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| Content Provider | Royal Society of Chemistry (RSC) |
|---|---|
| Author | Guilbert, A. A. Y. Cabral, J. T. |
| Copyright Year | 2017 |
| Abstract | We report the impact of the ternary solution phase behaviour on the film morphology and crystallization of a model polymer:fullerene system. We employ UV-Vis absorption spectroscopy, combined with sequential filtration and dilution, to establish the phase diagram for regio-random poly(3-hexylthiophene-2,5-diyl) and phenyl-C61-butyric acid methyl ester (PCBM) in chlorobenzene. Films are systematically cast from one- and two-phase regions decoupling homogeneous and heterogenous nucleation, and the role of pre-formed aggregates from solutions. Increasing annealing temperature from 120 to 200 °C reveals a highly non-monotonic nucleation profile with a maximum at 170 °C, while the crystal growth rate increases monotonically. UV ozonolysis is employed to vary substrate energy, and found to increase nucleation rate and to promote a binary crystallization process. As previously found, exposure to light, under an inert atmosphere, effectively suppresses homogeneous nucleation; however, it has a considerably smaller effect on heterogeneous nucleation, either from solution aggregates or substrate-driven. Our results establish a quantitative link between solution thermodynamics, crystallization and provide insight into morphological design based on processing parameters in a proxy organic photovoltaic system. |
| Starting Page | 827 |
| Ending Page | 835 |
| Page Count | 9 |
| File Format | HTM / HTML PDF |
| ISSN | 1744683X |
| Volume Number | 13 |
| Issue Number | 4 |
| Journal | Soft Matter |
| DOI | 10.1039/c6sm01183g |
| Language | English |
| Publisher | Royal Society of Chemistry |
| Access Restriction | Open |
| Subject Keyword | Fullerene Absorption spectroscopy Chlorobenzene Ozonolysis Ester Nucleation Phase diagram Photovoltaic system Polymer Phenyl-C61-butyric acid methyl ester Nucleic acid thermodynamics |
| Content Type | Text |
| Resource Type | Article |
| Subject | Chemistry Condensed Matter Physics |
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