Nanowerk June 7, 2021
To capture the full range of the photophysical processes that occur in metal halide perovskites an international team of researchers (Sweden, Russia, Germany) has developed a novel spectroscopic technique for the study of charge carrier dynamics in lead halide perovskites. This methodology is based on the complete mapping of the photoluminescence quantum yield and decay dynamics in the 2D space of both fluence and frequency of the excitation light pulse. They offer a complete representation of the sample’s photo physics, allow examining the validity of theories by applying a single set of theoretical equations and parameters to the entire data set, and it includes additional nonlinear processes to explain the photophysics of metal halide perovskites. By applying the new methodology to perovskite samples with modified interfaces, they were able to quantify their influence on the charge carrier dynamics in the perovskite layer by changing the density and efficacy of traps. According to the researchers their method has important implications for the development of more efficient perovskite solar cells. The methodology can be applied to any semiconducting material…read more. Open Access TECHNICAL ARTICLEÂ
Fitting of the PLQY(f,P) maps and PL decays by all models. Credit: Nature Communications volume 12, Article number: 3329 (2021)Â