Publication date: 22nd July 2026
Over the past six years we have been studying the stability of mixed-halide perovskites. We used a series of advanced characterisation tools like intensity modulated photocurrent spectroscopy, hyperspectral photoluminescence, nano X-ray fluorescence, nano X-ray diffraction, X-ray photoemission electron microscopy and in-situ pair distribution function analysis.
By combining these complementary approaches, we have been able to follow degradation processes across multiple length scales and identify a major degradation pathway in mixed-halide perovskites. We outline three reasons why this degradation is particular harmful. In the end we will discuss how these insights reshape our understanding of halide segregation and how we can move towards stable mixed-halide perovskites.
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