3 years ago

High Detectivity and Transparent Few-Layer MoS2/Glassy-Graphene Heterostructure Photodetectors

High Detectivity and Transparent Few-Layer MoS2/Glassy-Graphene Heterostructure Photodetectors
Kimberley A. Sablon, Andrei Sergeev, Hao Xu, Huiyun Liu, Guifu Zou, Dongyoung Kim, Jiang Wu, Zhengxiao Guo, Wei Liu, Juntong Zhu, Xiao Dai, Xiaoyu Han
Layered van der Waals heterostructures have attracted considerable attention recently, due to their unique properties both inherited from individual two-dimensional (2D) components and imparted from their interactions. Here, a novel few-layer MoS2/glassy-graphene heterostructure, synthesized by a layer-by-layer transfer technique, and its application as transparent photodetectors are reported for the first time. Instead of a traditional Schottky junction, coherent ohmic contact is formed at the interface between the MoS2 and the glassy-graphene nanosheets. The device exhibits pronounced wavelength selectivity as illuminated by monochromatic lights. A responsivity of 12.3 mA W−1 and detectivity of 1.8 × 1010 Jones are obtained from the photodetector under 532 nm light illumination. Density functional theory calculations reveal the impact of specific carbon atomic arrangement in the glassy-graphene on the electronic band structure. It is demonstrated that the band alignment of the layered heterostructures can be manipulated by lattice engineering of 2D nanosheets to enhance optoelectronic performance. Transparent photodetectors based on a novel few-layer MoS2/glassy-graphene heterostructure which exhibit high detectivity and distinct wavelength selectivity, are reported. It is demonstrated that ohmic contact is formed at the heterojunction. Density functional theory calculations reveal the band alignment of the layered heterostructures can be manipulated by lattice engineering of 2D nanosheets to enhance optoelectronic performance.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/adma.201706561

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