Berlin 2024 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 13: Poster I

HL 13.33: Poster

Monday, March 18, 2024, 15:00–18:00, Poster E

Investigating the iodoplumbate complex evolution of perovskite solution during spin coating via UV-VIS in-situ spectroscopy — •Maximilian Spies, Simon Biberger, and Anna Köhler — University of Bayreuth, Bayreuth, Germany

We investigated the precursor solution for the fabrication of MAPbI3 perovskite thin films via UV-VIS absorption spectroscopy during the spin coating process (in-situ). The iodoplumbate complexes present in this precursor solution absorbe light in the UV range, providing insights into the precursor chemistry that is crucial for the formation of the final perovskite film. Since these iodoplumbate complexes are very sensitive to their environment and can alter their coordination considerably when changing parameters like the solvent or concentration, we conducted an in-situ study during the critical phase before the nucleation in order to get a deeper insight into the formation dynamics of neat perovskite thin films. We find that an absorption peak, commonly stated to originate from the PbI3^- complex, shifts to lower energies with respect to time during spin coating, indicating a growth of the electronic system. The amount of this red shift depends on the precursor concentration and the composition of the solvent in use.

Keywords: iodoplumbate complexes; film formation; in-situ spectroscopy; UV-VIS