Oriented thin films of mixture of a low-bandgap polymer and a fullerene derivative prepared by friction-transfer method
| Autor: | Nobutaka Tanigaki, Yousei Shibata, Tomoyuki Koganezawa, Tetsuhiko Miyadera, Toshiko Mizokuro |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
chemistry.chemical_classification
Materials science Fullerene Physics and Astronomy (miscellaneous) Organic solar cell Band gap General Engineering General Physics and Astronomy Heterojunction 02 engineering and technology Polymer 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Polymer solar cell 0104 chemical sciences Chemical engineering chemistry Crystallite Thin film 0210 nano-technology |
| Zdroj: | Japanese Journal of Applied Physics. 57:02CA06 |
| ISSN: | 1347-4065 0021-4922 |
| DOI: | 10.7567/jjap.57.02ca06 |
| Popis: | We have been studying oriented thin films of polymers fabricated by the friction-transfer method, which allows the alignment of a variety of conjugated polymers into highly oriented films. In this study, we prepared oriented blend films of a mixture of a low-bandgap polymer, poly{4,8-bis[(2-ethylhexyl)oxy]benzo[1,2-b:4,5-b']dithiophene-2,6-diyl-alt-3-fluoro-2-[(2-ethylhexyl)carbonyl]thieno[3,4-b]thiophene-4,6-diyl} (PTB7), and [6,6]-phenyl-C71-butyric acid methyl ester (PC71BM), which is a promising combination for application in organic solar cells. We obtained oriented blend films of PTB7 and PC71BM by the friction-transfer method from a solid block. Polarized UV–visible spectra show that the PTB7 chains were aligned parallel to the friction direction in the blend films. Grazing-incidence X-ray diffraction (GIXD) studies with synchrotron radiation suggested that the preferred orientation of PTB7 crystallites was face-on in the blend films. The GIXD results also showed the high uniaxial orientation of PTB7 chains in blend films. Photovoltaic devices were fabricated using the friction-transferred blend films of the PTB7 and PC71BM. These bulk heterojunction devices showed better performance than planar heterojunction devices fabricated using pure friction-transferred PTB7 films. |
| Databáze: | OpenAIRE |
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