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 modulated by formamidinium thiocyanate in the 2D PEA(2)FA(3)Pb(4)I(13) 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.
Cite this item
Hong, L., Wang, Z., Milic, J. V., Avalos, C. E., Zhang, W., Ren, D., Wang, C., Carlsen, B., Liu, Y., Zakeeruddin, S. M., Hagfeldt, A., Wang, T., Han, H., & Graetzel, M. (2022). Thiocyanate-Mediated Dimensionality Transformation of Low- Dimensional Perovskites for Photovoltaics. Chemistry of Materials, 34(14), 6331–6338. https://doi.org/10.1021/acs.chemmater.2c00760
Click Copy to copy the citation, or select the text manually.
WOS:000828118900001
2022-07-08
34
14
6331
6338
REVIEWED
EPFL