Abstract
Bismuth (Bi)-based perovskites are promising materials for near-ultraviolet-to-visible light (NUV–vis) detection. However, their practical application has been limited by relatively weak responsivity and detectivity. In this study, we developed a large-area, low-cost, environmentally friendly self-powered NUV–vis photodetector based on a ZnO/Cs3Bi2I9 heterojunction through a simple drop-coating method. Leveraging the pyroelectric effect, the device demonstrates a high responsivity of 10.48 mA/W, specific detectivity of 7.69 × 1010 Jones, and a fast rise time of 0.9 ms. Moreover, we elucidated the physical mechanism of the self-powered NUV–vis photodetector and systematically analyzed the influence of light power density on photoresponse and response time. This study introduces an effective strategy to enhance the performance of Bi-based perovskite photodetectors under zero voltage bias, leveraging the pyroelectric effect induced in ZnO under ultraviolet illumination and the photovoltaic effect of the Cs3Bi2I9 perovskite. The newly designed ultra-fast self-powered NUV–vis photodetector holds significant promise for diverse research and commercial applications.
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