Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV23)
Publication date: 30th March 2023
FAPbI3 perovskite solar cells (PSCs) are promising due to their bandgap being closer to the Shockley-Queisser (S-Q) limit. Recent progress has led to FAPbI3 PSCs achieving over 25% PCE. However, phase impurity consisting of both photoactive (α-FAPbI3) and partially nonphotoactive (δ-FAPbI3) structures remains a limiting factor for device performance. In this study, we utilized MACl additive to form phase pure FAPbI3 PSCs. Interestingly, the open circuit voltage (Voc) of phase pure FAPbI3 devices was similar to mixed-phase FAPbI3 devices, while the main loss of PCE is due to the unsatisfied short circuit current (Jsc) and fill factor (FF). Through careful analysis of photoluminescence (PL) in the full stack device, we found that surface recombination of the electron transport layer limits the Voc, while insufficient PL quenching at short circuit conditions partially originates from unquenched charge carriers in the perovskite active layer. These findings can guide future research in developing strategies to further improve the efficiency of FAPbI3 PSCs.
H.-Y.L. thanks the Ministry of Education (110RA077C), MOST (110-2222-E-005-005 -MY3), and National Chung Hsing University (111ST001E) for their financial support.
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