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

Research output: Contribution to journalResearch articleContributedpeer-review

Contributors

  • Wei Ma - , Xi'an Jiaotong University (Author)
  • Julia Reinspach - , Stanford University (Author)
  • Yan Zhou - , Stanford University (Author)
  • Ying Diao - , Stanford University (Author)
  • Terry McAfee - , North Carolina State University (Author)
  • Stefan C.B. Mannsfeld - , SLAC National Accelerator Laboratory (Author)
  • Zhenan Bao - , Stanford University (Author)
  • Harald Ade - , North Carolina State University (Author)

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.

Details

Original languageEnglish
Pages (from-to)3131-3137
Number of pages7
JournalAdvanced functional materials
Volume25
Issue number21
Publication statusPublished - 1 Jun 2015
Peer-reviewedYes
Externally publishedYes

Keywords

Research priority areas of TU Dresden

Keywords

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