Abstract
The precise quantification of the impact of photoluminescence reabsorption (PLr) in metal-halide perovskite solar cells (PSCs) remains challenging. Herein, the PLr effect is examined by combined time-resolved photoluminescence (TRPL) spectroscopy and time-resolved terahertz spectroscopy (TRTS) and a model is proposed that relates both, the PLr and nonradiative recombination rate (k(nr)) to the quasi-Fermi-level splitting (QFLS). PLr is shown to be beneficial for QFLS when the nonradiative recombination rate (k(nr)) is below a critical value of approximate to 7 10(5) s(-1); at high k(nr) PLr is detrimental to QFLS. By incorporating PLr into a two-diode model that allows extraction of the effective k(nr), the series resistance (r(s)), and the shunt resistance (r(sh)) in PSCs, it is found that neglecting PLr overestimates the effective k(nr), although it does not affect the value of r(s) and r(sh). The findings herein provide insight into the impact of the PLr effect on metal-halide PSCs.