Berlin 2015 – scientific programme
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O: Fachverband Oberflächenphysik
O 8: Organic-Inorganic Perovskite Semiconductors (HL with CPP)
O 8.3: Talk
Monday, March 16, 2015, 10:00–10:15, ER 164
Electroabsorption spectroscopy investigation and hysteresis study of perovskite solar cells — •Cheng Li1, Steffen Tscheuschner2, Tanaji Gujar1, Johannes Kießling1, Anna Köhler2, Mukundan Thelakkat1, and Sven Hüttner1 — 1Macromolecular Chemistry I, University of Bayreuth, 95440 Bayreuth, Germany — 2Experimental Physics II, University of Bayreuth, 95440 Bayreuth, Germany
Solution-processed organic-inorganic perovskite solar cells (e.g. CH3NH3PbI3−xClx and CH3NH3PbI3 ) currently show the highest and most promising performances. However, the hysteresis in the J-V curve, i.e. the history dependence of the applied voltage, is still not sufficiently understood. This hysteresis is related to the way how perovskite solar cells are processed. This process exhibits significant influence on the electronic properties of these photovoltaic devices. In this respect, we study the temperature dependent dynamic processes in these pervoskite solar cells by characterizing their current-voltage behaviour. Through this method, we can elucidate the migration of ions and the origin of the hysteresis behaviour. Furthermore, we also use electroabsorption (EA) spectroscopy, a unique non-invasive characterization approach, to investigate the built-in potential in the working device. In this way, we can understand the interaction at the interface between the perovskite active layer and electrodes, providing guideline to optimize the device architecture.