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

Abstract 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 (≈10⁶) and fast response time (rising time ≈240 µs and falling time ≈680 µs). Driven by the DC output, the a‐Ga₂O₃ PD achieves a photoresponsivity of 0.10 A W⁻¹ and a detectivity of 2.24 × 10¹¹ 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.