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Biasing a Junction Field Effect Transistor (JFET) is crucial for setting operational parameters and ensuring efficient functioning in electronic circuits. JFETs are characterized by using a single carrier type in N-channel or P-channel configurations, where the channel is surrounded by PN junctions. These junctions are central to the device's ability to control current flow.
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The contact of metal and semiconductor can lead to the formation of a junction with either Schottky or Ohmic behavior.
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Complementary Doping Strategy for Achieving Low Contact-Resistance in p-Type Two-Dimensional Field-Effect

Mayukh Das1, Krishnendu Mukhopadhyay1, Md Sajjad Alam2

  • 1Engineering Science and Mechanics, Penn State University, University Park, Pennsylvania 16802, United States.

Nano Letters
|December 21, 2025
PubMed
Summary
This summary is machine-generated.

Researchers reduced contact resistance in p-type two-dimensional (2D) field-effect transistors (FETs) using complementary doping and a van der Waals interface. This breakthrough enhances 2D FET performance for logic circuits.

Keywords:
2D materialsMOCVDdopinglarge-area WSe2low-contact-resistancep-type field-effect-transistor

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Semiconductor Physics

Background:

  • High-performance complementary logic circuits require low contact resistance (R_C) in two-dimensional (2D) field-effect transistors (FETs).
  • Achieving low R_C in p-type 2D FETs is challenging due to significant Schottky barriers for hole injection, unlike their n-type counterparts.

Purpose of the Study:

  • To reduce R_C in p-type monolayer WSe2 FETs to the sub-kΩ·μm range.
  • To engineer both the contact and channel regions for efficient hole injection.
  • To narrow the performance gap between n-type and p-type 2D transistors.

Main Methods:

  • Utilized degenerately Ta-doped multilayer MoSe2 as a p-type contact material laminated onto MOCVD-grown WSe2 channels.
  • Employed a postfabrication NO anneal for selective channel doping via NO chemisorption at Se-vacancy sites.
  • Combined complementary doping with a clean 2D/2D van der Waals (vdW) interface.

Main Results:

  • Achieved R_C in the sub-kΩ·μm range for p-type monolayer WSe2 FETs.
  • Demonstrated efficient hole injection, leading to high ON-current (I_ON) values up to 53 μA/μm.
  • Preserved the contact properties of the Ta-doped MoSe2 while doping the WSe2 channel.

Conclusions:

  • The presented strategy successfully reduces R_C in p-type 2D FETs by combining contact and channel engineering.
  • This approach significantly advances the development of complementary 2D logic technologies.
  • The method provides a pathway for balanced performance in n-type and p-type 2D transistors.