Solution-Processed Inorganic Perovskite Flexible Photodetectors with High Performance

All inorganic CsPbI 3-x Br x perovskites have been widely used in photodetectors due to their excellent optoelectronic properties and simple preparation processes. Here, high-performance flexible photodetectors based on inorganic CsPbI 3-x Br x perovskites are demonstrated, which are achieved by a modified solution-processed method. When biased at a low voltage of 10 mV, the device yielded fast response speeds (90 μs /110 μs for CsPbI 2 Br PDs and 100 μs/140 μs for CsPbIBr 2 PDs), a high on/off ratio of 10 4 , and a high detectivity about 10 12 Jones. Meanwhile, the devices showed outstanding environmental stability and mechanical flexibility. The periodic I-t curves had negligible fluctuation (