Atomically thin Schottky junction with a gap-mode plasmon for enhanced photoresponsivity in MoS2-based photodetectors

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Two-dimensional (2D) materials present various extraordinary properties that are advantageous in optoelectronic devices with atomically thin nature. Despite their excellent light-matter interaction, a low optical absorption that is proportional to thickness is considered to be a major limitation. In this study, a gap-mode plasmon structure is applied to the Schottky junction of Au-MoS2 to compensate for its low absorption. The magnitude of the gap-mode plasmon is generally known to be inversely proportional to the gap distance between two metal nanostructures; hence, an atomically thin 2D material can be considered to be a good candidate for a gap spacer. Owing to the gap-mode plasmon structure, the photoresponsivity of the proposed device is enhanced by approximately 11.6 times from 25 to 290 A W-1 under 1 nW of laser power, without photoresponse time degradation. Two operation modes, named the photovoltaic and the photoconductive mode, are also observed through different response times; these present different carrier transport mechanisms depending on the existence of bias voltage.
Publisher
IOP PUBLISHING LTD
Issue Date
2021-04
Language
English
Article Type
Article
Citation

JOURNAL OF PHYSICS D-APPLIED PHYSICS, v.54, no.14, pp.145301

ISSN
0022-3727
DOI
10.1088/1361-6463/abd6ac
URI
http://hdl.handle.net/10203/286439
Appears in Collection
EE-Journal Papers(저널논문)
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