Combinatorial Effects of Solvent Type, Thermal Annealing and Al Electrode on the Morphology of P3HT:PCBM Layer
Poly(3-hexylthiophene):phenyl-C61-butyric acid methyl ester (P3HT:PCBM) films were spin-cast using either pure chlorobenzene as the solvent or a chlorobenzene:dichlorobenzene solvent mixture. Compared to films fabricated using pure chlorobenzene, those prepared using the mixed solvent showed better crystallinity of the P3HT domains and a higher initial tensile strain. Thermal annealing relieved the tensile strain and increasing the domain crystallinity. The films spin-cast using the solvent mixture exhibited minimal Al atom diffusion into the P3HT:PCBM layer during thermal annealing. The presence of an Al layer enhanced the grazing incidence small angle X-ray scattering contrast between the P3HT and PCBM domains at the Al layer interface.
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Document Type: Research Article
Publication date: March 1, 2016
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