Understanding Transient Photoluminescence in Halide Perovskite Layer Stacks and Solar Cells

While transient photoluminescence measurements are a very popular tool to monitor the charge-carrier dynamics in field of halide perovskite photovoltaics, interpretation data obtained on multilayer samples is highly challenging due superposition various effects that modulate concentration layer and thereby measured PL. These include bulk interfacial recombination, charge transfer electron or hole transport layers capacitive charging discharging. Here, numerical simulations with Sentauraus TCAD, analytical solutions experimental dynamic range ~7 orders magnitude variety different sample geometries from films glass full devices combined present an improved understanding this method. A presentation decay time TPL follows taking derivative at every proposed. Plotting as function time-dependent quasi-Fermi level splitting enables distinguishing between contributions radiative non-radiative recombination well extraction decay.