Work

High-Quality Wide-Bandgap 0D Cs 4 PbI 6 Perovskite Single Crystal for High-Performance Ultraviolet Photodetectors and X-ray Detectors

Year: 2025

Type: article

Abstract: All-inorganic perovskites have excellent photoelectric properties, good stability and thus widespread applications, among which the perovskite based visible-blind ultraviolet photodetection and X-ray detection are surge fields. Herein, the enrichment of PbI2 on the crystal surface is observed and verified for the first time. And it can be avoided by volatilizing at a constant temperature of 70 ℃ to obtain a high-quality transparent colorless Cs4PbI6 single crystal with low defect density and high phase purity, which exhibiting excellent detection property due to its wide bandgap of 3.3 eV. The zero-dimensional transparent colorless Cs4PbI6 single-crystal based visible-blind ultraviolet photodetector shows a high responsivity as much as 35.10 A/W, an external quantum efficiency as high as 1.07 × 104%, and a detectivity as large as 2.45 × 1014 Jones, with an extremely fast response speed of ~ 40 μs and excellent long-term stability. In addition, colorless and transparent Cs4PbI6 is also used in direct-type X-ray detectors exhibiting high sensitivity. Under the irradiation of X-ray source energy (160 KeV) close to that of medical CT, the sensitivity of the device can reach 154.84 μC·Gyair–1·cm–2, and the detection limit is lower than the safe value required for medical diagnosis.

Source: ACS Omega

DOI: 10.1021/acsomega.5c07443