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Methylammonium lead tribromide (MAPbBr3) perovskite single crystals demonstrate to be excellent direct X-ray and gamma-ray detectors with outstanding sensitivity and low limit of detection. Despite this, thorough studies on the photophysical effects of exposure to high doses of ionizing radiation on this material are still lacking. In this work, we present our findings regarding the effects of controlled X-ray irradiation on the optoelectronic properties of MAPbBr3 single crystals. Irradiation is carried out in air with an imaging X-ray tube, simulating real-life application in a medical facility. By means of surface photovoltage spectroscopy, we find that X-ray exposure quenches free excitons in the material and introduces new bound excitonic species. Despite this drastic effect, the crystals recover after 1 week of storage in dark and low humidity conditions. By means of X-ray photoelectron spectroscopy, we find that the origin …
American Chemical Society
Publication date: 
1 Dec 2021

Giovanni Armaroli, Laura Ferlauto, Ferdinand Lédée, Matilde Lini, Andrea Ciavatti, Alessandro Kovtun, Francesco Borgatti, Gabriele Calabrese, Silvia Milita, Beatrice Fraboni, Daniela Cavalcoli

Biblio References: 
ACS applied materials & interfaces