title: Tunable GaTe-MoS2 van der Waals p-n Junctions with Novel Optoelectronic Performance.
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.
authors.affiliation: CAS Key Laboratory of Nanosystem and Hierarchical Fabrication, National Center for Nanoscience and Technology , Beijing 100190, China.|University of Chinese Academy of Sciences , No. 19A Yuquan Road, Beijing 100049, China.
authors.forename: Feng
authors.initials: F
authors.lastname: Wang
authors.affiliation: CAS Key Laboratory of Nanosystem and Hierarchical Fabrication, National Center for Nanoscience and Technology , Beijing 100190, China.
authors.forename: Zhenxing
authors.initials: Z
authors.lastname: Wang
authors.affiliation: CAS Key Laboratory of Nanosystem and Hierarchical Fabrication, National Center for Nanoscience and Technology , Beijing 100190, China.|University of Chinese Academy of Sciences , No. 19A Yuquan Road, Beijing 100049, China.
authors.forename: Kai
authors.initials: K
authors.lastname: Xu
authors.affiliation: CAS Key Laboratory of Nanosystem and Hierarchical Fabrication, National Center for Nanoscience and Technology , Beijing 100190, China.|University of Chinese Academy of Sciences , No. 19A Yuquan Road, Beijing 100049, China.
authors.forename: Fengmei
authors.initials: F
authors.lastname: Wang
authors.affiliation: CAS Key Laboratory of Nanosystem and Hierarchical Fabrication, National Center for Nanoscience and Technology , Beijing 100190, China.|University of Chinese Academy of Sciences , No. 19A Yuquan Road, Beijing 100049, China.
authors.forename: Qisheng
authors.initials: Q
authors.lastname: Wang
authors.affiliation: CAS Key Laboratory of Nanosystem and Hierarchical Fabrication, National Center for Nanoscience and Technology , Beijing 100190, China.|University of Chinese Academy of Sciences , No. 19A Yuquan Road, Beijing 100049, China.
authors.forename: Yun
authors.initials: Y
authors.lastname: Huang
authors.affiliation: CAS Key Laboratory of Nanosystem and Hierarchical Fabrication, National Center for Nanoscience and Technology , Beijing 100190, China.|University of Chinese Academy of Sciences , No. 19A Yuquan Road, Beijing 100049, China.
authors.forename: Lei
authors.initials: L
authors.lastname: Yin
authors.affiliation: CAS Key Laboratory of Nanosystem and Hierarchical Fabrication, National Center for Nanoscience and Technology , Beijing 100190, China.
authors.forename: Jun
authors.initials: J
authors.lastname: He
keywords: GaTe; MoS2; photodetection; photovoltaic effect; van der Waals heterostructure