Guanidinium substitution-dependent phase transitions, ionic conductivity, and dielectric properties of MAPbI₃

Abstract

Despite the proven enhancement of MAPbI₃ optoelectronic properties and stability by guanidinium substitution, divergences persist regarding fundamental knowledge on this system. This work shows that GA_<i>x</i>MA_1-<i>x</i>PbI₃ solid solutions have guanidinium content-dependent phase transitions, dielectric permittivities, ionic conductivities, activation energies, and relaxation times.