Toward Ultrahigh Sensitivity and UV–Vis–NIR Broadband Response of Organolead Halide Perovskite/Tin–Phthalocyanine Heterostructured Photodetectors

Organolead halide perovskite has recently emerged as a star material for various photoelectronic devices owing to its excellent optical and electronic properties. However, it is challenging to develop a perovskite-based photodetector with response across the UV–vis–NIR spectrum due to the lack of absorption in the NIR region for perovskite materials. Herein, we report a broadband photodetector based on the MAPbI3/SnPc heterostructure with mutual-complementary absorption spectra, extending the photoresponse from UV–vis to the NIR region because of the dominant absorption of the SnPc. The ultralow dark current of ∼0.01 nA is obtained and the ultrahigh photosensitivity is up to 105, which is attributed to the high dark resistance and the high electron injection barrier of the heterostructure, and the enhanced photoresponse by the heterostructure architecture. The outstanding sensitivity of our broadband photodetector can be comparable or superior to that of some inorganic, organic, and perovskite photodetectors reported previously. This work provides a route to designing high-performance broadband photodetectors with low noise and high sensitivity.