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Direct In Situ Growth of Centimeter-Scale Multi-Heterojunction MoS2/WS2/WSe2 Thin-Film Catalyst for Photo-Electrochemical Hydrogen Evolution.


ABSTRACT: To date, the in situ fabrication of the large-scale van der Waals multi-heterojunction transition metal dichalcogenides (multi-TMDs) is significantly challenging using conventional deposition methods. In this study, vertically stacked centimeter-scale multi-TMD (MoS2/WS2/WSe2 and MoS2/WSe2) thin films are successfully fabricated via sequential pulsed laser deposition (PLD), which is an in situ growth process. The fabricated MoS2/WS2/WSe2 thin film on p-type silicon (p-Si) substrate is designed to form multistaggered gaps (type-II band structure) with p-Si, and this film exhibits excellent spatial and thickness uniformity, which is verified by Raman spectroscopy. Among various application fields, MoS2/WS2/WSe2 is applied to the thin-film catalyst of a p-Si photocathode, to effectively transfer the photogenerated electrons from p-Si to the electrolyte in the photo-electrochemical (PEC) hydrogen evolution. From a comparison between the PEC performances of the homostructure TMDs (homo-TMDs)/p-Si and multi-TMDs/p-Si, it is demonstrated that the multistaggered gap of multi-TMDs/p-Si improves the PEC performance significantly more than the homo-TMDs/p-Si and bare p-Si by effective charge transfer. The new in situ growth process for the fabrication of multi-TMD thin films offers a novel and innovative method for the application of multi-TMD thin films to various fields.

SUBMITTER: Seo S 

PROVIDER: S-EPMC6662091 | biostudies-literature | 2019 Jul

REPOSITORIES: biostudies-literature

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Direct In Situ Growth of Centimeter-Scale Multi-Heterojunction MoS<sub>2</sub>/WS<sub>2</sub>/WSe<sub>2</sub> Thin-Film Catalyst for Photo-Electrochemical Hydrogen Evolution.

Seo Sehun S   Kim Seungkyu S   Choi Hojoong H   Lee Jongmin J   Yoon Hongji H   Piao Guangxia G   Park Jun-Cheol JC   Jung Yoonsung Y   Song Jaesun J   Jeong Sang Yun SY   Park Hyunwoong H   Lee Sanghan S  

Advanced science (Weinheim, Baden-Wurttemberg, Germany) 20190426 13


To date, the in situ fabrication of the large-scale van der Waals multi-heterojunction transition metal dichalcogenides (multi-TMDs) is significantly challenging using conventional deposition methods. In this study, vertically stacked centimeter-scale multi-TMD (MoS<sub>2</sub>/WS<sub>2</sub>/WSe<sub>2</sub> and MoS<sub>2</sub>/WSe<sub>2</sub>) thin films are successfully fabricated via sequential pulsed laser deposition (PLD), which is an in situ growth process. The fabricated MoS<sub>2</sub>/W  ...[more]

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