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Remarkable order of a high-performance polymer.

Authors
  • Takacs, Christopher J
  • Treat, Neil D
  • Krämer, Stephan
  • Chen, Zhihua
  • Facchetti, Antonio
  • Chabinyc, Michael L
  • Heeger, Alan J
Type
Published Article
Journal
Nano Letters
Publisher
American Chemical Society
Publication Date
Jun 12, 2013
Volume
13
Issue
6
Pages
2522–2527
Identifiers
DOI: 10.1021/nl4005805
PMID: 23647319
Source
Medline
License
Unknown

Abstract

We directly image the rich nanoscale organization of the high performance, n-type polymer poly{[N,N'-bis(2-octyldodecyl)-naphthalene-1,4,5,8-bis(dicarboximide)-2,6-diyl]-alt-5,5'-(2,2'-bithiophene)} (P(NDI2OD-T2)) using a combination of high-resolution transmission electron microscopy and scanning transmission electron microscopy. We demonstrate that it is possible to spatially resolve "face-on" lamella through the 2.4 nm alkyl stacking distance corresponding to the (100) reflection. The lamella locally transition between ordered and disordered states over a length scale on the order of 10 nm; however, the polymer backbones retain long-range correlations over length-scales approaching a micrometer. Moreover, we frequently observe overlapping structure implying a number of layers may exist throughout the thickness of the film (~20 nm). The results provide a simple picture, a highly ordered lamella nanostructure over nearly the entire film and ordered domains with overlapping layers providing additional interconnectivity, which unifies prior seemingly contradictory conclusions surrounding this remarkable, high-mobility material.

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