Berlin 2018 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 72: Hybrid and Perovskite Photovoltaics I

CPP 72.1: Hauptvortrag

Donnerstag, 15. März 2018, 15:00–15:30, C 264

Ionic (in)homogeneity in metal-halide perovskites — •Eva Unger — Helmholtz Zentrum Berlin für Materialien und Energie, Albert Einstein Strasse 16, 12489 Berlin — Lunds Universitet, Naturvetarvägen 14, Lund, Schweden

Metal-Halide Perovskites are highly ionic semiconductors, which gives rise to some intriguing material properties. Alloys with increasing complexity have evolved during the past years in the attempt to tune the material band gap and synthesize perovskite semiconductors with increased stability. In mixed-cation and mixed-anion alloys, ionic (in)homogeneity and photo- or bias-induced ion migration can limit the device performance and give rise to strong transient capacitive effects in current-voltage measurements giving rise to hysteresis. This talk will reflect on ionic (in)homogeneity in metal halide perovskites as it evolves from the complex chemistry in solution to the consequence of ionic entropy on crystallization kinetics and how intrinsic ionic homogeneity or externally induced ion redistribution affect device performance.