Flexible and highly stable solar-blind photodetector based on room-temperature synthesis of amorphous Ga2O3 film

Abstract

Flexible photodetectors (PDs) have received enormous interest owing to their potential applications in portable information technology and modern wearable optoelectronic devices. Herein, flexible solar-blind PDs based on amorphous Ga2O3 films fabricated on polyethylene naphthalate substrates at room temperature are demonstrated. The PD yields a responsivity up to 3.7 mA W−1, a fast response speed of 80 ms, a large detectivity of 1.14 × 1012 Jones, a high ultraviolet/visible rejection ratio of 6.1 × 103, and an ultra-high photo-to-dark current ratio over 105 at 10 V, which is comparable to the performance of a device on a rigid substrate. Moreover, the device exhibits no obvious performance degradation even after mechanical bending over 103 cycles, indicating an excellent stability. Our results pave the route for the realization of high-performance solar-blind optoelectronics with a flexible substrate.