Surface molecular engineering of CsPbBr3 perovskite nanosheets for high-performance photodetector

Photodetectors that can directly convert optical signals into electrical signals offer great application prospects in next-generation optoelectronic nanodevices. But to-date, unsatisfactory light absorption and charge carrier separation efficiency still limit their applications. Herein, we developed a facile and low-cost surface molecular engineering strategy to construct high-performance photodetector with CsPbBr3 perovskite nanosheets. Because of the improved optical absorption and charge transfer behavior, CsPbBr3/poly(3-hexylthiophene) (P3HT) film photodetector presents a fast response speed, excellent stability and reproducibility. We anticipate that our results not only demonstrate the effectiveness of surface molecular engineering in film photodetector design, but also provide a facile and cost-effective strategy applicable for broadband light optical sensor production.