Presentation Details
| Non-Idealities in Pulsed-light Characterization of Perovskite Solar Cell Films Rodolfo De La Cruz Zanetti1, Buh Kum Tatchen2, Ahmad R.Kirmani2, Richard R.King1. 1Arizona State University, Tempe, AZ, USA.2Rochester Institute of Technology, Rochester, NY, USA.3Rochester Institute of Technology, Rochester, NY, USA.4Arizona State University, Tempe, AZ, USA |
Abstract
We demonstrate experimentally that carrier lifetimes extracted from time-resolved photoluminescence (TRPL) measurements, as well as photoluminescence (PL) intensities measured on triple-cation perovskite films show a strikingly different dependence on pulse period, pulse energy, and average light-excitation power and duration than for more conventional III-V semiconductors such as GaAs. Varying these measurement conditions can give widely ranging values of lifetime and photoluminescence quantum yield (PLQY) on the same perovskite sample, showing the need to understand these non-ideal effects and to accurately measure and report these measurement conditions whenever pulsed-light characterization of perovskites is done. Data from several studies on the dependence of TRPL lifetime and PL intensity on pulse energy and pulse period are shown, comparing measurements on (Cs,MA,FA)Pb(I,Br)3 perovskites and GaInP/GaAs/GaInP double heterostructures, to demonstrate the various non-ideal behaviors. With this understanding, we go on to examine light-induced changes to the perovskite films that can result during photo-characterization itself. The rate and impact of these light-induced changes during measurement is studied, first, to find measurement conditions that result in minimal light-induced change, and second, to use varying pulse energy and pulse repetition rate as tools to explore the nature of light-induced changes in perovskites. This work describes a time-correlated testing methodology to characterize and minimize these light-induced changes. Furthermore, we show that photo-brightening and carrier lifetime increase together, demonstrated by simultaneous measurements of PL intensity and TRPL decay curves over the same time span, on the same sample. Our observations show that long-term, light-induced chemical changes in the perovskite film depend on both light pulse energy and pulse period (repetition rate). We hypothesize that ultimately these effects may be used to characterize ion formation rate, ion concentration, and ion mobility in perovskite films, in addition to present characterization of electron-hole recombination kinetics.
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