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Unlocking the Performance Trade-off in Metal Phosphorus Trichalcogenides-Based Optoelectronics
Yibing Liu1, Yijun Huang1, Haotian Xu1
1Institute of Advanced Magnetic Materials, College of Materials and Environmental Engineering, Hangzhou Dianzi University, Hangzhou 310018, P. R. China.
ACS Applied Materials & Interfaces
|February 28, 2026
Summary
We developed a self-powered photodetector using a FePSe3/WSe2 heterojunction, achieving high performance for metal phosphorus trichalcogenide (MPT) devices. This breakthrough enables low-power, broadband optical sensing and communication without external power.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Nanotechnology
Background:
- Two-dimensional van der Waals heterojunctions are key for optoelectronics.
- Self-powered operation and high performance in metal phosphorus trichalcogenide (MPT) devices are challenging.
- Existing MPT photodetectors often underperform.
Purpose of the Study:
- To create an optimal type-I heterojunction for enhanced photodetector performance.
- To overcome the limitations of MPT-based devices.
- To demonstrate self-powered operation with high sensitivity and speed.
Main Methods:
- Fabrication of a FePSe3/WSe2 heterojunction with Se-terminated surfaces.
- Characterization of built-in potential using Kelvin probe force microscopy and ultraviolet photoelectron spectroscopy.
- Performance evaluation of the photodetector at zero bias, including responsivity, dark current, detectivity, and response time.
Main Results:
- An optimal type-I heterojunction with a 0.18 eV built-in potential was constructed.
- The photodetector achieved high responsivity (~59.1 mA/W), ultralow dark current (0.4 pA), and detectivity (1.2 × 10^11 Jones).
- Broadband sensitivity (250-950 nm), high on/off ratio (5.8 × 10^4), and rapid response (49.8 μs) were demonstrated.
Conclusions:
- The FePSe3/WSe2 heterojunction sets a new benchmark for MPT-based photodetectors.
- The device enables self-powered, high-performance operation for optoelectronic applications.
- This work provides a versatile platform for next-generation low-power imaging and sensing technologies.
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