skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: A molecular design principle of lyotropic liquid-crystalline conjugated polymers with directed alignment capability for plastic electronics

Abstract

Conjugated polymers with a one-dimensional p-orbital overlap exhibit optoelectronic anisotropy. Their unique anisotropic properties can be fully realized in device applications only when the conjugated chains are aligned. Here, we report a molecular design principle of conjugated polymers to achieve concentration-regulated chain planarization, self-assembly, liquid-crystal-like good mobility and non-interdigitated side chains. As a consequence of these intra- and intermolecular attributes, chain alignment along an applied flow field occurs. This liquid-crystalline conjugated polymer was realized by incorporating intramolecular sulphur–fluorine interactions and bulky side chains linked to a tetrahedral carbon having a large form factor. By optimizing the polymer concentration and the flow field, we could achieve a high dichroic ratio of 16.67 in emission from conducting conjugated polymer films. Two-dimensional grazing-incidence X-ray diffraction was performed to analyse a well-defined conjugated polymer alignment. Thin-film transistors built on highly aligned conjugated polymer films showed more than three orders of magnitude faster carrier mobility along the conjugated polymer alignment direction than the perpendicular direction.

Authors:
; ; ; ; ;
Publication Date:
Research Org.:
Energy Frontier Research Centers (EFRC) (United States). Center for Solar and Thermal Energy Conversion (CSTEC)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1382307
DOE Contract Number:  
SC0000957
Resource Type:
Journal Article
Journal Name:
Nature Materials
Additional Journal Information:
Journal Volume: 12; Journal Issue: 7; Related Information: CSTEC partners with University of Michigan (lead); Kent State University; Journal ID: ISSN 1476-1122
Publisher:
Nature Publishing Group
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; solar (photovoltaic), solar (thermal), phonons, thermal conductivity, thermoelectric, electrodes - solar, defects, charge transport, materials and chemistry by design, optics, synthesis (novel materials), synthesis (self-assembly)

Citation Formats

Kim, Bong-Gi, Jeong, Eun Jeong, Chung, Jong Won, Seo, Sungbaek, Koo, Bonwon, and Kim, Jinsang. A molecular design principle of lyotropic liquid-crystalline conjugated polymers with directed alignment capability for plastic electronics. United States: N. p., 2013. Web. doi:10.1038/NMAT3595.
Kim, Bong-Gi, Jeong, Eun Jeong, Chung, Jong Won, Seo, Sungbaek, Koo, Bonwon, & Kim, Jinsang. A molecular design principle of lyotropic liquid-crystalline conjugated polymers with directed alignment capability for plastic electronics. United States. doi:10.1038/NMAT3595.
Kim, Bong-Gi, Jeong, Eun Jeong, Chung, Jong Won, Seo, Sungbaek, Koo, Bonwon, and Kim, Jinsang. Sun . "A molecular design principle of lyotropic liquid-crystalline conjugated polymers with directed alignment capability for plastic electronics". United States. doi:10.1038/NMAT3595.
@article{osti_1382307,
title = {A molecular design principle of lyotropic liquid-crystalline conjugated polymers with directed alignment capability for plastic electronics},
author = {Kim, Bong-Gi and Jeong, Eun Jeong and Chung, Jong Won and Seo, Sungbaek and Koo, Bonwon and Kim, Jinsang},
abstractNote = {Conjugated polymers with a one-dimensional p-orbital overlap exhibit optoelectronic anisotropy. Their unique anisotropic properties can be fully realized in device applications only when the conjugated chains are aligned. Here, we report a molecular design principle of conjugated polymers to achieve concentration-regulated chain planarization, self-assembly, liquid-crystal-like good mobility and non-interdigitated side chains. As a consequence of these intra- and intermolecular attributes, chain alignment along an applied flow field occurs. This liquid-crystalline conjugated polymer was realized by incorporating intramolecular sulphur–fluorine interactions and bulky side chains linked to a tetrahedral carbon having a large form factor. By optimizing the polymer concentration and the flow field, we could achieve a high dichroic ratio of 16.67 in emission from conducting conjugated polymer films. Two-dimensional grazing-incidence X-ray diffraction was performed to analyse a well-defined conjugated polymer alignment. Thin-film transistors built on highly aligned conjugated polymer films showed more than three orders of magnitude faster carrier mobility along the conjugated polymer alignment direction than the perpendicular direction.},
doi = {10.1038/NMAT3595},
journal = {Nature Materials},
issn = {1476-1122},
number = 7,
volume = 12,
place = {United States},
year = {2013},
month = {3}
}

Works referenced in this record:

A strong regioregularity effect in self-organizing conjugated polymer films and high-efficiency polythiophene:fullerene solar cells
journal, February 2006

  • Kim, Youngkyoo; Cook, Steffan; Tuladhar, Sachetan M.
  • Nature Materials, Vol. 5, Issue 3
  • DOI: 10.1038/nmat1574

Liquid-crystalline semiconducting polymers with high charge-carrier mobility
journal, March 2006

  • McCulloch, Iain; Heeney, Martin; Bailey, Clare
  • Nature Materials, Vol. 5, Issue 4
  • DOI: 10.1038/nmat1612

Improving the performance of doped π-conjugated polymers for use in organic light-emitting diodes
journal, June 2000

  • Gross, Markus; Müller, David C.; Nothofer, Heinz-Georg
  • Nature, Vol. 405, Issue 6787
  • DOI: 10.1038/35015037

Contact-induced crystallinity for high-performance soluble acene-based transistors and circuits
journal, February 2008

  • Gundlach, D. J.; Royer, J. E.; Park, S. K.
  • Nature Materials, Vol. 7, Issue 3, p. 216-221
  • DOI: 10.1038/nmat2122

Discovery of New Fluorescent Materials from Fast Synthesis and Screening of Conjugated Polymers
journal, May 2002

  • Lavastre, Olivier; Illitchev, Ilya; Jegou, Gwenaelle
  • Journal of the American Chemical Society, Vol. 124, Issue 19
  • DOI: 10.1021/ja025764o

Polarized light emission from LEDs prepared by the Langmuir-Blodgett technique
journal, February 1996


Charge Transport Properties in Discotic Liquid Crystals:  A Quantum-Chemical Insight into Structure−Property Relationships
journal, March 2004

  • Lemaur, Vincent; da Silva Filho, Demetrio A.; Coropceanu, Veaceslav
  • Journal of the American Chemical Society, Vol. 126, Issue 10
  • DOI: 10.1021/ja0390956

Two-dimensional charge transport in self-organized, high-mobility conjugated polymers
journal, October 1999

  • Sirringhaus, H.; Brown, P. J.; Friend, R. H.
  • Nature, Vol. 401, Issue 6754, p. 685-688
  • DOI: 10.1038/44359

Blue Polarized Electroluminescence from a Liquid Crystalline Polyfluorene
journal, June 1999


The Influence of Morphology on High-Performance Polymer Field-Effect Transistors
journal, January 2009

  • Tsao, Hoi Nok; Cho, Don; Andreasen, Jens Wenzel
  • Advanced Materials, Vol. 21, Issue 2
  • DOI: 10.1002/adma.200802032

Control of conformational and interpolymer effects in conjugated polymers
journal, June 2001


A glass-forming conjugated main-chain liquid crystal polymer for polarized electroluminescence applications
journal, January 1997

  • Grell, Martin; Bradley, Donal D. C.; Inbasekaran, Mike
  • Advanced Materials, Vol. 9, Issue 10
  • DOI: 10.1002/adma.19970091006

Polymer solar cells with enhanced open-circuit voltage and efficiency
journal, November 2009

  • Chen, Hsiang-Yu; Hou, Jianhui; Zhang, Shaoqing
  • Nature Photonics, Vol. 3, Issue 11, p. 649-653
  • DOI: 10.1038/nphoton.2009.192

Surface-mediated alignment of nematic liquid crystals with polarized laser light
journal, May 1991

  • Gibbons, Wayne M.; Shannon, Paul J.; Sun, Shao-Tang
  • Nature, Vol. 351, Issue 6321
  • DOI: 10.1038/351049a0

Uniaxial Alignment of Liquid-Crystalline Conjugated Polymers by Nanoconfinement
journal, April 2007

  • Zheng, Zijian; Yim, Keng-Hoong; Saifullah, Mohammad S. M.
  • Nano Letters, Vol. 7, Issue 4
  • DOI: 10.1021/nl070022k

Chemical Sensors Based on Amplifying Fluorescent Conjugated Polymers
journal, April 2007

  • Thomas, Samuel W.; Joly, Guy D.; Swager, Timothy M.
  • Chemical Reviews, Vol. 107, Issue 4
  • DOI: 10.1021/cr0501339

Bulk heterojunction solar cells with internal quantum efficiency approaching 100%
journal, April 2009

  • Park, Sung Heum; Roy, Anshuman; Beaupré, Serge
  • Nature Photonics, Vol. 3, Issue 5, p. 297-302
  • DOI: 10.1038/nphoton.2009.69

Ultrahigh Mobility in Polymer Field-Effect Transistors by Design
journal, March 2011

  • Tsao, Hoi Nok; Cho, Don M.; Park, Insun
  • Journal of the American Chemical Society, Vol. 133, Issue 8
  • DOI: 10.1021/ja108861q

Incorporation of Photoluminescent Polarizers into Liquid Crystal Displays
journal, February 1998


Polydiacetylene-Liposome Microarrays for Selective and Sensitive Mercury(II) Detection
journal, September 2009


Nanoscale Fibrils and Grids:  Aggregated Structures from Rigid-Rod Conjugated Polymers
journal, March 1999

  • Kim, Jinsang; McHugh, Sean K.; Swager, Timothy M.
  • Macromolecules, Vol. 32, Issue 5
  • DOI: 10.1021/ma981774r