Regensburg 2019 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 2: Hybrid and Perovskite Photovoltaics I
CPP 2.7: Vortrag
Montag, 1. April 2019, 11:30–11:45, H18
Quantitative Analysis of the Transient Photoluminescence of Lead Halide Perovskite with Contact Layers — •Benedikt Krogmeier1, Lisa Krückemeier1, and Thomas Kirchartz1,2 — 1IEK5-Photovoltaik, Forschungszentrum Jülich, 52425 Jülich, Germany — 2Faculty of Engineering and CENIDE, University of Duisburg-Essen, Carl-Benz-Str. 199, 47057 Duisburg, Germany
Transient photoluminescence (PL) is a powerful measurement technique to study charge carrier dynamics in perovskite layers. A single layer of lead halide perovskite measured with this technique usually shows a high charge carrier lifetime. However, adding additional contact layers may substantially accelerate the PL decay and therefore decrease the measured lifetime. The higher decay occurs due to the extraction of charge carriers into the contact layer or due to charge carrier recombination at the interface. As the measurements are done on uncontacted samples (i.e. in open circuit), charge carriers may accumulate on the contacts after extraction and thereby repel additional charges at longer times and higher laser fluences. The superposition of extraction, accumulation and recombination makes the use of numerical simulations necessary. We use these simulations to describe experimental results on various structures featuring, zero, one or two contact layers. In addition, we study the effect of low conductivity interface layers (such as PTAA or PCBM) and the effect of high conductivity layers such as indium tin oxide or silver on lateral diffusion and thereby the decay kinetics.