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Updated: May 21, 2025
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Infrared Degenerate Four-wave Mixing with Upconversion Detection for Quantitative Gas Sensing
Published on: March 22, 2019
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van der Waals Complementary Barrier Infrared Detector.
Xiangbao Xu1, Jiachang Chen1,2, Haitao Wu1,2
1Hangzhou Institute for Advanced Study, University of Chinese Academy of Sciences, Hangzhou 310024, China.
ACS Nano
|May 12, 2025
Summary
Researchers developed a novel van der Waals complementary barrier infrared detector (CBD) that significantly reduces dark current. This uncooled infrared photodetector achieves high performance for infrared detection, polarization sensing, and gas detection at room temperature.
Area of Science:
- Optoelectronics
- Materials Science
- Nanotechnology
Background:
- Uncooled infrared photodetectors are crucial for various applications.
- High dark current in narrow-bandgap materials limits performance.
- Thermal carrier excitation is a major challenge for infrared photodetector sensitivity.
Purpose of the Study:
- To propose a van der Waals (vdW) complementary barrier infrared detector (CBD).
- To overcome the limitations of high dark current in uncooled infrared photodetectors.
- To achieve high-performance infrared detection, polarization sensing, and gas detection.
Main Methods:
- Fabrication of a vdW CBD using gold/black phosphorus (Au/BP) Schottky contact and molybdenum disulfide (MoS2).
- Characterization of dark current, infrared response, and gate-tunable properties.
- Evaluation of infrared polarization detection and nondispersive infrared (NDIR) gas sensing capabilities.
Main Results:
- Achieved a low dark current of 0.1 μA at -0.1 V, suppressing diffusion dark current.
- Demonstrated a peak detectivity of 8.37 × 10^9 cm Hz^1/2 W^-1 under blackbody radiation at room temperature.
- Exhibited strong infrared polarization detection (anisotropy ratio of 13.9) and sensitive NDIR methane detection (limit of 23.9 ppm).
Conclusions:
- The vdW CBD effectively suppresses dark current for high-performance infrared detection.
- The device offers gate-tunable infrared response and polarization sensitivity.
- This work presents a promising strategy for room-temperature, high-performance vdW infrared photodetectors.
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