Integrated Flexible Ga<sub>2</sub>O<sub>3</sub> Deep UV Photodetectors Powered by Environmental Electromagnetic Radiation Energy
Tao Wang, Huili Liang, Zuyin Han, Yanxin Sui, Zengxia Mei
Abstract
Abstract This work reports an integrated flexible deep ultraviolet (UV) photodetection system hosting an amorphous Ga 2 O 3 (a‐Ga 2 O 3 ) 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 (≈10 6 ) and fast response time (rising time ≈240 µs and falling time ≈680 µs). Driven by the DC output, the a‐Ga 2 O 3 PD achieves a photoresponsivity of 0.10 A W −1 and a detectivity of 2.24 × 10 11 Jones under 254 nm UV illumination. The integrated flexible a‐Ga 2 O 3 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.