Morphology and charge transport in poly(2-methoxy-5-(2′-ethylhexyloxy)-1,4-phenylenevinylene) films

U. Jeng, C. H. Hsu, H. S. Sheu, H. Y. Lee, A. R. Inigo, Hsiang-Chih Chiu, W. S. Fann, S. H. Chen, A. C. Su, T. L. Lin, K. Y. Peng, S. A. Chen

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55 Citations (Scopus)

Abstract

Structural characteristics of optical quality poly(2-methoxy-5-(2′-ethylhexyloxy)-1,4-phenylenevinylene) (MEH-PPV) films drop-cast from toluene solutions have been examined by use of wide-angle (WAXS) and small-angle X-ray scattering (SAXS) as well as field-emission scanning electron microscopy. For the as-cast film SAXS and WAXS patterns clearly suggest existence of nanodomains of mesomorphic order. Under grazing incidence, both SAXS and WAXS patterns of the as-cast film exhibit impressive uniaxial symmetry with strong scattering along the film normal; however, the corresponding normal-incidence patterns are circularly isotropic, implying in-plane random orientation. A structural model consisting of preferentially uniaxial-oriented nanodomains and disordered matrix is therefore proposed for the as-cast film. Annealing at 210°C results in disorientation of nanodomains: this decrease in structural asymmetry upon heat treatment correlates well with concomitant changes in charge transport behavior determined from time-of-flight measurements, manifesting dramatically decreased charge mobility as well as transition from nondispersive to dispersive modes.

Original languageEnglish
Pages (from-to)6566-6574
Number of pages9
JournalMacromolecules
Volume38
Issue number15
DOIs
Publication statusPublished - 2005 Jul 26

ASJC Scopus subject areas

  • Organic Chemistry
  • Polymers and Plastics
  • Inorganic Chemistry
  • Materials Chemistry

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    Jeng, U., Hsu, C. H., Sheu, H. S., Lee, H. Y., Inigo, A. R., Chiu, H-C., Fann, W. S., Chen, S. H., Su, A. C., Lin, T. L., Peng, K. Y., & Chen, S. A. (2005). Morphology and charge transport in poly(2-methoxy-5-(2′-ethylhexyloxy)-1,4-phenylenevinylene) films. Macromolecules, 38(15), 6566-6574. https://doi.org/10.1021/ma050367u