Regensburg 2016 – scientific programme

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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 21.1: Talk

Tuesday, March 8, 2016, 10:45–11:00, H37

Charge Carrier Recombination Dynamics in Perovskite and Polymer Solar Cells probed by Time-Delayed Collection Field (TDCF) Experiments — •Andreas Paulke¹, Samuel D. Stranks², Juliane Kniepert¹, Jona Kupiers¹, Christian M. Wolff¹, Natalie Schön¹, Henry J. Snaith², Thomas J.K. Brenner¹, and Dieter Neher¹ — ¹Institut für Physik und Astronomie, Universität Potsdam, Karl-Liebknecht-Str.24-25, 14476 Potsdam — ²Department of Physics, University of Oxford, Clarendon Laboratory, Parks Road, Oxford OX1 3PU, United Kingdom

Time-Delayed Collection Field (TDCF) experiments are applied to organometal halide perovskite (CH₃NH₃PbI₃) based solar cells to investigate charge carrier recombination in a working solar cell at the nanosecond to microsecond timescale. Planar perovskite solar cells (ITO/PEDOT:PSS/Perovskite/PCBM/C₆₀/BCP/Al) display a second-order recombination process with a slow-down of the apparent recombination coefficient over several tens of nanoseconds. In contrast, recombination in the ITO/TiO₂/mesoporous−TiO₂/Perovskite/Spiro−OMeTAD/Au device is governed by a slow first order process, but again with an apparent time-dependence of the recombination coefficient. We also conclude that organometal halide perovskite solar cells differ significantly from prototypical organic bulk heterojunction devices with regard to the mechanism and time-scale of free carrier recombination.