Dresden 2026 – scientific programme
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 44: Hybrid, Organic and Perovskite Optoelectronics and Photovoltaics V
CPP 44.6: Talk
Thursday, March 12, 2026, 11:00–11:15, ZEU/LICH
Solvated PbI2 Clusters Preceding the Crystalization of Lead Halide Perovsites - UV/VIS In Situ Study — •Maximilian Spies1, Leonard Krapf1, Fabian Eller2, Eva M. Herzig2, and Anna Köhler1 — 1Soft Matter Optoelectronics, University of Bayreuth — 2Dynamics and Structure Formation, University of Bayreuth
The solution-based fabrication of reproducible, high-quality lead iodide perovskite films demands a detailed understanding of the crystallization dynamics. This dynamic is primarily determined by the precursor solution chemistry and processing conditions. We conducted a systematic in-situ study to elucidate the formation mechanism of perovskite films and the role of additives in the pre-crystallization phase. Using UV absorption spectroscopy during spin coating allows us to track the evolution of iodoplumbate complexes and a solvated pre-crystalline phase (PDS) present in the precursor solution. This PDS phase is proportional to the precursor concentration, even during spin coating. Notably, using different precursor solvents changes the PDS phase evolution substantially. However, when introducing additives we see no difference in this pre-crystalline evolution, suggesting that additives only affect the perovskite film formation at a later stage
Keywords: methylammonium lead iodide; in-situ spectroscopy; iodoplumbate complexes; precursor chemistry; crystallization