Dresden 2020 – scientific programme
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 49: Poster Session II
CPP 49.19: Poster
Tuesday, March 17, 2020, 14:00–16:00, P1A
Orders of Recombination in Perovskite Solar Cells — •Christian Wolff1, Sean Bourelle2, Sascha Feldmann2, Felix Deschler2,3, and Dieter Neher1 — 1Institute für Physik und Astronomie, Universität Potsdam, Potsdam, Germany — 2Cavendish Laboratory, Department of Physics, University of Cambridge, Cambridge, UK. — 3Walter Schottky Institut, Technische Universität München, Garching, Germany
Understanding the mechanism and order of recombination in solar cells is of great importance to advance device performance. Pump-probe measurements on neat perovskite layers showed that the rate of recombination is in accordance with dn/dt =−a · n−b · n· (n+p0)−c · n3, which has been explained as the superposition of SRH, free-carrier, and Auger recombination. The situation in the full devices is more difficult, because charges recombine furthermore at surfaces, within other layers or across interfaces. Different measurements have been applied & reported, but thus far rendered an inconsistent picture of the dominant recombination orders and corresponding lifetimes. Combining multiple spectroscopic and electronic experiments, we provide a consistent picture of the dominating processes. We find that recombination under 1 sun illumination is dominated by a first-order process, while at higher intensities radiative recombination is prevailing. Therefore, the recombination in full devices can be well described by a simple rate equation, without the need to employ mixed-order processes. With this, we are able to reconstruct all device characteristics from dynamic variables.