thickness. Here, we report the construction of ultrathin and tunable p-GaTe/n-MoS2 vdW heterostructure with high photovoltaic and photodetecting performance. The rectification ratio, external quantum efficiency, and photoresponsivity are as high as 4 × 10(5), 61.68%, and 21.83 AW(-1), respectively. In particular, the detectivity is up to 8.4 × 10(13) Jones, which is even higher than commercial Si, InGaAs photodetectors. This study demonstrates the promising potential of p-GaTe/n-MoS2 heterostructures for next-generation electronic and optoelectronic devices.

KEYWORDS:

GaTe; MoS2; photodetection; photovoltaic effect; van der Waals heterostructure

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