Xu, H; Han, X; Dai, X; Liu, W; Wu, J; Zhu, J; Kim, D; ... Liu, H; + view all Xu, H; Han, X; Dai, X; Liu, W; Wu, J; Zhu, J; Kim, D; Zou, G; Sablon, KA; Sergeev, A; Guo, Z; Liu, H; - view fewer (2018) High Detectivity and Transparent Few‐Layer MoS2/Glassy‐Graphene Heterostructure Photodetectors. Advanced Materials , 30 (13) , Article 1706561. 10.1002/adma.201706561.

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Abstract

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.

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