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Updated: Feb 15, 2026
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Residue-Free Fabrication of van der Waals Heterostructures of Two-Dimensional Materials
Published on: July 18, 2025
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High-Performance Photovoltaic Detector Based on MoTe2 /MoS2 Van der Waals Heterostructure
Yan Chen1,2, Xudong Wang1, Guangjian Wu1
1State Key Laboratory of Infrared Physics, Shanghai Institute of Technical Physics, Chinese Academy of Sciences, 500 Yu Tian Road, Shanghai, 200083, China.
Small (Weinheim an Der Bergstrasse, Germany)
|January 23, 2018
Summary
High-performance photovoltaic photodetectors were created using molybdenum ditelluride/molybdenum disulfide (MoTe2/MoS2) vertical heterojunctions. These 2D material devices offer excellent on/off ratios and fast response times for advanced optoelectronics.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Nanotechnology
Background:
- Two-dimensional (2D) layered materials and van der Waals heterostructures are crucial for advanced optoelectronic devices.
- Applications include solar cells, light-emitting devices, and photodiodes, driving demand for novel device architectures.
Purpose of the Study:
- To demonstrate high-performance photovoltaic photodetectors using MoTe2/MoS2 vertical heterojunctions.
- To analyze the fundamental electric properties and band structures of these 2D material junctions.
Main Methods:
- Fabrication of MoTe2/MoS2 vertical heterojunctions via an exfoliating-restacking approach.
- Characterization of electrical properties, band structures, and optoelectronic performance at room temperature.
Main Results:
- Achieved photodetectors operating under zero bias with a high on/off ratio (>10^5) and ultralow dark current (approx. 3 pA).
- Demonstrated a fast response time of 60 µs and high photoresponsivity of 46 mA W^-1.
- Revealed fundamental electric properties and band structures of the MoTe2/MoS2 junction.
Conclusions:
- MoTe2/MoS2 vertical heterojunctions enable high-performance photovoltaic photodetectors.
- These 2D material junctions are promising for nanoscale electronic and optoelectronic applications.
- The exfoliating-restacking method provides an effective route for fabricating such devices.
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