Publication date: 22nd July 2026
Metal-halide perovskites have emerged as leading candidates for next-generation photovoltaic technologies owing to their excellent optoelectronic properties, low-cost processing, and compositional tunability. [1] Among them, tin-based perovskites are attracting increasing attention as environmentally friendly alternatives to lead-containing materials. However, their practical implementation remains hindered by critical instability mechanisms, including the oxidation of Sn²⁺ under ambient conditions and photoinduced compositional changes in mixed-halide systems. Addressing these degradation pathways is essential for the development of stable perovskite devices for real-world applications.
Here, we investigate the impact of compositional engineering on the structural, optical, and operational stability of mixed-halide tin perovskites. The stability of the mixed-halide compositions was evaluated under continuous illumination through in situ photoluminescence measurements. The investigated materials exhibit remarkable resistance to light-induced halide segregation, maintaining stable emission characteristics under illumination intensities comparable to standard operating conditions and showing only minor spectral variations at significantly higher excitation densities. These results indicate a strong suppression of photoinduced phase separation, a major limitation in many mixed-halide perovskite systems.
Ongoing studies further explore how interfacial engineering, particularly through tailored charge-transport layers, can influence halide redistribution dynamics and provide additional routes toward stabilizing mixed-halide perovskites. Together, these findings highlight synergistic compositional and interfacial approaches for enabling durable lead-free perovskite photovoltaics.
This work was supported by the Ministry of Science and Innovation of Spain MCIN/AEI/https://doi. org/10.13039/501100011033/ and by FEDER “Una manera de hacer Europa” under Project ConFlex (PID2023-151880OB-C33) and by Comunidad Valenciana through the program GRISOLIA (CIGRIS/2022/122).
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