Ultrasensitive solution-processed perovskite hybrid photodetectors

In this work, we demonstrate high performance photodetectors based on organometal halide perovskite materials in a conventional'' device architecture. Due to the excellent intrinsic optical and electrical properties of perovskite materials, high photoresponsivities from 375 nm to 800 nm were obtained. By additionally modifying a sol-gel processed TiO2 compact layer with a solution-processed [6,6]-phenyl-C-61-butyric acidmethyl ester (PC61BM), the performance of the perovskite photodetectors is further improved through simultaneously enhancing the photocurrent via facilitating the charge carrier transport at the CH3NH3PbI3/PC61BM interfaces, and suppressing the dark current densities by passivating the inhomogeneous TiO2 film. As a result, external quantum efficiencies over 80% and detectivities greater than 4 x 10(12) cm Hz(1/2) W-1 are obtained from 375 nm to 800 nm. In addition, on account of the conventional'' structure of the device, as well as the low-temperature solution-processed nature of each layer, our perovskite photodetectors exhibit much superior compatibility with large-scale commercialization methods.