Solution-Processed Inorganic Perovskite Flexible Photodetectors with High Performance.

All inorganic CsPbIBr 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 CsPbIBr 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 CsPbIBr PDs and 100 μs/140 μs for CsPbIBr PDs), a high on/off ratio of 10, and a high detectivity about 10 Jones. Meanwhile, the devices showed outstanding environmental stability and mechanical flexibility. The periodic I-t curves had negligible fluctuation (< 5%) after storing in air atmosphere for 30 days or bending for 100 times. The results indicate that CsPbIBr perovskites have great potential in photodetection areas and pave the way to achieve high-performance flexible PDs.