Berlin 2018 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 13: Poster Session I

HL 13.41: Poster

Montag, 12. März 2018, 17:30–19:30, Poster B

Morphology control of methylammonium bismuth iodide films for photovoltaics — •Christian Fettkenhauer, Martina Pantaler, Irina Anusca, and Doru C. Lupascu — Institute for Materials Science and Center for Nanointegration Duisburg-Essen (CENIDE), University of Duisburg-Essen, Universitätsstraße 15, 45141 Essen, Germany

Recently, perovskite solar cells have attracted much attention due to the high achievable efficiencies using abundant hybrid organic-inorganic perovskite absorber materials. The benchmark perovskite absorber is methylammonium lead iodide (MAPI). In this material lead causes serious discussion about potential environmental hazards. Bismuth derived materials like MA₃Bi₂I₉ (MBI) might be a less poisenous alternative to MAPI. Although MBI has already been known since the 1960ies its suitability as absorber material has just recently been evaluated. The current power conversion efficiency (PCE) record is 1.64 %. One of the reasons for the lower performance compared to MAPI based solar cells are the anisotropic charge carrier transport properties. Thus, one of the approaches to further increase the PCE is the controlled growth of MBI thin films with a-b planes perpendicular to the substrate. In this work we compare different vapor- and solution processed MBI films with respect to their crystal growth direction, optical absorption, and morphology of the resulting films aiming for further efficiency improvement of MBI based solar cells.