ArticleAngewandte Chemie (International ed. in English)2026
Eutectic Urea Phosphate Suppresses Phase Segregation in Wide-Bandgap Photovoltaic Perovskites.
Article in Angewandte Chemie (International ed. in English), 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Compositional segregation resulting from non-uniform crystallization remains a critical bottleneck limiting the performance of wide-bandgap (WBG) mixed-halide perovskite photovoltaics. Herein, we report a halide-specific coordination strategy by employing a eutectic molecule to stop the phase segregation in WBG perovskites. Owing to the differential affinity of stronger for bromine-based octahedra than iodine-based ones, the urea phosphate molecule acts as a molecular pacemaker synchronizing the crystallization of disparate perovskite phases. This strategy successfully eliminates vertical and lateral phase segregation within the films, leading to a substantial reduction in non-radiative recombination and charge transport losses. Consequently, the champion perovskite photovoltaic devices present a power conversion efficiency (PCE) of 22.27% under AM 1.5G illumination and a promising indoor PCE of 42.64% under 1000 lux. The finding offers a robust paradigm to fabricate high-quality WBG photovoltaic perovskites for indoor energy harvesting in the Internet of Things.
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