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Transmission electron diffraction study of a uniaxially-ordered high-mobility polymeric semiconductor.

Masayuki Sasaki1, Yu Yamashita1, Hiroyuki Matsui2

  • 1Department of Advanced Materials Science, Material Innovation Research Center (MIRC), Graduate School of Frontier Sciences, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba, Japan.

Microscopy (Oxford, England)
|January 5, 2019
PubMed
Summary
This summary is machine-generated.

Polymer semiconductor films show high mobility due to molecular alignment. Transmission electron diffraction confirmed this gentle winding arrangement, linking structure to performance.

Keywords:
TEDcurvature radiushigh mobilityorganic semiconductorpolymerrocking curve

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Area of Science:

  • Materials Science
  • Polymer Science
  • Organic Electronics

Background:

  • Polymeric semiconductors are crucial for organic electronics.
  • High-carrier mobility in 2,5-bis(3-hexadecylthiophen-2-yl)thieno(3,2-b)thiophene films is observed.
  • This performance is hypothesized to stem from uniaxial molecular alignment.

Purpose of the Study:

  • To experimentally verify the proposed uniaxial alignment of polymer molecules.
  • To investigate the relationship between molecular structure and carrier mobility.
  • To quantify the degree and nature of polymer chain alignment.

Main Methods:

  • Thin films of the polymeric semiconductor were prepared using compression with a glass blade.
  • Transmission electron diffraction was employed to analyze local polymer alignment.
  • Diffraction spot analysis was used to determine molecular orientation and curvature.

Main Results:

  • Arc-like intensity distributions were observed in diffraction spots corresponding to π-π stacking layers.
  • The arc angle varied with the analyzed area diameter (11.6°, 15.8°, 25.4° for 70, 140, 280 nm areas).
  • This indicates a gentle winding state of polymer chains with an average radius of curvature of approximately 630 nm.

Conclusions:

  • The experimental results support the hypothesis of uniaxial alignment in the polymer semiconductor films.
  • The observed gentle winding of polymer chains is directly linked to the high-carrier mobility.
  • This study provides direct evidence for structure-property relationships in organic semiconductors.