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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 49: Poster Session II
CPP 49.11: Poster
Dienstag, 17. März 2020, 14:00–16:00, P1A
Time-Resolved Microwave Conductivity: Temperature Dependent Dielectric Constant and Charge Carrier Dynamics of Methylammonium Lead Iodide — •Patrick Dörflinger, Julian Höcker, Philipp Rieder, Andreas Sperlich, and Vladimir Dyakonov — Experimental Physics VI, Julius Maximilian University of Würzburg, 97074 Würzburg
Perovskite solar cells are one of the most promising new photovoltaic technologies with steadily rising efficiencies. To further improve their potential performance, it is essential to understand their optoelectronic properties as well as to develop novel, not yet established, perovskite materials. With Time-Resolved Microwave Conductivity (TRMC) the mobility and lifetime of photogenerated charge carriers in a perovskite layer, e.g. methylammonium lead iodide (CH3NH3PbI3), can be determined in a non-contact way. Besides the well known data handling in TRMC, one crucial parameter exhibits a strong dependency with temperature. The dielectric constant is not yet experimentally reported in literature for any perovskite material at 9 GHz, the frequency at which TRMC is measured. Considering the behaviour of the dielectric constant of the perovskites and its variation with temperature, one can estimate the temperature dependent mobility with better accuracy. We perform temperature dependent measurements for MAPbI3 from different preparation routes and discuss the power-law behaviour of the mobility in the context of temperature dependence of dielectric constant and the phase transitions of these materials.