Berlin 2018 – scientific programme
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 46: Poster Session IV
CPP 46.4: Poster
Wednesday, March 14, 2018, 11:00–13:00, Poster A
Combinatorial Investigation of Co-Evaporated CsPbI3 Thin Films — •Pascal Becker, Justus Just, and Thomas Unold — Helmholtz-Zentrum Berlin, Germany
Lead halide Perovskite materials have recently emerged as very promising new material for thin film solar cell absorbers yielding power conversion efficiencies of above 22 %. Highest power conversion efficiencies are found for Pb-based inorganic-organic halides, which tend to chemically decompose at elevated temperatures. Inorganic lead halide perovskites such as CsPbI3 are significantly more stable and well suited candidates for high efficient tandem solar cells due to their high bandgap of 1.8 eV. However, much less is known about the crystal structure and optoelectronic properties of these compounds.
We synthesized combinatorial samples of CsPbI3 thin films with a spatial gradient in composition by co-evaporation of CsI and PbI2. Applying X-ray diffraction mapping, X-ray fluorescence mapping and UV-vis mapping on these samples we are able to investigate the phase diagram of this compound as well as the optoelectronic properties of the different phases. Depending on the composition and growth temperature we find a transition from the yellow phase to the brown phase in CsPbI3 as well as segregation of excess CsI and PbI2.