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Self-powered high responsivity ultraviolet radiation sensor by coupling ZnO based piezoelectric nanogenerator and photodetector.
- Source :
-
Applied Physics Letters . 3/4/2024, Vol. 124 Issue 10, p1-7. 7p. - Publication Year :
- 2024
-
Abstract
- A self-powered UV sensor with high responsivity was developed by coupling ZnO based piezoelectric nanogenerator and photodetector for uninterrupted real-time monitoring of UV radiation. Unlike conventional UV photodetectors, our approach couples a ZnO based metal-semiconductor-metal photodetector as a variable load resistor with a flexible ZnO:PVDF piezoelectric nanogenerator through impedance matching to realize self-powering of photodetector. The as fabricated UV photodetector exhibits a dark resistance of approximately 55 MΩ and change of resistance from 12 to 2 MΩ in response to UV illumination ranging from 1.5 to 14.5 mW/cm2. Under UV exposure of 1.5 mW/cm2, the output voltage of self-powered UV sensor drops from ∼14.6 V (dark) to ∼3.88 V. With increasing UV intensity from 1.5 to 14.5 mW/cm2, the output voltage gradually decreases from ∼3.88 to ∼1.04 V due to reduced ZnO photodetector resistance. This self-powered UV sensor exhibits excellent performance with a sensitivity of ∼93%, a voltage responsivity of 7.14 V (mW−1 cm−2), a response time of 0.67 s, and a recovery time of 4 s, which are better than the previous reports. The environmentally stable and biocompatible nature of ZnO based system makes it a promising candidate for self-powered real time ultraviolet remote sensing applications. [ABSTRACT FROM AUTHOR]
- Subjects :
- *PHOTODETECTORS
*VARISTORS
*REMOTE sensing
*ZINC oxide
*IMPEDANCE matching
Subjects
Details
- Language :
- English
- ISSN :
- 00036951
- Volume :
- 124
- Issue :
- 10
- Database :
- Academic Search Index
- Journal :
- Applied Physics Letters
- Publication Type :
- Academic Journal
- Accession number :
- 175939743
- Full Text :
- https://doi.org/10.1063/5.0191001