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Two-Dimensional 2H-TaS2 Contact for Fermi-Level Pinning-Free P-Type WSe2 Field-Effect Transistors.

Delong Cui1, Shuwen Shen1, Wenxuan Wu1

  • 1College of Future Information Technology, Fudan University, Shanghai 200433, China.

ACS Applied Materials & Interfaces
|September 20, 2025
PubMed
Summary
This summary is machine-generated.

This study introduces a new method using 2D tantalum disulfide (TaS2) contacts to achieve stable p-type conductivity in tungsten diselenide (WSe2) field-effect transistors. This breakthrough overcomes Fermi-level pinning for advanced 2D electronics.

Keywords:
Fermi-level pinningTaS2 contactWSe2field-effect transistorsp-type

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Two-dimensional (2D) transition metal dichalcogenides (TMDs) like WSe2 are promising for semiconductor and optoelectronic devices.
  • Achieving stable p-type conductivity in 2D TMDs is difficult due to Fermi-level pinning at metal contacts.

Purpose of the Study:

  • To develop Fermi-level pinning-free WSe2 field-effect transistors (FETs) using 2D van der Waals contacts.
  • To enable reliable p-type and n-type contacts for 2D material-based electronics.

Main Methods:

  • Fabrication of WSe2 FETs utilizing atomically flat 2H-TaS2 as van der Waals contacts.
  • Characterization of the WSe2/2H-TaS2 interface and its effect on charge transport properties.
  • Measurement of device performance, including hole mobility and on/off current ratio.

Main Results:

  • Demonstrated Fermi-level pinning-free contacts with a pinning factor of 0.95, adhering to the Schottky-Mott rule.
  • Achieved stable p-type WSe2 FETs with dominant hole transport, exhibiting a hole mobility of 23.74 cm^2 V^-1 s^-1 and an on/off ratio of 1x10^7.
  • Confirmed the robustness of the p-type polarity irrespective of WSe2 thickness.

Conclusions:

  • 2D TaS2 contacts effectively eliminate Fermi-level pinning in WSe2 FETs.
  • This interface engineering strategy provides a viable route for realizing high-performance p-type 2D transistors.
  • The findings pave the way for next-generation logic electronics based on 2D materials.