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Anomalous Light-Induced Charging in MoS2 Monolayers with Cracks

Title
Anomalous Light-Induced Charging in MoS2 Monolayers with Cracks
Authors
Choi, HyejiKwon, SoyeongSong, JungeunLim, JaerangAn, BojungChoi, Soo HoKim, Ki KangPark, Hyeong-HoKim, Dong-Wook
Ewha Authors
김동욱
SCOPUS Author ID
김동욱scopus
Issue Date
2021
Journal Title
ACS APPLIED ELECTRONIC MATERIALS
ISSN
2637-6113JCR Link
Citation
ACS APPLIED ELECTRONIC MATERIALS vol. 3, no. 12, pp. 5265 - 5271
Keywords
MoS2crackstraincharging photocurrent
Publisher
AMER CHEMICAL SOC
Indexed
SCIE; SCOPUS WOS scopus
Document Type
Article
Abstract
( )Monolayer MoS2 devices with Au electrodes were fabricated on SiO2/Si substrates with 50 nm high SiO2 nanopillar (NP) array patterns. In the NP patterns, many cracks were found in the MoS2 flakes, which were generated by the NP-induced mechanical strain during the wet transfer process. The cracks broke a few tens of micrometer MoS(2 )flakes, producing micrometer-sized flakes. Some of the small MoS2 flakes were suspended over the NPs, and others were not. The suspended flakes were highly strained, but the nonsuspended flakes were unstrained. Lightinduced charging behaviors at the MoS2 flakes on the NPs were distinct from those on flat SiO2 . More interestingly, positive and negative charging of an identical flake could be observed during repeated light on-and-off cycles. The strain-induced potential gradient in the MoS2 flakes on the NPs could cause exciton dissociation and charge migration under illumination, giving rise to light-induced charging. The polarity and amount of charges could be determined by the strain states and initial net charges of a specific flake and its neighboring flakes.
DOI
10.1021/acsaelm.1c00773
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자연과학대학 > 물리학전공 > Journal papers
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