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Flexible Self-Powered Real-Time Ultraviolet Photodetector by Coupling Triboelectric and Photoelectric Effects
journal contribution
posted on 2020-03-18, 21:13 authored by Yi Zhang, Mingfa Peng, Yina Liu, Tingting Zhang, Qianqian Zhu, Hao Lei, Sainan Liu, Yi Tao, Long Li, Zhen Wen, Xuhui SunThe
portable UV photodetector is used to timely remind humans of
overexposure to UV radiation. However, the traditional UV photodetector
cannot meet the practical demands, and the power supply problem hinders
its further development. In this work, we demonstrated a flexible,
transparent, and self-powered UV photodetector by coupling of triboelectric
and photoelectric effects. The device integrates a flexible ZnO nanoparticle
(NP) UV photodetector, a transparent- and flexible-film-based TENG
(TFF-TENG), commercial chip resistors, and LEDs on the PET thin film.
The TFF-TENG could harvest mechanical energy from finger tapping and
sliding motion and power the ZnO NP UV photodetector to realize self-powered
detection. The voltage of the constant resistors connected with the
UV photodetector in series changes from 0.5 to 19 V under the UV light
with power intensities increasing from 0.46 to 21.8 mW/cm2, and the voltage variation is reflected by the number of LEDs directly.
The excellent flexibility and transparency of the device could extend
its application scenarios; for example, such a portable device could
be applied to real-time monitoring of the UV radiation to remind humans
of intense UV light.