Lead-Free Perovskite Nanoflake/Monoradicular CdSe Nanobelt Hybrid Nanostructures for Ultrasensitive Broadband Photodetectors

Lead halide perovskites have drawn extensive attention on account of their fundamental role in the field of photoelectric detection. Nevertheless, the existence of toxic lead ions and the instability of lead-based perovskites greatly hamper their applications in mass production and commercialization. Herein, a hybrid photodetector based on the lead-free inorganic perovskite nanoflake (Cs3Sb2Br9 NF)/monoradicular CdSe nanobelt (NB) has been successfully prepared. The hybrid nanostructures promote the effective separation of electron–hole pairs, thus dramatically improving the photoelectric performance. Meanwhile, the Cs3Sb2Br9 NF/CdSe NB photodetector possesses a wideband spectral response from 300 to 780 nm and shows a higher responsivity (174 A/W), external quantum efficiency (4.8 × 104 %), and photodetectivity (1.1 × 1014 Jones) under 448 nm illumination. Overall, these superior photoelectric properties confirm that the Cs3Sb2Br9 NF/CdSe NB is a kind of hybrid optoelectronic device with practical application in civilian and military fields.