High Sensitive and Broadband Photodetectors Based on Hybrid PbI2 Nanosheet/CdSe Nanobelt

The limited detection of lead iodide (PbI2) to visible light hinders the further development of PbI2 in the field of optoelectronic applications. A photodetector based on PbI2 nanosheet/CdSe nanobelt (PbI2 NS/CdSe NB) is prepared for the first time. This composite structure exhibits broadband spectral photoresponse from ultraviolet (400 nm) to red (730 nm). More importantly, PbI2 NS/CdSe NB can promote the effective separation of electron-hole pairs and improve the photoelectric performance. Compared to single PbI2 NS, the PbI2 NS/CdSe NB photodetector exhibits higher light-dark current ratio (6.778 x 10(3) A), responsivity (347.57 A W-1), and detectivity (3.625 x 10(15) Jones) under 490 nm illumination. A new strategy is provided here to design broadband and high-performance photodetectors.

Automated summary

A photodetector based on PbI2 nanosheet/CdSe nanobelt was prepared for the first time, showing a broadband spectral photoresponse and improved photoelectric performance. This new strategy provides a way to design broadband and high-performance photodetectors.