Tuning local molecular orientation-composition correlations in binary organic thin films by solution shearing

Wei Ma, Julia Reinspach, Yan Zhou, Ying Diao, Terry McAfee, Stefan C.B. Mannsfeld, Zhenan Bao, Harald Ade

Research output: Contribution to journalArticlepeer-review

Abstract

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.

Original languageEnglish (US)
Pages (from-to)3131-3137
Number of pages7
JournalAdvanced Functional Materials
Volume25
Issue number21
DOIs
StatePublished - Jun 1 2015
Externally publishedYes

Keywords

  • X-ray scattering
  • molecular orientation
  • organic functional thin films
  • solution shearing

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

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