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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 72: Hybrid and Perovskite Photovoltaics I

CPP 72.9: Vortrag

Donnerstag, 15. März 2018, 17:30–17:45, C 264

Influence of Different Halides and Organic Cations on the Crystallization Dynamics of Perovskite Thin Films — •Alessandro Greco, Alexander Hinderhofer, Jan Hagenlocher, and Frank Schreiber — Institute of Applied Physics, University of Tübingen, Auf der Morgenstelle 10, 72076 Tübingen, Germany

The performance of hybrid perovskite thin films in photovoltaic and light emitting devices depends not only on their composition, but also their structural and morphological features.[1] Conventionally, the perovskite thin films in these devices are created with the so-called two-step conversion method, which involves the deposition of an isopropanol solution onto a lead halide precursor (PbX₂, X=I,Br,Cl) via drop casting. The solution contains a defined amount of either methylammonium halide (CH₃NH₃X) or formamidinium halide (CH(NH₂)₂X). The morphology and structural properties of perovskites depend strongly on their composition and the crystallization dynamics. We applied in situ grazing incidence wide angle X-ray scattering (GIWAXS) to determine the reaction rate, domain size and preferred orientation in several perovskite thin films over time. We will discuss how choosing different lead halide precursors in combination with different organic halide solutions can impact the quality and time scale of the structural and morphological development of the perovskite thin films.

[1] N. Arora et al. Science, 358, 768 (2017).