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In Situ Imaging Reveals Efficient Charge Separation in Monolayer MoS2-WS2 Type-II Heterojunctions.

Qing Huang1,2, Ziyuan Wang3, Rujia Liu4

  • 1State Key Laboratory of Catalysis, Dalian National Laboratory for Clean Energy, iChEM, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Zhongshan Road 457, Dalian 116023, China.

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|February 20, 2026
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Summary

Two-dimensional transition metal dichalcogenide (TMD) heterojunctions enable efficient charge separation for photocatalysis. This study visualizes charge distribution in MoS2-WS2 in-plane heterojunctions, revealing key insights for solar energy applications.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Photocatalysis

Background:

  • Atomically sharp interfaces in 2D transition metal dichalcogenide (TMD) heterojunctions are promising for solar energy conversion and environmental remediation.
  • Understanding charge distribution and transport in these materials under operating conditions is crucial but challenging.

Purpose of the Study:

  • To directly visualize photoinduced charge separation in monolayer MoS2-WS2 in-plane heterojunctions.
  • To compare the charge-separation capacity of in-plane heterojunctions with vertical heterojunctions and individual monolayers.

Main Methods:

  • Photoscanning electrochemical microscopy (photo-SECM) was used to visualize charge separation.
  • High-resolution surface photovoltage microscopy (SPVM) quantified charge-separation capacity.
  • Ultraviolet photoelectron spectroscopy (UPS) and photoluminescence (PL) imaging provided insights into band alignment and recombination.

Main Results:

  • Electrons accumulated in MoS2 and holes in WS2 within the in-plane heterojunctions.
  • In-plane MoS2-WS2 heterojunctions exhibited superior photovoltage contrast compared to vertical heterojunctions and individual monolayers.
  • The interface acted as a recombination center, limiting carrier extraction.

Conclusions:

  • Direct experimental evidence of type-II band alignment driving directional charge separation in in-plane heterojunctions was established.
  • The study highlights the importance of interface design for optimizing photocatalytic and optoelectronic systems.
  • In-plane heterojunctions demonstrate significant potential for enhanced photocatalytic performance.