Publication date: 11th March 2026
Wide-bandgap (WBG) perovskite absorbers are essential for high-efficiency perovskite-silicon tandem solar cells, yet their performance and operational stability remain strongly limited by compositional and structural instabilities, particularly in bromide-rich systems. Two-step solution processing has emerged as a promising approach to improve compositional control and film formation compared to conventional one-step methods.
In this work, we investigate the role of precursor chemistry in two-step processed WBG perovskites, with a particular focus on the choice and distribution of Cs- and Br-containing precursors across the two deposition steps. Different precursor combinations are explored to assess their impact on film formation, optoelectronic properties, device performance, and stability.
To gain insight into the underlying mechanisms, the crystallisation pathways are probed using in situ grazing-incidence wide-angle X-ray scattering (GIWAXS) measurements performed at a synchrotron during film formation. By correlating precursor chemistry with crystallisation dynamics and device characteristics, this study aims to advance the understanding of two-step processing strategies for WBG perovskite absorbers.
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