4.6 Article

Probing thin-film morphology of conjugated polymers by Raman spectroscopy

期刊

JOURNAL OF APPLIED PHYSICS
卷 107, 期 2, 页码 -

出版社

AMER INST PHYSICS
DOI: 10.1063/1.3276257

关键词

interface states; organic semiconductors; photoluminescence; quartz; Raman spectra; semiconductor thin films; surface morphology

资金

  1. EPSRC [GR/S99075/02]
  2. Engineering and Physical Sciences Research Council [GR/S99075/01, GR/S99075/02] Funding Source: researchfish

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We use Raman spectroscopy to investigate the thin-film morphology of conjugated polymers [poly(9,9-di-n-octylfluorene-alt-benzothiadiazole (F8BT)] in terms of the polymer chain conformation at interfaces with quartz, a crosslinked benzocyclobutene derivative, polyvinylphenol, and poly(3,4-ethylenedioxythiophene):poly(styrenesulphonate). The polymer chains near the substrate interface adopt a more planar conformation (lower torsion angle between fluorene and benzothiadiazole units) than chains in the bulk of the film for all substrates studied. On annealing, polymer chains both near the interface and in the bulk of the film adopt more planar conformations than in their pristine states but to a different degree. The influence of F8BT molecular weight on polymer chain conformation near the substrate interface is also examined. These results are confirmed by additional absorption and photoluminescence measurements.

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