Solution-Processed Inorganic Perovskite Flexible Photodetectors with High Performance

Abstract

All inorganic CsPbI_3-xBr_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-xBr_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 CsPbI₂Br PDs and 100 μs/140 μs for CsPbIBr₂ PDs), a high on/off ratio of 10⁴, and a high detectivity about 10¹² 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 CsPbI_3-xBr_x perovskites have great potential in photodetection areas and pave the way to achieve high-performance flexible PDs.