Toward High Uniformity of Photoresponse Broadband Hybrid Organic-Inorganic Photodiode Based on PVP-Modified Perovskite.

Abstract: Broadband photodiode based on Si/perovskite structure that combines the advantages of both silicon and perovskite is presented in this paper. This study addresses the issue of the absent of ultraviolet absorption of silicon and the near‐infrared absorption of perovskite. More significantly, the polyvinyl pyrrolidone (PVP) modification process on the perovskite film shows efficiency on morphology and crystallizing control that are important for high uniformity of responsivity and reproducibility. The result shows high spectral uniformity of responsivity (uSR = 0.85) on a wide spectrum ranging from 405 to 808 nm and the average of deviation of reproducibility is only 2.1%. Fast response time (645 µs), good on–off switching performance, and high photosensitivity (Ion/Ioff = 1322) of the as‐fabricated device are also achieved in this work. This research indicates that the high‐performance broadband photodiode can be realized by the novel organic–inorganic structure and PVP modification without compromising any of its performance. [ABSTRACT FROM AUTHOR]