Low dose indirect conversion X-ray sensors based on Cs3Cu2I5 and CsPbBr3 coated BPW-34 photodiode

Metal halide perovskites (MHPs) have demonstrated tremendous applicability in optoelectronic research owing to their fascinating properties and extensive range of crystal structures. Among the MHPs, cesium copper iodide (Cs3Cu2I5) and cesium lead bromide (CsPbBr3) have been utilized in numerous applications like photovoltaics, photodetectors, and scintillation detectors. In this report, we present a cost-effective approach to developing an indirect conversion X-ray sensor based on Cs3Cu2I5 and CsPbBr3, utilizing a commercial photodiode (BPW 34). The MHPs were synthesized by solid-state exchange reaction, dissolved in dimethyl formamide (DMF), and recrystallized within a polymer matrix. The MHP polymer matrix was then coated onto the top surface of the photodiodes as thick films. The photocurrent characteristics of Cs3Cu2I5 and CsPbBr3 indirect X-ray sensors, upon exposure to X-rays at 70 kVp energy under various X-ray exposures and zero bias conditions, were recorded. Both MHPs exhibited a significant response to the incident X-rays. These outcomes highlight the potential of Cs3Cu2I5 and CsPbBr3 scintillators for fabricating X-ray imagers based on commercial photodiode arrays.