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

*此作品的通信作者

研究成果: 雜誌貢獻期刊論文同行評審

55 引文 斯高帕斯(Scopus)

摘要

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.

原文英語
頁(從 - 到)6566-6574
頁數9
期刊Macromolecules
38
發行號15
DOIs
出版狀態已發佈 - 2005 七月 26

ASJC Scopus subject areas

  • 有機化學
  • 聚合物和塑料
  • 無機化學
  • 材料化學

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