Dresden 2017 – wissenschaftliches Programm
CPP 38.8: Vortrag
Mittwoch, 22. März 2017, 12:30–12:45, ZEU 250
Water-processed hybrid solar cells: deposition of the active layer with vertical composition gradient — •Volker Körstgens1, Florian Buschek1, Martin Wörle2, Hristo Iglev2, Wiebke Ohm3, Stephan V. Roth3, Reinhard Kienberger2, and Peter Müller-Buschbaum1 — 1TU München, Physik-Department, LS Funktionelle Materialien, James-Franck-Str. 1, 85748 Garching — 2TU München, Physik-Department, LS Laser- und Röntgenphysik, James-Franck-Str. 1, 85748 Garching — 3DESY, Notkestr. 85, 22607 Hamburg
Particular environmentally friendly processing of hybrid solar cells with the solvent water is feasible with an active layer consisting of laser-ablated titania and a water-soluble polythiophene . One way to optimize conversion efficiencies of these devices is the introduction of a vertical compositional gradient of the two components of the active layer. Dip-coating and spray-coating have been utilized as techniques which are suitable for the cost-effective preparation of hybrid photovoltaics. We followed the development of the morphology during spray deposition in situ with high spatial and temporal resolution. The mesoscale was probed with GISAXS and the crystallinity of the polymer and the inorganic component was probed with GIWAXS. The changes of the morphology and the influence on photovoltaic performance with the introduction of a compositional gradient are discussed.  Körstgens et al., Nanoscale 7, 2900 (2015).