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Enhancement-mode MOSFETs are pivotal components in electronics, distinguished by their capacity to act as highly efficient switches. They are part of the larger family of metal-oxide Semiconductor Field-Effect Transistors (MOSFETs). They are available in two types: p-channel and n-channel, each tailored to specific polarity operations.
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Channel-Length-Modulated Avalanche Multiplication in Ambipolar WSe2 Field-Effect Transistors.

Jaeyoung Kim1, Kyungjune Cho2, Jinsu Pak1

  • 1Department of Physics and Astronomy and Institute of Applied Physics, Seoul National University, Seoul 08826, Korea.

ACS Nano
|April 4, 2022
PubMed
Summary

Researchers developed a new method to analyze avalanche multiplication in ambipolar two-dimensional (2D) materials. This technique distinguishes carrier types, enabling better design of advanced electronic devices like transistors and photodetectors.

Keywords:
2D materialsWSe2ambipolar transportavalanche multiplicationfield-effect transistors

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Avalanche multiplication in two-dimensional (2D) materials is crucial for advanced devices.
  • Existing research primarily uses unipolar semiconductors, limiting analysis in ambipolar materials.
  • Understanding avalanche multiplication in ambipolar materials is essential for novel electronic architectures.

Purpose of the Study:

  • To develop a method for analyzing avalanche multiplication in ambipolar two-dimensional (2D) materials.
  • To distinguish between ambipolar transport and avalanche multiplication phenomena.
  • To analyze electron- and hole-initiated multiplication properties in ambipolar WSe2 field-effect transistors (FETs).

Main Methods:

  • Utilized channel length modulation to differentiate competing phenomena in ambipolar FETs.
  • Applied electrostatic gating for carrier-type tuning in 2D materials.
  • Investigated avalanche multiplication in WSe2 FETs.

Main Results:

  • Successfully distinguished ambipolar transport from avalanche multiplication.
  • Analyzed individual contributions of electron- and hole-initiated multiplication.
  • Demonstrated a robust method for studying carrier multiplication in ambipolar 2D materials.

Conclusions:

  • The developed method provides a simple and effective way to examine carrier multiplication in ambipolar materials.
  • This research will advance the development of high-performance atomically thin electronic devices.
  • Facilitates the design of next-generation devices utilizing avalanche multiplication in 2D materials.