Effect of Antisolvent Application Rate on Film Formation and Photovoltaic Performance of Methylammonium‐Free Perovskite Solar Cells

The poor stability of perovskite solar cells that are based on methylammonium (MA)‐containing compositions has triggered immense interest in the development of MA‐free alternatives such as the double‐cation mixed‐halide Cs x FA1–x Pb(I1–x  + Br x )3 composition (CsFA perovskites). Although efficient...

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Bibliographic Details
Published in:Advanced energy and sustainability research 2021-11, Vol.2 (11), p.n/a
Main Authors: An, Qingzhi, Vieler, Leonie, Goetz, Katelyn P., Telschow, Oscar, Hofstetter, Yvonne J., Buschbeck, Robin, Taylor, Alexander D., Vaynzof, Yana
Format: Article
Language:English
Subjects:
antisolvents
Composition
Crystallization
Energy conversion efficiency
Maximum power
methylammonium-free perovskites
Perovskites
Photovoltaic cells
Photovoltaics
processing
Reproducibility
Solar cells
Solvents
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Summary:The poor stability of perovskite solar cells that are based on methylammonium (MA)‐containing compositions has triggered immense interest in the development of MA‐free alternatives such as the double‐cation mixed‐halide Cs x FA1–x Pb(I1–x  + Br x )3 composition (CsFA perovskites). Although efficient solar cells based on this composition have been reported, many aspects related to the film formation of CsFA perovskites remain unclear. Herein, the influence of the antisolvent application rate on the properties and device performance of MA‐free perovskite solar cells are investigated. It is found that when applied slowly, all six of the investigated antisolvents result in high‐quality films and devices reaching a maximum power conversion efficiency of 20.7%. However, fast application leads to incomplete film coverage, and consequently no functional solar cells, for three of these antisolvents. It is demonstrated that this is related to the inefficacy of these antisolvents in triggering the crystallization of the perovskite layer and a simple test is offered that can aid researchers to identify whether other antisolvents will favor fast or slow antisolvent application. The influence of the antisolvent application rate on the properties and device performance of Cs0.1FA0.9PbI2.9Br0.1 perovskite solar cells is investigated. It is found that slower antisolvent application rates are generally beneficial for triggering crystallization, resulting in better film formation and an overall higher photovoltaic performance.
ISSN:2699-9412
2699-9412
DOI:10.1002/aesr.202100061