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Integrated Flexible Ga 2 O 3 Deep UV Photodetectors Powered by Environmental Electromagnetic Radiation Energy
Author(s) -
Wang Tao,
Liang Huili,
Han Zuyin,
Sui Yanxin,
Mei Zengxia
Publication year - 2021
Publication title -
advanced materials technologies
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.184
H-Index - 42
ISSN - 2365-709X
DOI - 10.1002/admt.202000945
Subject(s) - optoelectronics , photodetection , photodetector , materials science , signal (programming language) , diode , energy harvesting , electromagnetic radiation , radiation , ultraviolet , dark current , energy (signal processing) , optics , physics , computer science , quantum mechanics , programming language
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.