Regensburg 2016 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 29: Hybrid and Perovskite Photovoltaics II (Joint session of CPP, DS and HL, organized by CPP)

HL 29.2: Vortrag

Dienstag, 8. März 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 Dyakonov^1,2 — 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.