Berlin 2018 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 72: Hybrid and Perovskite Photovoltaics I
CPP 72.2: Vortrag
Donnerstag, 15. März 2018, 15:30–15:45, C 264
Interaction of mobile ions and electronic charge carriers in organic-inorganic perovskites revealed by in-situ photoluminescence and Kelvin probe measurements — •Susanne T. Birkhold1,2, Jake Precht1, Hongbin Liu1, Rajiv Giridharagopal1, Giles E. Eperon1, Xiasong Li1, Lukas Schmidt-Mende2, and David S. Ginger1 — 1Department of Chemistry, University of Washington, Seattle, Washington 98195, United States — 2Department of Physics, University of Konstanz, 78464 Konstanz, Germany
The mixed ionic-electronic conductivity of organic-inorganic perovskites is expected to be responsible for slow response times, current-voltage hysteresis, as well as stoichiometric changes under an electric bias. Here, we present an investigation of the interaction of mobile ions and electronic charges during electric poling of MAPbI3 and FAPbI3. We use in-situ photoluminescence and Kelvin probe microscopy on lateral electrodes to correlate temporal changes in radiative recombination with the spatial distribution of ionic and electronic species. While ion migration is observed using both charge injecting and insulating contacts, our results show that non-radiative recombination centers only form if both ion migration and charge injection are present in MAPbI3. Combining these results with ab initio simulations reveals a complex interaction between ion migration and charge injection that determines defect energetics. Furthermore, temperature dependent SKPM measurements are applied to determine activation energies of ion migration in MAPbI3 and FAPbI3.