Dresden 2017 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 20: Fundamentals of Perovskite Photovoltaics II (joint session CPP/DS/HL)

HL 20.7: Talk

Monday, March 20, 2017, 17:30–17:45, ZEU 222

Removing leakage recombination current in planar perovskite solar cells — •Kristofer Tvingstedt¹, Lidon Gil-Escrig², Christina Momblona², Philipp Rieder¹, David Kiermasch¹, Andreas Baumann³, Henk J. Bolink², and Vladimir Dyakonov^1,3 — ¹Experimental Physics VI, Julius Maximillian University of Würzburg, 97074 Würzburg — ²Instituto de Ciencia Molecular, Universidad de Valencia, C/Catedrático J. Beltrán 2, 46980 Paterna, Spain — ³Bavarian Center for Applied Energy Research 97074 Würzburg

All solar cells, including perovskites, suffer from recombination mechanisms of various types out of which leakage current usually dominates at lower voltages. Herein, we demonstrate a three order reduction of this recombination loss mechanism in planar perovskite solar cells by replacing the commonly used hole selective electrode PEDOT:PSS with a polymer arylamine hole transporting semiconductor. This renders these solar cells more useful under lower light intensity, such as end of the day and indoor conditions which we demonstrate via the extreme case of moon lighting conditions, where the cells still generates open circuit voltages of 530 mV. By this substantial leakage reduction we can be able to confirm charges to also remain in the photovoltaic device for up to 2 hours after the light has been switched off. We discuss the mechanisms behind this feature and explain why the arylamine is a superior hole selective electrode.