SKM 2023 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 25: Perovskite and photovoltaics II (joint session HL/CPP)
HL 25.9: Vortrag
Mittwoch, 29. März 2023, 12:15–12:30, JAN 0027
Determining (almost) all optoelectronic properties of halide perovskites by transient photoluminescence — •Hannes Hempel1, Martin Stolterfoht2, Fangyuan Ye2, and Thomas Unold1 — 1Helmholtz Zentrum Berlin, Germany — 2Institute of Physics and Astronomy, University of Potsdam, Germany
Time-resolved photo luminescence (trPL) is probably the most common technique to quantify lifetimes of photogenerated charge carriers in semiconductors. However, the usual fitting of exponential decays to estimate lifetimes is a rather crude phenomenological approach since it ignores quenching processes that are not connected to carrier recombination and disregards the absolute amplitude of the luminescence. Here, we present an analysis of injection-dependent absolute trPL transients of bare triple-cation lead halide perovskite thin films. The presented analysis reveals a doping concentration of 3x1013cm-3 and a charge carrier mobility of 0.8 cm2/Vs, which are confirmed by Hall measurements. Further, we determine the injection-dependence of external radiative lifetimes, of the external radiative coefficient, and of the effective charge carrier lifetime. Based on the properties, an implied current-voltage curve is constructed that reveals the potential performance of the material in solar cell. Our trPL-based approach agrees well with the results of injection-dependent photoluminescence quantum yield measurements. However, it is superior in attributing losses, e.g. in the radiative ideality factor or the implied open circuit voltage, to the internal optoelectronic properties and thereby indicates the path to overcome these losses.