Solution-Processed Ternary Perovskite-Organic Broadband Photodetectors with Ultrahigh Detectivity

Room temperature operated, solution-processed ultrasensitive broad-band photodetectors are widely used in various industrial companies in the scientific and medical sectors. Herein, we report solution-processed ultrahigh detectivity broadband photodetectors based on the ternary perovskite-organic composites. To ensure the photodetector based on perovskites has a photoresponse from the ultraviolet-visible to the near-infrared (NIR) region, low optical gap n-type conjugated organic molecules are incorporated with the three-dimensional (3D) perovskites mixed with the two-dimensional (2D) perovskites to form the ternary perovskite-organic composites, which possess an extended spectral response up to the NIR region and superior film characteristics compared to the 2D-3D mixed perovskite composites. Moreover, the photodetectors based on the ternary perovskite-organic composites exhibit enhanced photocurrent and suppressed dark current compared to those based on the 2D/3D mixed perovskite composites. As a result, at room temperature, the photodetectors based on the ternary perovskite-organic composites exhibit a spectral response from 375 to 1000 nm, whereas the photodetectors based on the 2D-3D mixed perovskite composites exhibit a spectral response from 375 to 800 nm. Furthermore, the photodetectors based on the ternary perovskite- organic composites have a photodetectivity over 10(15) cm Hz(1/2) W-1 (Jones) in the ultraviolet-visible region and over 10(13) Jones in the NIR region, a linear dynamic range over 110 dB, and a fast response time. All these results demonstrate that we developed a facile way to realize uncooled solution-processed ultrahigh detectivity broadband photodetectors based on the ternary perovskite-organic composites.

Automated summary

In this study, solution-processed ultrahigh detectivity broadband photodetectors based on ternary perovskite-organic composites were developed. By incorporating low optical gap n-type organic molecules into three-dimensional and two-dimensional perovskites, the photodetectors exhibited a broad spectral response from ultraviolet-visible to near-infrared region and showed improved film characteristics and enhanced photocurrent compared to the 2D/3D mixed perovskite composites.