Proceedings of Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics (IPEROP27)
Publication date: 22nd October 2026
Pseudohalide additives have been widely used to regulate crystallization and improve the structural stability of lead halide perovskites. Their effects are generally attributed to the pseudohalide anion, whereas the accompanying counterion is often considered to play a secondary role. However, this description overlooks the possible contribution of counterions to precursor interactions, lattice regulation, and film formation.
Here, we introduce a coupled divalent-cation and pseudohalide regulation strategy for lead halide perovskites. Comparative studies are performed to distinguish the effects of the individual ionic components from those arising from their coupled introduction. The evolution of the perovskite films is examined from precursor crystallization to the final structural and mechanical properties using complementary structural, spectroscopic, morphological, and time-resolved characterization.
The results reveal that the stabilization effect is not solely determined by the pseudohalide anion. The divalent cation contributes to the regulation of the perovskite framework, while its coupling with the pseudohalide modifies the crystallization pathway and local coordination environment. This cooperative regulation promotes controlled film formation, improves crystallographic organization, and reduces structural and mechanical heterogeneity. The resulting films exhibit improved mechanical robustness and reduced degradation under prolonged operational stress.
These findings demonstrate that pseudohalide additives should be considered as complete chemical entities rather than simple anion sources. More broadly, the coupling between counterion selection and pseudohalide chemistry provides a general strategy for regulating perovskite crystallization and enhancing the operational stability of perovskite optoelectronic devices.
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