Ultrahigh-Gain Photodetectors Based on Atomically Thin Graphene-MoS2 Heterostructures

By Wenjing Zhang, Chih-Piao Chuu, Jing-Kai Huang, Chang-Hsiao Chen, M. Tsai, Yung‐Huang Chang, C. Liang, Yu-Ze Chen, Yu-Lun Chueh, Jr-hau He and 2 more. Scientific Reports, 2014

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Due to its high carrier mobility, broadband absorption and fast response time, the semi-metallic graphene is attractive for optoelectronics. Another two-dimensional semiconducting material molybdenum disulfide (MoS2) is also known as light- sensitive. Here we show that a large-area and continuous MoS2 monolayer is achievable using a CVD method and graphene is transferable onto MoS2. We demonstrate that a photodetector based on the graphene/MoS2 heterostructure is able to provide a high photogain greater than 108. Our experiments show that the electron-hole pairs are produced in the MoS2 layer after light absorption and subsequently separated across the layers. Contradictory to the expectation based on the conventional built-in electric field model for metal-semiconductor contacts, photoelectrons are injected into the graphene layer rather than trapped in MoS2 due to the presence of a perpendicular effective electric field caused by the combination of the built-in electric field, the applied electrostatic field and charged impurities or adsorbates, resulting in a tuneable photoresponsivity.

Subfields: Biomedical Engineering, Materials Chemistry

View Paper: https://www.semanticscholar.org/paper/c98e4e75690a9aac0c9e452452fdac9587f05d41

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Citations in the corpus

2D Saturable Absorbers for Fibre Lasers (2015, background): “In terms of wavelength coverage, Yb:fibre lasers have been mode-locked using MoS2 [33,44] and WS2 [53], Er:fibre lasers with MoS2 [34,39,45,46,75,76], WS2 [52–54,66], MoSe2 [56] and Tm:fibre lasers with MoS2 [49] and WS2 [51].”
Monolayer MoS2 heterojunction solar cells. (2014, background): “photogain greater than 10(8).(5) Phototransistors based on monolayer MoS2 have also been reported to exhibit a photoresponsivity as high as 2200 A W (1),(6) demonstrating the emerging applications of 2D materials for high-efficiency optoelectronic devices.”
Optoelectronic devices based on two-dimensional transition metal dichalcogenides (2016, background): “Another strategy to further improve the efficiency and photoresponsivity for this class of devices is to create heterojunctions of TMDC materials and other 2D materials such as MoS2/graphene [82, 83], WS2/graphene [45], and MoS2/carbon nanotubes (CNTs) [84].”
Graphene versus MoS2: A short review (2014, background): “As graphene and SLMoS2 have complementary physical properties, it is natural to combine graphene and SLMoS2 in specific ways to create heterostructures that mitigate any negative properties [25, 26, 187–197].”