Dresden 2026 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 44: Hybrid, Organic and Perovskite Optoelectronics and Photovoltaics V

CPP 44.1: Hauptvortrag

Donnerstag, 12. März 2026, 09:30–10:00, ZEU/LICH

Shedding light on wide bandgap perovskites — •Michael Saliba — Institute for Photovoltaics (ipv), University of Stuttgart, Germany

Low bandgap perovskite solar cells are approaching the Shockley-Queisser limit for single-junction solar cells. Less progress, however, was made for wider bandgap perovskites, which are of interest, e.g., for multijunction photovoltaics. These wide bandgap perovskites are often comprised of fully inorganic components, which are hard to dissolve in conventional solvent systems and require more sophisticated synthesis as well as crystallisation techniques. In this talk, I will discuss strategies to address these challenges by providing a library of hitherto unexplored wider bandgap perovskites using combinatorics.

Unfortunately, the newly formulated liquid precursors often exhibit complex crystallization behaviour struggling to expel the typically used DMSO solvent. To delay the crystallization time, two strategies are proposed to remove the strongly complexating DMSO molecules through a) modified processing of the liquid thin-film and b) a coordination solvent with a high donicity and a low vapor-pressure leading to a marked improvement in the overall film quality. Lastly, interface manipulation, especially on top of the formed perovskite, is becoming a central topic to advance further. Light annealing is introduced to modify the perovskite surface resulting in a reduced surface recombination.

Keywords: Perovskite materials; crystallization