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Unlocking of Schottky Barrier near the Junction of MoS2 Heterostructure under Electrochemical Potential
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  • Kubra Aydin,
  • Mansu Kim,
  • Hyunho Seok,
  • Chulwoo Bae,
  • Muyoung Kim,
  • Jonghwan Park,
  • Joseph T. Hupp,
  • Dongmok Whang,
  • Hyeong-U Kim,
  • Taesung Kim
Kubra Aydin
Sungkyunkwan University - Natural Sciences Campus
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Mansu Kim
Northwestern University
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Hyunho Seok
Sungkyunkwan University - Natural Sciences Campus
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Chulwoo Bae
Sungkyunkwan University - Natural Sciences Campus
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Muyoung Kim
Korea Institute of Machinery & Materials
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Jonghwan Park
Sungkyunkwan University - Natural Sciences Campus
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Joseph T. Hupp
Northwestern University
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Dongmok Whang
Sungkyunkwan University - Natural Sciences Campus
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Hyeong-U Kim
Korea Institute of Machinery & Materials
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Taesung Kim
Sungkyunkwan University - Natural Sciences Campus

Corresponding Author:tkim@skku.edu

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Abstract

The exploration of heterostructures composed of two-dimensional (2D) transition metal dichalcogenide (TMDc) materials has garnered significant research attention due to the distinctive properties of each individual component and their phase-dependent unique properties. Using the plasma-enhanced chemical vapor deposition (PECVD) method, we analyze the fabrication of heterostructures consisting of two phases of molybdenum disulfide (MoS2) in four different cases. The initial hydrogen evolution reaction (HER) polarization curve indicates that the activity of the heterostructure MoS2 is consistent with that of the underlying MoS2, rather than the surface activity of the upper MoS2. This behavior can be attributed to an energy barrier arising from the physical contact resistance between the two different phases of MoS2 layers, which is mediated by van der Waals bonds. Remarkably, the energy barrier at the junction dissipates upon reaching a certain electrochemical potential, indicating surface activation from the top phase of MoS2 in the heterostructure. Notably, the 1T/2H MoS2 heterostructure demonstrates enhanced electrochemical stability compared to its metastable 1T-MoS2. This fundamental understanding paves the way for the creation of phase-controllable heterostructures through an experimentally viable PECVD, offering significant promise for a wide range of applications.
06 Mar 2024Submitted to Energy & Environmental Materials
12 Mar 2024Review(s) Completed, Editorial Evaluation Pending
13 Mar 2024Reviewer(s) Assigned
24 Mar 2024Editorial Decision: Revise Major
29 May 2024Assigned to Editor
29 May 2024Submission Checks Completed
29 May 2024Review(s) Completed, Editorial Evaluation Pending
29 May 2024Reviewer(s) Assigned
04 Jun 2024Editorial Decision: Accept