Constructing high-quality 1D nano/microwire hybrid structure for high-performance photodetectors based on CdSe...

All-inorganic perovskite CsPbBr₃ is considered as a promising photoelectric material due to its high environmental stability and excellent photoelectric properties. Constructing low-dimension hybrid structures by combining CsPbBr₃ with semiconductor materials have recently attracted particular attention because they may bring new functionalities or generate synergistic effects in optoelectronic devices. Herein, the high-quality 1D CdSe nanobelt (NB)/CsPbBr₃ microwire (MW) photodetectors are designed first time, which exhibit excellent performance as integrating I _on/I _off ratio of 5.02 × 10⁴, responsivity of 1.63 × 10³ A/W, external quantum efficiency of 3.8 × 10⁵% and detectivity up to 5.33 × 10¹² Jones. These properties are all improved at least one order of magnitude compared to those of single CsPbBr₃ photodetectors. Moreover, the response range is broadened from the 300-570 nm (the single CsPbBr₃ device) to 300-740 nm (the hybrid photodetector). Then, the first-principles calculations are carried out to reveal the physical mechanism from the atomic scale. The remarkably improved optoelectronic properties are attributed to the high crystalline quality as well as unique band alignment of hybrid structure that facilitate the effective separation and transport of photogenerated carriers. These works indicate that 1D CdSe/CsPbBr₃ hybrid devices have promising applications in building high-performance and broader spectral response photodetectors and other optoelectronic devices.