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Interface Engineering with Graphene Contacts in VP/MoS2 Heterostructures for High-Performance, Durable, and

Waqas Ahmad1, Umer Younis2, Muhammad Zubair Nawaz3

  • 1Laboratory of 2D Optoelectronics and Nanoelectronics (L2DON), State Key Laboratory of Quantum Functional Materials, Department of Materials Science and Engineering, Southern University of Science and Technology, 1088 Xueyuan Blvd, Shenzhen 518055, China.

ACS Applied Materials & Interfaces
|March 11, 2026
PubMed
Summary
This summary is machine-generated.

We developed a novel few-layer graphene/violet phosphorus/MoS2 (FLG/VP/MoS2) van der Waals heterostructure photodetector. This device shows exceptional broadband photodetection from UV to NIR with high responsivity and stability.

Keywords:
2D materialsheterostructuresphotodetectorsresponsivityviolet phosphorus

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Area of Science:

  • Materials Science
  • Optoelectronics
  • Nanotechnology

Background:

  • Efficient photocarrier separation is crucial for high-performance photodetectors.
  • Van der Waals (vdWs) heterostructures offer tunable interfaces for enhanced device performance.
  • Engineering built-in electric fields in vdWs heterostructures maximizes device efficiency.

Purpose of the Study:

  • To present a high-performance photodetector utilizing a vertically stacked few-layer graphene/violet phosphorus/MoS2 (FLG/VP/MoS2) vdWs heterostructure.
  • To demonstrate enhanced photodetection across a broad spectral range (UV to near-infrared).
  • To investigate the device's responsivity, quantum efficiency, photoresponse speed, polarization sensitivity, and operational durability.

Main Methods:

  • Fabrication of a vertically stacked FLG/VP/MoS2 vdWs heterostructure.
  • Characterization of photodetection performance across UV, visible, and near-infrared spectra.
  • Measurement of key device parameters: responsivity, external quantum efficiency, rise time, and dichroic ratio.
  • First-principles calculations to analyze interface coupling and structural stability.

Main Results:

  • The FLG/VP/MoS2 photodetector achieved ultra-high responsivity (up to 8.8 × 10^4 A/W) and external quantum efficiency (1.81 × 10^7%), exceeding bare VP/MoS2 devices by over 5 orders of magnitude.
  • Demonstrated broadband photodetection from 275 nm (UV) to 808 nm (near-infrared).
  • Exhibited a fast photoresponse (rise time ~1.5 ms), notable polarization sensitivity (dichroic ratio ~1.075), and excellent operational durability (>100 on-off cycles).

Conclusions:

  • The FLG/VP/MoS2 vdWs heterostructure is a promising platform for high-performance, broadband, and polarization-sensitive photodetection.
  • Strong interlayer coupling and structural stability at the device interface contribute to its enhanced performance and durability.
  • This work paves the way for advanced optoelectronic applications requiring sensitive and versatile photodetection.