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Regensburg 2016 – scientific programme

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DS: Fachverband Dünne Schichten

DS 11: Hybrid and Perovskite Photovoltaics I
(Joint session of CPP, DS and HL, organized by CPP)

DS 11.7: Talk

Monday, March 7, 2016, 16:45–17:00, H38

Iodine Migration and its Effect on Hysteresis in Perovskite Solar CellsCheng Li1, Steffen Tscheuscher2, Fabian Paulus3, Paul Hopkinson3, Johannes Kiessling1, Anna Köhler2, Yana Vaynzof3, and •Sven Hüttner11Organic and Hybrid Electronics, Makromol. Chemie I, Universität Bayreuth — 2Experimentalphysik II, Universität Bayreuth — 3Centre for Advanced Materials, Universität Heidelberg

Solution-processed organic-inorganic hybrid perovskite solar cells (e.g. CH3NH3PbI3xClx) currently exhibit promising performances. However, the origin of the observed hysteresis in the current-voltage (J-V) curves, i.e. the sweeping-history-dependent electrical current, is still not sufficiently understood. To investigate its origin we employ electroabsorption (EA) spectroscopy to explore the built-in potential in working photovoltaic devices. Furthermore, we study the temperature dependent dynamic processes in perovskite solar cells by characterizing their current-voltage behavior at different temperatures. The electrical current relaxation process during temperature dependent J-V measurements provides the evidence of the migration of ions. In order to investigate the nature of these ions, we further present X-ray photoemission spectroscopy (XPS) experiments which shows the elemental redistribution after applying an electrical bias. The results give a concise picture that mainly iodide ions can be driven by an external electrical field and then accumulate at the respective perovskite/electrode interfaces. The migration and accumulation of iodide ions create a modulation of the respective interfacial barriers which is the origin of the hysteresis.

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