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High Detectivity and Transparent Few‐Layer MoS 2 /Glassy‐Graphene Heterostructure Photodetectors
Author(s) -
Xu Hao,
Han Xiaoyu,
Dai Xiao,
Liu Wei,
Wu Jiang,
Zhu Juntong,
Kim Dongyoung,
Zou Guifu,
Sablon Kimberley A.,
Sergeev Andrei,
Guo Zhengxiao,
Liu Huiyun
Publication year - 2018
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.201706561
Subject(s) - materials science , photodetector , graphene , heterojunction , optoelectronics , responsivity , specific detectivity , ohmic contact , schottky barrier , layer (electronics) , nanotechnology , diode
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 MoS 2 /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 MoS 2 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 × 10 10 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.