Proceedings of 13th Conference on Hybrid and Organic Photovoltaics (HOPV21)
Publication date: 11th May 2021
The open circuit voltage decay (OCVD) is a characteristic transient response from operating solar cells observed after the illumination is turned off. By analyzing such transients correctly, it is possible to obtain valuable information about charge carrier dynamics in fully functional devices. For perovskite solar cells, additional charged species like mobile ions are often present, leading to extraordinary features in the OCVD. Here, we use a self programmed transient drift diffusion simulator accounting for mobile ions with sub-nanoseconds time resolution, to show how quantitative information about the ionic species, such as concentration and diffusion coefficient can be obtained directly from OCVD. The simulated transients, showing characteristic ionic displacement, are in excellent agreement with a multitude of experimental data from methylammonium lead iodide (CH3NH3PbI3) devices, without requiring any change in material input parameters. Further, the ionic contributions to the OCVD are clearly visualized by specially resolved carrier profiles. Our new approach opens up new ways to interpret transient electrical measurements on perovskite based devices.
The work was supported by the German Research Foundation (DFG) through project 382633022 (RECOLPER) and the German Federal Ministry for Education and Research (BMBF) through the grant 03SF0514A (HYPER). We also acknowledge financial support from the Spanish Ministry of Science, Innovation and Universities (MINECO) via the Unidad de Excelencia María de Maeztu, CEX2019‐000919‐M, MAT2017‐88821‐R, and PCI2019‐111829‐2. L.G.E. acknowledges the support of a JdC grant from the MINECO. V. D. further acknowledges the Bavarian State Ministry of Education and Culture, Science and Arts for funding of the Collaborative Research Network “Solar Technologies go Hybrid”.
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