Drastic influence of substituent position on orientation of 2D layers enables efficient and stable 3D/2D perovskite solar cells
The lack of long-term stability and reproducibility of perovskite solar cells (PSCs) is the main roadblock preventing their successful commercialization. 3D/2D PSCs are one of the most prominent ways to address these issues. Various salts that are mostly based on phenyl ethyl ammonium iodide (PEAI) have been utilized to grow a 2D perovskite layer on 3D perovskites. Herein, we report the effect of substituting the methoxy (-OMe) group at the ortho (o), meta (m), and para (p) positions on PEAI salts. Photoluminescence and time-resolved photoluminescence show that o-OMe-PEAI-treated surfaces achieve reduced defect densities and nonradiative recombination rates compared with the other analogs. Devices with PCEs over 23% are achieved for o-OMe-PEAI-based 3D/2D PSCs, and the enhanced performance is attributed to the favorable formation energy and desired vertical orientation according to the density functional theory (DFT) analyses. Finally, the unique orientation of the o-OMe-PEAI-based 2D perovskite results in significantly enhanced long-term, moisture, and thermal stability.
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Gunes, U., Yaylali, F. V., Karabag, Z. G., Gao, X.-X., Syzgantseva, O. A., Karabag, A., Yildirim, G. B., Tsoi, K., Shibayama, N., Kanda, H., Rafieh, A. I., Zhong, L., Zuttel, A., Dyson, P. J., Yerci, S., Nazeeruddin, M. K., & Gunbas, G. (2023). Drastic influence of substituent position on orientation of 2D layers enables efficient and stable 3D/2D perovskite solar cells. Cell Reports Physical Science, 4(5), Article 101380. https://doi.org/10.1016/j.xcrp.2023.101380
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WOS:001043051000001
2023-05-17
4
5
101380
REVIEWED
EPFL