High-performing UV photodetectors by thermal-coupling transparent photovoltaics
- Authors
- Nguyen, T.T.[Nguyen, T.T.]; Kim, J.[Kim, J.]; Yi, J.[Yi, J.]; Wong, C.-P.[Wong, C.-P.]
- Issue Date
- Sep-2022
- Publisher
- Elsevier Ltd
- Keywords
- Heat control; Heterojunction; Pyroelectrics; Self-powered photodetector; Thermal conductivity; Transparent photovoltaics
- Citation
- Nano Energy, v.100
- Indexed
- SCIE
SCOPUS
- Journal Title
- Nano Energy
- Volume
- 100
- URI
- https://scholarworks.bwise.kr/skku/handle/2021.sw.skku/99383
- DOI
- 10.1016/j.nanoen.2022.107504
- ISSN
- 2211-2855
- Abstract
- Understanding of light-driven electric power (photovoltaics) and thermally–induced electric (pyroelectric) effect is crucial for the next-generation of optoelectronics, emphasizing sustainability and portability with improved performance. Herein, we report the high-performing thermal-coupling transparent photovoltaics for ultrafast photodetection. Optically transparent photovoltaic device has p–n heterojunction, with n-ZnO and two different p-type metal oxides (Cu2O or NiO). The ZnO based photodetector is highly transparent with average visible transmittance of 51%. Importantly, significant enhancement of device sensitivity toward ultraviolet (UV) light (λ = 365 nm) is obtained via tuning the pyroelectric effect of ZnO. The pyro-current is originated from polarization charges due to thermal variation, thus the control of heat flow in ZnO is the origin to enhance pyro-current. The lower thermal conductivity of Cu2O (4.5 W m−1 K−1) is more effective rather than the case of NiO to shape the well-confined heat in ZnO thermal reservoir, resulting in the significantly enhanced pyro-current (176.3%). The transparent ZnO/Cu2O photodetector exhibits the extremely-high responsivity of 0.98 A W−1 and detectivity of 1.62 × 1013 Jones, with μs response speed at zero bias condition due to the photovoltaic operation. This will bring the self-support transparent electronics for versatile see-through platforms without bulky power system. One day people will get information quickly and wireless without loss of vision. © 2022 Elsevier Ltd
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