Berlin 2015 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 31: P3: Hybrid Photovoltaics and Preovskites

CPP 31.6: Poster

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

Novel approaches for tuning optical and electronic properties of perovskites and their application in hybrid thin film solar cells — •Lukas Oesinghaus, Johannes Schlipf, and Peter Müller-Buschbaum — TU München, Physik-Department, LS Funktionelle Materialien, James-Franck-Str. 1, 85748 Garching

Recently, Docampo et al. reported achieving an efficiency of up to 15.4% for solution processed planar heterojunction perovskite solar cells by using a simple two-step sequential deposition process [1].

We use a similar method, where a PbI2 film is spin cast and subsequently converted to perovskite in a mixed solution of methylammonium iodide (MAI) and methylammonium chloride (MACl), which results in a better film homogeneity as compared to single-step solution deposition and larger diffusion lengths as compared to films prepared with pure MAI solutions. Thus the overall photovoltaic performance is increased. We tune the morphology and the properties of the interfaces adjacent to the charge selective electrodes. This has an effect on the photovoltaic performance, which is characterized by UV-Vis, IV and EQE measurements. With AFM and SEM complementary structure information is achieved.

[1] Docampo et al., Adv. Energy Mater., 2014, 4, 1400355.