Berlin 2018 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 48: Focus: Fundamental Physics of Perovskites I - organized by Lukas Schmidt-Mende and Vladimir Dyakonov
CPP 48.7: Vortrag
Mittwoch, 14. März 2018, 17:00–17:15, C 130
Transient Photoluminescence Studies of CH3NH3PbI3/PC61BM Heterojunctions — •Benedikt Krogmeier1, Florian Staub1, David Grabowski1, Uwe Rau1, 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
Lead-halide perovskites have shown long bulk lifetimes in thin film photovoltaics, which implies that devices are limited by the interfaces and that studying the selectivity of contacts can lead to further improvement. One method proposed for obtaining interface properties is studying the transient photoluminescence of a lead-halide perovskite and an electron- or hole-transfer material layer. Previous studies analyze the photoluminescence transients using either rate equations or analytical solutions to the diffusion equation and do not take non-linearities caused by charge accumulation at the interface into account. Therefore we use numerical drift-diffusion simulations of the transient photoluminescence of CH3NH3PbI3/PC61BM heterojunctions which enables us to study the impact of laser fluence and interface properties without neglecting the non-linearities. The results show that charge accumulation can have a major impact on the lifetime measured with transient photoluminescence. Comparing simulated photoluminescence with measured data gives us insight into the dominating charge carrier loss mechanisms at different laser fluences and an analysis of the uniqueness of our result enables us to obtain an interfacial recombination velocity of 200 cm/s.