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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 21: Hybrid and Perovskite Photovoltaics II (joint session CPP/DF/DS/HL, organized by CPP)
CPP 21.2: Talk
Tuesday, March 8, 2016, 11:00–11:15, H37
Recombination of photogenerated charge carriers in planar methylammonium lead halide perovskite solar cells — •David Kiermasch1, Stefan Väth1, Kristofer Tvingstedt1, Andreas Baumann2, and Vladimir Dyakonov1,2 — 1Experimental Physics VI, Julius Maximilian University of Würzburg, 97074 Würzburg — 2Bavarian Center for Applied Energy Research (ZAE Bayern) Bayern, 97074 Würzburg
In the last years, solar cells based on organo-metal halide perovskites gained a lot of attention. The efficiency of solar cells with a perovskite absorber nowadays reaches more than 20%. With charge carrier mobilities up to tens of cm2V−1s−1 and diffusion lengths exceeding 1 µm transport doesn’t seem to be a limiting issue in this new kind of photovoltaic technology. However, recombination of the photgenerated charge carriers is an important factor defining e.g. the open circuit voltage of the solar cell. We prepared different methylammonium lead halide perovskite solar cells in planar configuration. Adressing the recombination dynamics, lifetime and concentration of photogenerated charge carriers are studied by transient photovoltage, charge extraction experiments as well as by the technique of open circuit voltage decay. We measured charge carrier lifetimes in the sub-µs-range for high illumination intensities (≥ 1 sun), which is lower than in state of the art bulk heterojunction cells like P3HT:PCBM. Furthermore we discuss our results for different device morphologies and light-absorbing materials.