Events

Javier Alejandro Mayén Guillén presents

 Perovskite materials for direct ionising radiation detection

Tuesday, 26th September 2023 at 14:00

Minatec – Palladium 2

Link visio: https://webconf.cea.fr/jean-marie.verilhac/F6QF1Z47

The defence will be in English.

Abstract: Hybrid lead halide perovskites have been studied during the last decade for the detection of X-rays. In this work, MAPbBr₃ has been chosen as sensing material for X-ray detection for medical imaging. MAPbBr₃ shows good X-ray absorption, sufficient charge transport properties, and simple solution growth. MAPbBr₃ single crystals growth has been optimised. The optoelectronic evaluation exhibited a good sensitivity, but large dark current. Three approaches to improve the performance of MAPbBr₃ are exposed. Firstly, chlorine was added, leading to the improvement of charge carrier transport. Secondly, the importance of the growth atmosphere and the beneficial doping that atmospheric water can have on the surface are highlighted. Lastly, post-treatments healing point defects are introduced. The thesis emphasises the potential MAPbBr₃ in medical X-ray imaging devices.