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April 1, 2026Journal of Salt Lake ResearchOpen Access

Effect of Cesium Solid Solution on the Stability of Formamidinium Lead Iodide Perovskites

Danyang DU Pengjiu Wang Chen HUO Fafeng XU Ziyu Zhuang Dandan GAO Haitao FENG

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Key Points

To investigate the intrinsic effects of cesium solid solution on the stability and optoelectronic properties of formamidinium lead iodide (FAPbI3) perovskites.
Synthesize (FA1-xCsx)PbI3 single crystal systems with Cs+ doping levels x=0, 0.05, 0.1, and 0.15.
Characterize using X-ray diffraction (XRD), photoluminescence (PL), time-resolved photoluminescence (TRPL), and density functional theory (DFT) calculations.
Map the solubility equilibrium phase diagram to determine optimal Cs+ concentration for crystal growth.
Cs+ doping of 10% significantly enhances the intrinsic stability of FAPbI3; pure FAPbI3 undergoes phase degradation after 1,000 hours, while doped samples maintain alpha phase stability after 2,000 hours.
The bandgap increases with higher Cs+ concentration, with a blue shift in the PL peak from 836 nm to 797 nm.
For synthesis temperatures below 190℃ and Cs+ concentrations of 8%-15%, rapid heating is necessary to suppress impurity phases and achieve large alpha phase crystal growth.

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Implication

Reveals Cs doping improves stability in perovskites, suggesting better performance for solar cells.

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Cite This Study

DU et al. (2026) studied this question.

synapsesocial.com/papers/6a17ddab3fad632b0f9da676 https://doi.org/10.3724/j.yhyj.2025075

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