Randomized trial shows improved efficiency and stability in perovskite solar cells, suggesting bromine positioning is key.
-BrPEAAA-based quasi-2D RP perovskite film exhibits improved crystallinity, prolonged carrier lifetime, and more favorable electronic structure. The corresponding device achieves a champion PCE of 20.16%, outperforming its meta-substituted counterpart (18.91%). In addition, the para-substituted system shows improved thermal and moisture stability. This work highlights bromine substitution-position engineering as an effective strategy for regulating spacer-framework interaction and improving the efficiency and stability of quasi-2D RP perovskite solar cells.
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Dong et al. (2026) studied this question.
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