Large-area and cost-effective flexible Ga 2 O 3 based self-powered solar-blind ultraviolet photodetector prepared by scrape coating method

Abstract With the development of science and technology, wearable flexible devices have attracted more and more attention, but their development has been greatly limited due to the complex preparation process and high cost. In this work, a flexible large-area self-powered solar blind ultraviolet (UV) photodetector (SBPDs) with Ga 2 O 3 /Ti 3 C 2 Schottky contact was successfully constructed by a more cost-effective scrape coating method. The constructed Schottky junction greatly promotes the separation of carriers and the presence of Ti 3 C 2 also greatly reduces the charge transfer resistance. The detector has excellent self-powered response and excellent performance under UV irradiation at 0 V bias, with high responsivity (10.67 mA W −1 ), detectivity (17.80 * 10 8 jones) and fast response speed (0.07 s/0.08 s). Through bending experiments, it can also be proved that the detector has excellent robust characteristics and can still maintain 80% performance after 100 times of bending at 30° This work has developed a new idea for the preparation of large-area and cost-effective flexible SBPDs.