Journal
ADVANCED FUNCTIONAL MATERIALS
Volume 25, Issue 21, Pages 3131-3137Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.201500468
Keywords
molecular orientation; organic functional thin films; X-ray scattering; solution shearing
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Funding
- US Department of Energy, Office of Science, Basic Energy Science, Division of Materials Science and Engineering [DE-FG02-98ER45737]
- Office of Science, Office of Basic Energy Sciences of the US Department of Energy [DE-AC02-05CH11231]
- Department of Energy, Bridging Research Interactions through the collaborative Development Grants in Energy (BRIDGE) program [DE-FOA-0000654-1588]
- Office of Naval Research [N00014-14-1-0142]
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A general impact of solution shearing on molecular orientation correlation is observed in polymer:fullerene organic solar cells in which one of the components forms fibrils or aggregates. Further investigation with polarized soft X-ray scattering reveals that solution shearing induces more face-to-face orientation relative to the interface of two components compared to spin-coating. This impact is shearing speed dependent, that is, slow shearing speed can induce more face-to-face orientation than a fast shearing speed. These results demonstrate that solution shearing is an effective method to control the relative molecular orientation. Solution shearing can also modify the domain size and average composition variations.
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