Integrated Flexible Ga2O3 Deep UV Photodetectors Powered by Environmental Electromagnetic Radiation Energy

This work reports an integrated flexible deep ultraviolet (UV) photodetection system hosting an amorphous Ga2O3 (a-Ga2O3) photodetector (PD) and an energy harvesting component including a receiving electrode and a full-wave rectifier. An alternating signal is induced by the coupling of human body with environmental electromagnetic radiation through human hand's contact with the receiving electrode. The signal is subsequently converted into direct current (DC) by the rectifier which is composed of four thin-film diodes with high rectification ratio (approximate to 10(6)) and fast response time (rising time approximate to 240 mu s and falling time approximate to 680 mu s). Driven by the DC output, the a-Ga2O3 PD achieves a photoresponsivity of 0.10 A W-1 and a detectivity of 2.24 x 10(11) Jones under 254 nm UV illumination. The integrated flexible a-Ga2O3 UV PD manifests a repeatable and pleasurable response behavior with a bending radius of 15 mm, providing a new paradigm for utilizing the environmental energy as the power source in wearable electronics.