Regensburg 2016 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 31: Hybrid and Perovskite Photovoltaics III (joint session CPP/DF/DS/HL, organized by DS)

CPP 31.3: Talk

Wednesday, March 9, 2016, 10:00–10:15, H11

Morphology and crystal orientation of hybrid perovskite thin films for application in high efficiency solar cells — •Johannes Schlipf¹, Lukas Oesinghaus¹, Nadja Giesbrecht², Yinghong Hu², Sigrid Bernstorff³, Thomas Bein², Pablo Docampo², and Peter Müller-Buschbaum¹ — ¹TU München, Physik-Department, LS Funktionelle Materialien, 85748 Garching, Germany — ²Department of Chemistry and CENS, LMU München, 80539 München, Germany — ³Elettra-Sincrotrone Trieste S.C.p.A., Basovizza, 34149 Trieste, Italy

Organo-metal halide perovskites mark a paradigm shift in photovoltaic research, as they combine high efficiencies challenging conventional inorganic solar cells with easy processing and cheap abundant precursor materials. Recent reports of power conversion efficiencies around 20% are possible due to remarkable material properties and their highly crystalline nature even when processed from solution. However, photovoltaic performance is directly linked to film morphology which in turn depends on the fabrication method. We investigate hybrid perovskite thin films of high efficiency solar cells prepared by various synthesis protocols with X-ray diffraction, GIWAXS and GISAXS. Thereby, we evidence different crystallization mechanisms that lead to certain morphologies and crystal orientations reflecting the chosen synthesis method [1]. We link these findings to the photovoltaic performance and aim at a rational development of new synthesis methods for high efficiency perovskite solar cells.

[1] Schlipf et al: J. Phys. Chem. Lett, 6, 1265-1269, 2015.