Effects of recombination order on open-circuit voltage decay measurements of organic and perovskite solar cells
Vollbrecht J. Brus V.V.
2 August 2021MDPI AG
Energies
2021#14Issue 16
Non-geminate recombination, as one of the most relevant loss mechanisms in organic and perovskite solar cells, deserves special attention in research efforts to further increase device perfor-mance. It can be subdivided into first, second, and third order processes, which can be elucidated by the effects that they have on the time-dependent open-circuit voltage decay. In this study, analytical expressions for the open-circuit voltage decay exhibiting one of the aforementioned recombination mechanisms were derived. It was possible to support the analytical models with experimental examples of three different solar cells, each of them dominated either by first (PBDBT:CETIC-4F), second (PM6:Y6), or third (irradiated CH3NH3PbI3 ) order recombination. Furthermore, a simple approach to estimate the dominant recombination process was also introduced and tested on these examples. Moreover, limitations of the analytical models and the measurement technique itself were discussed.
Non-geminate recombination , Open-circuit voltage decay , Organic solar cells , Perovskite solar cells , Recombination order
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Soft Matter Physics Group, Institute of Physics and Astronomy, University of Potsdam, Potsdam-Golm, 14476, Germany
Department of Physics, School of Sciences and Humanities, Nazarbayev University, Nur-Sultan, 010000, Kazakhstan
Soft Matter Physics Group
Department of Physics
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