Proceedings of International Conference on Perovskite Thin Film Photovoltaics and Perovskite Photonics and Optoelectronics (NIPHO22)
DOI: https://doi.org/10.29363/nanoge.nipho.2022.025
Publication date: 11th November 2021
Metal halide perovskites of the general formular ABX3 where A is a monovalent cation such as caesium, methylammonium or formamidinium, B stands for divalent lead, tin or germanium and X is a halide anion, have shown great potential as light harvesters for thin film photovoltaics. Amongst a large number of compositions investigated, the cubic α-phase of formamidinium lead triiodide (FAPbI3) has emerged as the most promising semiconductor for highly-efficient and stable perovskite solar cells (PSCs). Maximizing the performance of α-FAPbI3 has therefore become of vital importance for perovskite research. Using formate ions to mitigate lattice defects and to augment film crystallinity, we attain a power conversion efficiency of 25.6 % (certified 25.2%). We further enhanced light capture and largely suppress non-radiative recombination at the ETL-perovskite interface, enabling PSCs with a PCE of 25.7% (certified 25.4%) and excellent operational stability as well as intense electroluminescence with external quantum efficiencies of 12.5%. Our findings provide a facile access to solution processable films with unprecedented opto-electronic performance.
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