One-Dimensional Crystal-Structure Te–Se Alloy for Flexible Shortwave Infrared Photodetector and Imaging

Abstract

Flexible shortwave infrared detectors play a crucial role in wearable devices, bioimaging, automatic control, etc. Commercial shortwave infrared detectors face challenges in achieving flexibility due to the high fabrication temperature and rigid material properties. Herein, we develop a high-performance flexible Te 0.7 Se 0.3 photodetector, resulting from the unique 1D crystal structure and small elastic modulus of Te−Se alloying. The flexible photodetector exhibits a broadspectrum response ranging from 365 to 1650 nm, a fast response time of 6 μs, a broad linear dynamic range of 76 dB, and a specific detectivity of 4.8 × 10 10 Jones at room temperature. The responsivity of the flexible detector remains at 93% of its initial value after bending with a small curvature of 3 mm. Based on the optimized flexible detector, we demonstrate its application in shortwave infrared imaging. These results showcase the great potential of Te 0.7 Se 0.3 photodetectors for flexible electronics.