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A Dual-Gate MoS2 Photodetector Based on Interface Coupling Effect.

Fuyou Liao1, Jianan Deng2, Xinyu Chen1

  • 1State Key Laboratory of ASIC and System, School of Microelectronics, Fudan University, Shanghai, 200433, China.

Small (Weinheim an Der Bergstrasse, Germany)
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PubMed
Summary
This summary is machine-generated.

This study introduces a dual-gated molybdenum disulfide (MoS2) phototransistor that utilizes interface coupling effects (ICE) for enhanced performance. This novel design achieves ultrahigh responsivity and detectivity, overcoming limitations of traditional photodetectors.

Keywords:
MoS2interface couplingphotogating effectphototransistors

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Optoelectronics

Background:

  • 2D transition metal dichalcogenides (TMDs) like MoS2 show promise for optoelectronics.
  • Existing MoS2 photodetectors often rely on photogating effects, limiting control and performance (responsivity, speed, dark current).

Purpose of the Study:

  • To demonstrate a dual-gated (DG) MoS2 phototransistor operating via interface coupling effect (ICE).
  • To investigate the impact of ICE on photoelectric performance and overcome limitations of previous designs.

Main Methods:

  • Fabrication of a dual-gated MoS2 phototransistor.
  • Application of simultaneous negative top-gate (V_TG) and positive back-gate (V_BG) voltages.
  • Characterization of device performance under varying conditions.

Main Results:

  • Achieved ultrahigh responsivity (R) of ~10^5 A/W and detectivity (D*) of ~10^14 Jones.
  • Demonstrated modulation of response time via ICE.
  • Showcased effective trapping of photogenerated holes in the depleted region under TG.

Conclusions:

  • Interface coupling effect (ICE) significantly modulates photoelectric performance in MoS2 DG phototransistors.
  • This work paves the way for advanced 2D TMDs optoelectrical applications.
  • Further research into DG structured phototransistors is warranted.