Origin of hysteresis in hybrid perovskite solar cells

Anna Köhler^a, Cheng Li^a, Steffen Tscheuschner^a, Tanaji Gujar^a, Johannes Kießling^a, Sven Huettner^a, Mukundan Thelakkat^a

^aUniversity of Bayreuth, Germany, Universitätsstraße, 30, Bayreuth, Germany

International Conference on Hybrid and Organic Photovoltaics
Proceedings of International Conference on Hybrid and Organic Photovoltaics 2015 (HOPV15)

Roma, Italy, 2015 May 11th - 13th

Organizer: Filippo De Angelis

Oral, Sven Huettner, presentation 270
Publication date: 5th February 2015

Solution-processed inorganic-organic hybrid perovskite CH₃NH₃PbI₃solar cells have shown very promising performance. However, the hysteresis in the J-V curve, i.e. history dependence of the voltage applied, is still matter of concern. In this respect, we study the temperature dependent dynamic processes in J-V curves and carry out electroabsorption (EA) spectroscopy. Electroabsorption a unique non-invasive characterization approach, to investigate the built-in potential in a working device and uncovers the permanent and induced dipole within a semiconductor. It therefore gives information on the built-in field in solar cells as well as information on the interface between electrodes and the active material. The results show a strong temperature dependent behavior in the current decay and a shift of the built-in potential (V_BI) during voltage sweeping. We clearly explain the hystereis and the involved kink in the J-V curve which is visible when approaching the open circuit voltage in forward bias. We can attribute the origin of the hysteresis to the migration and accumulation of ions at the perovskite / electrodeinterface, which lead to the modulation of the interfacial injection barriers.
Hysteresis in a CH3NH3PbI3 perovskite based solar cell.

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