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A Flexible Dual-Mode Photodetector for Human-Machine Collaborative IR Imaging.
Huajing Fang1, Xinxing Xie2, Kai Jing2
1Center for Advancing Materials Performance From the Nanoscale (CAMP‑Nano), State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an, 710049, People's Republic of China. fanghj@xjtu.edu.cn.
Nano-Micro Letters
|April 24, 2025
Summary
This study introduces a flexible photodetector using MXene thin films for dual-mode infrared imaging. The device offers self-powered, uncooled operation and enables human-machine collaboration.
Area of Science:
- Materials Science
- Optoelectronics
- Nanotechnology
Background:
- Photothermoelectric (PTE) photodetectors offer self-powered, uncooled operation for various applications.
- Traditional PTE devices lack mechanical flexibility and independent functionality.
- There is a need for advanced photodetectors with enhanced performance and new functionalities.
Purpose of the Study:
- To develop a flexible PTE photodetector with dual-mode electrical and optical output.
- To enhance responsivity and flexibility of PTE devices.
- To demonstrate a human-machine collaborative infrared imaging system.
Main Methods:
- Solution processing of high-quality MXene thin films on asymmetric electrodes.
- Utilizing geometrically asymmetric electrodes to optimize photothermal conversion and temperature gradient.
- Coupling MXene photothermal conversion with thermochromic materials for optical signal generation.
Main Results:
- Achieved a responsivity of 0.33 mA W⁻¹ under infrared illumination, doubling that of symmetric configurations.
- Demonstrated excellent mechanical flexibility, maintaining stable performance after 300 bending cycles.
- Successfully developed a dual-mode output system for real-time infrared visualization and human-machine collaborative imaging.
Conclusions:
- The flexible, dual-mode PTE photodetector offers enhanced functionality and performance.
- Asymmetric electrode design is crucial for improving PTE device responsivity.
- This work establishes a new benchmark for flexible photodetectors and human-machine collaborative optoelectronics.
