All-inorganic perovskite nanowires-InGaZnO heterojunction for high-performance ultraviolet-visible photodetectors.

Inorganic cesium lead halide perovskites have attracted intense interest in optoelectronic applica-tions due to the relatively stable performance in air. However, most reported inorganic perov-skite-based optoelectronic devices exhibit low photosensitivity which greatly hinders their further applications. Here, we firstly demonstrate a hybrid optical structure which combines the n-type thin film InGaZnO and the all-inorganic perovskite nanowires of CsPbBr3 together. By this way, excellent optical and electrical properties such as a low dark current of 10-10 A (at -5V), a high Iph/Idark of 1.2×104, a response time of 2 ms and photoresponsivity of 3.794 A/W have been ob-tained. It is also found that the photodetector shows good stability in air ambient for two months with little reduction in performance. Moreover, such hybrid photodetectors exhibit enhanced photocurrent and Iph/Idark in high-temperature environment. This work paves a new way for high performance photodetectors and points out the possible application of the inorganic cesium lead halide perovskites in harsh environment.