Solar energy paper index
Preventing Triple Halide Intermediate Formation for Segregation-Resistant Wide Band Gap Perovskites
One-line summary
A solar energy research paper on Preventing Triple Halide Intermediate Formation for Segregation-Resistant Wide Band Gap Perovskites.
Engineering notes
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Chinese explanation / 中文解读
中文解读待补充：本站会优先为光伏效率、钙钛矿太阳能电池、储能技术、太阳能热利用、BIPV、并网技术等高价值论文补充中文说明。
Original abstract
High Resolution Image Download MS PowerPoint Slide Mixed I-Br perovskites are promising top absorbers for tandem solar cells due to their tunable band gap and solution processability, yet photoinduced halide segregation—a critical but poorly understood degradation mechanism—hinders their reliability. Here, we demonstrate how the enhancement of the Br − binding energy in the perovskite inhibits I 2 Br − formation—the key intermediate species driving halide segregation. The incorporation of densely charged cations like Sr 2+ in the perovskite strongly localizes halide anions, inhibiting their electron donation to photogenerated I 2 and preventing triple halide ion formation, which eventually suppresses halide segregation. Additionally, this also reduces undercoordinated Pb at grain surfaces, suppressing nonradiative recombination. These synergistic effects yield high-performance solar cells with champion efficiencies of 20.18% at 1.77 eV and 19.02% at 1.84 eV, alongside enhanced stability. Our work establishes a design principle to mitigate halide segregation in mixed-halide perovskites, overcoming a major challenge in perovskite optoelectronics.
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