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Berlin 2015 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 31: P3: Hybrid Photovoltaics and Preovskites

CPP 31.4: Poster

Tuesday, March 17, 2015, 14:00–16:00, Poster B

Investigating the morphology of CH3NH3PbI3−xClx highly efficient planar perovskite solar cells — •Johannes Schlipf1, Lukas Oesinghaus1, Pablo Docampo2, Thomas Bein2, and Peter Müller-Buschbaum11TU München, Physik-Department, LS Funktionelle Materialien, James-Franck-Str. 1, 85748 Graching — 2LMU München, Department Chemie, Butenandtstr. 11, 81377 München

Organo-metal halide perovskites mark a paradigm shift in photovoltaic research. Recently reported power conversion efficiencies exceeding 15% are possible due to their highly crystalline nature even when processed from solution. However, film morphology is directly connected to the preparation routine and material properties like charge diffusion lengths that are intrinsically linked to photovoltaic performance. We prepare highly efficient planar methylammonium (MA) lead iodide perovskite solar cells via a two-step solution-conversion process, i.e. dipping of a previously deposited PbI2 thin film into a MA-containing solution [1]. We complement electronic and optical characterization using UV-Vis spectroscopy, EQE and IV measurements with grazing incidence small and wide angle X-ray scattering (GISAXS and GIWAXS). Thereby it is possible to understand the role of film morphology and influence of film properties on solar cell performance. [1] P. Docampo, et al., Adv. Energy Mater, 4, 1400355, 2014

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