Giovanni Armaroli, Lorenzo Maserati, Andrea Ciavatti, Pierpaolo Vecchi, Alberto Piccioni, Martina Foschi, Valentina Van der Meer, Chiara Cortese, Matias Feldman, Vito Foderà, Thibault Lemercier, Julien Zaccaro, Javier Mayén Guillén, Eric Gros-Daillon, Beatrice Fraboni, Daniela Cavalcoli
Metal halide perovskites (MHPs) are disruptive materials for a vast class of optoelectronic devices. The presence of electronic trap states has been a tough challenge in terms of characterization and thus mitigation. Many attempts based on electronic spectroscopies have been tested, but due to the mixed electronic-ionic nature of MHP conductivity, many experimental results retain a large ambiguity in resolving electronic and ionic charge contributions. Here we adapt a method, previously used in highly resistive inorganic semiconductors, called photoinduced current transient spectroscopy (PICTS) on lead bromide 2D-like ((PEA)2 PbBr4 ) and standard "3D" (MAPbBr3 ) MHP single crystals...
October 13, 2023: ACS Energy Letters