Regensburg 2019 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 17: Poster Session I

CPP 17.18: Poster

Monday, April 1, 2019, 17:30–19:30, Poster B1

Nano-confinement on chain alignment and crystallization of conjugated polymers P3HT and PffBT4T-2OD by printed mesoporous TiO2 photoanodes — •Nian Li, Lin Song, Nitin Saxena, Wei Cao, Xinyu Jiang, and Peter Müller-Buschbaum — TU München, Physik-Department, LS Funktionelle Materialien, James-Franck-Str. 1, 85748 Garching

Control of n-type inorganic morphology, chain orientation and crystallization of the donor polymers is of significance in hybrid solar cells. Here, we use slot-die printing combined with wet chemistry to fabricate controllable mesoporous TiO2 nanostructures in large scale. Subsequently, the mesoporous TiO2 films with different pore size are backfilled with P3HT and PffBT4T-2OD, respectively, using two different ways of infiltration. TiO2 film morphology is investigated by scanning electron microscopy (SEM) and grazing incidence small-angle X-ray scattering (GISAXS). In order to investigate the effect of TiO2 pore size on the crystalline properties of the conjugated polymers P3HT and PffBT4T-2OD, e.g. lattice distance, crystal size or orientation, grazing incidence wide-angle X-ray scattering (GIWAXS) is applied to probe the hybrid films. Both P3HT and PffBT4T-2OD crystals with a denser packing of polymer chains exist in the large pore size of TiO2 films. For backfilling with PffBT4T-2OD, the face-on to edge-on ratio also prefers in the large-pore active layer.