Dresden 2017 – wissenschaftliches Programm
CPP 3.2: Vortrag
Montag, 20. März 2017, 10:45–11:00, ZEU 222
Impact of Preparation Conditions on Properties of Perovskite Thin Films — •Alexander Hinderhofer1, M. Ibrahim Dar2, Jan Hagenlocher1, Neha Arora2, Michael Grätzel2, and Frank Schreiber1 — 1Institute of Applied Physics, University of Tübingen, Auf der Morgenstelle 10, 72076 Tübingen, Germany — 2Laboratory of Photonics and Interfaces, EPFL, CH-1015 Lausanne, Switzerland
The performance of light emitting and light harnessing perovskite thin film devices depend strongly on their structural features. The so-called two-step conversion for preparing perovskite thin films, involves the deposition of lead halide precursor onto a substrate and the subsequent transformation of the resulting films into the perovskite phase by spin coating (drop casting) or dipping into an isopropanol solution containing a defined amount of methylammonium halide (CH3NH3X) (X=I,Br). It is well-known that the morphology and structural properties of perovskite depend strongly on the exact preparation conditions.
We applied grazing incidence wide angle x-ray scattering (GIWAXS) to determine the domain size and preferred orientation in several perovskite thin films. We will discuss the impact of different solvents and preparation methods (spin coating, dip coating) on the structure and morphology of the different perovskite films and we comment on the device performance. Finally, we will comment on the time scale of the crystallization process in CH3NH3PbI3 perovskite thin films, which is accessible by in situ real time x-ray scattering.