Vertical phase separation in spin-coated films of a low bandgap polyfluorene/PCBM blend - Effects of specific substrate interaction
Artikel i vetenskaplig tidskrift, 2007

We report on the effect of the substrate on the vertical phase separation in spin-coated thin films of poly [(9,9-dioctylfluorenyl-2,7-diyl)-co-5,5-4',7'-di-2-thienyl-2',1',3'-benz othiadiazole] (APFO-3) blended with [6,6]-phenyl-C-61-butyric acid methyl ester (PCBM). Compositional depth profiles of the films are measured by dynamic secondary ion mass spectrometry (SIMS). We found that changing the substrate from silicon to gold affects the composition profile near the substrate interface. This is caused by a specific interaction between the polymer (APFO-3) and the gold surface, as confirmed by X-ray photoelectron spectroscopy (XPS). The composition profile in the area away from the substrate interface, as well as the enrichment of the free surface with APFO-3, remain however unaffected by the choice of substrate. The vertical composition was also analysed for APFO-3:PCBM films spin-coated on indium tin oxide (ITO) coated with a thin layer of (3,4-ethylenedioxythiophene) poly(styrenesulfonate) (PEDOT:PSS). (c) 2006 Elsevier B.V. All rights reserved.

thiophene

conjugated polymer

ion mass spectrometry (SIMS)

CAST PS/PMMA

SOLAR-CELLS

CONJUGATED-POLYMER BLENDS

PERFORMANCE

SELF-ASSEMBLED MONOLAYERS

X-ray photoelectron spectroscopy (XPS)

spinodal decomposition

BLENDS

adsorption

THIN-FILMS

SURFACE

MORPHOLOGY

secondary

TECHNOLOGY

THIOPHENE

Författare

C. M. Bjorstrom

Karlstads universitet

Svante Nilsson

Karlstads universitet

Andrzej Bernasik

Akademia Gorniczo-Hutnicza im. Stanislawa Staszica w Krakowie

Andrzej Budkowski

Uniwersytet Jagiellonski w Krakowie

Mats Andersson

Chalmers, Kemi- och bioteknik, Polymerteknologi

Kjell Magnusson

Karlstads universitet

Ellen Moons

Karlstads universitet

Applied Surface Science

0169-4332 (ISSN)

Vol. 253 8 3906-3912

Ämneskategorier

Kemiteknik

DOI

10.1016/j.apsusc.2006.08.024