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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 13: Poster: Fundamentals of Perovskite Photovoltaics (joint session CPP, DS, HL)

CPP 13.10: Poster

Montag, 20. März 2017, 18:30–21:00, P1A

Impact of additional PbI₂ and the grain size on optical properties in hybrid lead halide perovskites — •Tobias Meier¹, Fabian Panzer^1,2,3, Tanaji Gujar⁴, Mukundan Thelakkat⁴, and Anna Köhler^1,2 — ¹Experimental Physics II — ²Bayreuth Institute of Macromolecular Research (BIMF) — ³Department of Functional Materials — ⁴Applied Functional Polymers, Macromolecular Chemistry, University of Bayreuth, 95440 Bayreuth, Germany

Hybrid lead halide perovskites are a promising candidate for the absorbing layer in solar cells due to their excellent optical properties i.e. a direct band gap, a high absorption coefficient throughout the entire visible spectrum and a low exciton binding energy. It is known that the precise stoichiometry of the additives during film preparation is important for the device performance. For example a small amount of typically 10% extra PbI₂ was found to be beneficial for the performance. However, the mechanism of how incorporations of additional PbI₂ influences the optical and electronic properties and the role of grain boundaries are not completely understood yet. We therefore performed temperature dependent steady-state absorption and photoluminescence spectroscopy to investigate the impact of additional PbI₂ and the grain size on the fundamental optical properties in thin films of CH₃NH₃PbI₃.