Abstract
Organic-inorganic hybrid perovskite (OIHP) photodetectors that simultaneously achieve an ultrafast response and high sensitivity in the near-infrared (NIR) region are prerequisites for expanding current monitoring, imaging, and optical communication capbilities. Herein, we demonstrate photodetectors constructed by OIHP and an organic bulk heterojunction (BHJ) consisting of a low-bandgap nonfullerene and polymer, which achieve broadband response spectra up to 1 μm with a highest external quantum efficiency of approximately 54% at 850 nm, an ultrafast response speed of 5.6 ns and a linear dynamic range (LDR) of 191 dB. High sensitivity, ultrafast speed and a large LDR are preeminent prerequisites for the practical application of photodetectors. Encouragingly, due to the high-dynamic-range imaging capacity, high-quality visible-NIR actual imaging is achieved by employing the OIHP photodetectors. We believe that state-of-the-art OIHP photodetectors can accelerate the translation of solution-processed photodetector applications from the laboratory to the imaging market.
Highlights
Serving as technical functional components for the translation of optical signals into electrical signals, photodetectors have received extensive attention and have been applied in various fields, including industrial production, military affairs, biochemical detection, optical communication, and scientific research[1,2,3,4,5,6,7,8,9,10]
An organic bulk heterojunction (BHJ) consisting of PTB7-Th:F8IC is introduced into Organic-inorganic hybrid perovskite (OIHP) to structure photodetectors, yielding a broad external quantum efficiency (EQE) covering 1000 nm with a peak of 54% in the NIR region
The OIHP polycrystalline films were grown equably on PTAAmodified ITO conductive glass, and the F8IC:PTB7-Th film acted as an NIR light photosensitive layer on the OIHP active layer
Summary
Serving as technical functional components for the translation of optical signals into electrical signals, photodetectors have received extensive attention and have been applied in various fields, including industrial production, military affairs, biochemical detection, optical communication, and scientific research[1,2,3,4,5,6,7,8,9,10]. State-of-the-art OIHP broadband photodetectors should have a high EQE value in the NIR region, high sensitivity and an ultrafast response speed.
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