Berlin 2018 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 72: Hybrid and Perovskite Photovoltaics I

CPP 72.6: Talk

Thursday, March 15, 2018, 16:45–17:00, C 264

Defect spectroscopy in triple-cation hybrid perovskites — •David Diering¹, Charles Hages¹, Sergiu Levcenco¹, Christian Wolff², Dieter Neher², and Thomas Unold¹ — ¹Helmholtz-Zentrum Berlin, Germany — ²Universität Potsdam

High power-conversion efficiencies have been observed for hybrid perovskite solar cells based on multi-cation materials, containing methylammonium (MA), formamidinium (FA), cesium (Cs). Thus, the question arises how the presence of these cations alters the absorbers optoelectronic properties and defect physics. Capacitance spectroscopy such as thermal admittance is an established method to search for defects, which may contribute to non-radiative recombination.

In this study, the impact of cesium incorporation in
(FAPbI₃)₈₃(MAPbBr₃)₁₇ with cesium contents ranging from 0% to 15% was investigated for a series of solar cells. We performed detailed temperature-dependent admittance measurements, temperature-dependent current-voltage and EQE measurements. The results are correlated with numerical device modelling as well as the opto-electronic properties of the respective pure absorbers, i.e. charge carrier lifetimes.