Thiocyanate-Mediated Dimensionality Transformation of Low-Dimensional Perovskites for Photovoltaics
Two-dimensional (2D) hybrid perovskite solar cells have induced widespread research interest owing to their higher stability as compared to three-dimensional (3D) analogues. The photovoltaic performance, however, is still limited. Here, we report a perovskite film dominated by 3D components that are...
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Published in | Chemistry of materials Vol. 34; no. 14; pp. 6331 - 6338 |
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Main Authors | , , , , , , , , , , , , , |
Format | Journal Article |
Language | English |
Published |
American Chemical Society
26.07.2022
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Online Access | Get full text |
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Summary: | Two-dimensional (2D) hybrid perovskite solar cells have induced widespread research interest owing to their higher stability as compared to three-dimensional (3D) analogues. The photovoltaic performance, however, is still limited. Here, we report a perovskite film dominated by 3D components that are modulated by formamidinium thiocyanate in the 2D PEA2FA3Pb4I13 perovskite composition. We demonstrate that a dimensionality transformation from a 2D/3D to predominantly 3D perovskite phase in the presence of SCN-based treatment enhances the optical absorption in visible and near-infrared regions. As a result, the power conversion efficiency improved 4.5 times with respect to the control to above 14%. The unencapsulated cell exhibited excellent moisture stability during the shelf lifetime measurement over 70 days under ambient conditions. |
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ISSN: | 0897-4756 1520-5002 1520-5002 |
DOI: | 10.1021/acs.chemmater.2c00760 |