Journal
MACROMOLECULES
Volume 40, Issue 23, Pages 8291-8301Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ma070712a
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In this study the morphology of spin-casted films of polymers blended with [6,6]-phenyl C-61-butyric acid methyl ester (PCBM) has been studied. It was found that the lateral structure formation in the films is favored by rapid solvent evaporation and strong polymer-PCBM repulsion. The formation of homogeneous films is favored by slow evaporation and weak polymer-PCBM repulsion. The effect of solvent evaporation rate is the opposite of what is found for spin-casting polymer-polymer blends. The results can be explained by the kinetics of phase separation and the phase behavior involving limited solubility and crystallization of PCBM.
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