Proceedings of nanoGe Fall Meeting 2021 (NFM21)
DOI: https://doi.org/10.29363/nanoge.nfm.2021.228
Publication date: 23rd September 2021
Lead-free hybrid perovskites have emerged as an attractive green and efficient alternative to be used in solar cells. In this work, we have prepared bismuth-based hybrid perovskites and studied their dehydration-hydration process. The BzImH[BiI]4·H2O structure (IEF-4 RT-phase) consists in one-dimensional iodobismuthates and the benzimidazolium cation (BzlmH)+ containing one hydration water molecule per formula unit [1]. The transformation from IEF-4 RT-phase to the dehydrated HT-phase (BzImH[BiI]4) occurs at around 100 °C, being a fully reversible process. Besides, stable and homogenous IEF-4 films have been successfully obtained by spin-coating method exhibiting an excellent absorption coefficient (1.5·105 cm-1), similar to that reported for lead perovskite materials. Both their good stability under working conditions (temperature and humidity) and excellent optical properties make them suitable for its use in optoelectronic devices. In addition, we have found a reversible dehydration-hydration process in other Bi-based perovskites.
Referencias
[1] A. A. Babaryk, Y. Pérez, M. Martínez, M. E. G. Mosquera, M. H. Zehender, S. A. Svatek, E. Antolín, P. Horcajada. J. Mater. Chem. C 2021, 9, 11358.
We gratefully acknowledge financial support from Ayudas a la Investigación 2019-Iberdrola Foundation, National MICIU project Retos “MOFseidon” PID2019-104228RB-I00 and MADRID-PV2-CM/EMT-4308 project from Comunidad de Madrid.
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