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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 45: Perovskite and photovoltaics I (joint session HL/CPP)
CPP 45.6: Vortrag
Dienstag, 17. März 2020, 11:15–11:30, POT 251
Understanding the Role of Antisolvent Quenching in Film Formation, Device Performance, and Reproducibility of Triple Cation Perovskite Solar Cells — •Alexander Taylor1,2, Qing Sun1,2, Katelyn Goetz1,2, Maximillian Litterst1,2, Fabian Paulus1,2, and Yana Vaynzof1,2 — 1Integrated Center for Applied Physics and Photonics, TU Dresden — 2cfaed, TU Dresden
Organic-inorganic perovskite materials are promising candidates for high-efficiency solar cells, quickly approaching the performance of current state-of-the-art materials. However, irreproducibility between devices made by different research labs, even world leading labs, continue to plague the field. The causes of this issue seem to be related to small, hard to control details, such as stoichiometry variations of fractions of a percent. Herein, we seek to further the understanding of the irreproducibility in cutting edge "triple cation" perovskite solar cells by examining the minute technical differences exhibited by different researchers. We reveal that subtle differences during the crucial antisolvent step dramatically affect the resulting film microstructure, and therefore the final PV performance. By simulating this device-to-device variation, we can reliably produce devices with widely disparate power conversion efficiencies * as low as 15% and as high as 21%. Crucially, these devices would currently be reported in the literature with the exact same recipe. These results challenge some of the prevailing beliefs currently held by the research community, regarding not only what the highest performing antisolvents are, but also the general role of the antisolvent in fabricating high performance perovskite solar cells.