Doping of conjugated polythiophenes with alkyl silanes

Chi Yueh Kao, Bumsu Lee, Leszek S. Wielunski, Martin Heeney, Iain McCulloch, Eric Garfunkel, Leonard C Feldman, Vitaly Podzorov

Research output: Contribution to journalArticle

66 Citations (Scopus)

Abstract

A strong modification of the electronic properties of solution-processable conjugated polythiophenes by self-assembled silane molecules is reported. Upon bulk doping with hydrolized fluoroalkyl trichlorosilane, the electrical conductivity of ultrathin polythiophene films increases by up to six orders of magnitude, reaching record values for polythiophenes: (1.1±0.1) ×103S cm-1 for poly(2,5-bis(3-tetradecylthiophen -2-yl)thieno[3,2-b]thiophene) (PBTTT) and 50±20 S cm-1 for poly(3-hexyl)thiophene (P3HT). Interband optical absorption of the polymers in the doped state is drastically reduced, making these highly conductive films transparent in the visible range. The dopants within the porous polymer matrix are partially crosslinked via a silane self-polymerization mechanism that makes the samples very stable in vacuum and nonpolar environments. The mechanism of SAM-induced conductivity is believed to be based on protonic doping by the free silanol groups available within the partially crosslinkedSAMnetwork incorporated in the polythiophene structure. The SAM-doped polythiophenes exhibit an intrinsic sensing effect: a drastic and reversible change in conductivity in response to ambient polar molecules, which is believed to be due to the interaction of the silanol groups with polar analytes. The reported electronic effects point to a new attractive route for doping conjugated polymers with potential applications in transparent conductors and molecular sensors.

Original languageEnglish
Pages (from-to)1906-1911
Number of pages6
JournalAdvanced Functional Materials
Volume19
Issue number12
DOIs
Publication statusPublished - Jun 23 2009

Fingerprint

Silanes
silanes
Doping (additives)
thiophenes
polymers
Polymers
Thiophenes
conductivity
Thiophene
electronics
molecules
optical absorption
polymerization
conductors
routes
Conductive films
Molecules
Conjugated polymers
vacuum
electrical resistivity

ASJC Scopus subject areas

  • Biomaterials
  • Electrochemistry
  • Condensed Matter Physics
  • Electronic, Optical and Magnetic Materials

Cite this

Kao, C. Y., Lee, B., Wielunski, L. S., Heeney, M., McCulloch, I., Garfunkel, E., ... Podzorov, V. (2009). Doping of conjugated polythiophenes with alkyl silanes. Advanced Functional Materials, 19(12), 1906-1911. https://doi.org/10.1002/adfm.200900120

Doping of conjugated polythiophenes with alkyl silanes. / Kao, Chi Yueh; Lee, Bumsu; Wielunski, Leszek S.; Heeney, Martin; McCulloch, Iain; Garfunkel, Eric; Feldman, Leonard C; Podzorov, Vitaly.

In: Advanced Functional Materials, Vol. 19, No. 12, 23.06.2009, p. 1906-1911.

Research output: Contribution to journalArticle

Kao, CY, Lee, B, Wielunski, LS, Heeney, M, McCulloch, I, Garfunkel, E, Feldman, LC & Podzorov, V 2009, 'Doping of conjugated polythiophenes with alkyl silanes', Advanced Functional Materials, vol. 19, no. 12, pp. 1906-1911. https://doi.org/10.1002/adfm.200900120
Kao CY, Lee B, Wielunski LS, Heeney M, McCulloch I, Garfunkel E et al. Doping of conjugated polythiophenes with alkyl silanes. Advanced Functional Materials. 2009 Jun 23;19(12):1906-1911. https://doi.org/10.1002/adfm.200900120
Kao, Chi Yueh ; Lee, Bumsu ; Wielunski, Leszek S. ; Heeney, Martin ; McCulloch, Iain ; Garfunkel, Eric ; Feldman, Leonard C ; Podzorov, Vitaly. / Doping of conjugated polythiophenes with alkyl silanes. In: Advanced Functional Materials. 2009 ; Vol. 19, No. 12. pp. 1906-1911.
@article{f735d788f474430983c5b782c69e9189,
title = "Doping of conjugated polythiophenes with alkyl silanes",
abstract = "A strong modification of the electronic properties of solution-processable conjugated polythiophenes by self-assembled silane molecules is reported. Upon bulk doping with hydrolized fluoroalkyl trichlorosilane, the electrical conductivity of ultrathin polythiophene films increases by up to six orders of magnitude, reaching record values for polythiophenes: (1.1±0.1) ×103S cm-1 for poly(2,5-bis(3-tetradecylthiophen -2-yl)thieno[3,2-b]thiophene) (PBTTT) and 50±20 S cm-1 for poly(3-hexyl)thiophene (P3HT). Interband optical absorption of the polymers in the doped state is drastically reduced, making these highly conductive films transparent in the visible range. The dopants within the porous polymer matrix are partially crosslinked via a silane self-polymerization mechanism that makes the samples very stable in vacuum and nonpolar environments. The mechanism of SAM-induced conductivity is believed to be based on protonic doping by the free silanol groups available within the partially crosslinkedSAMnetwork incorporated in the polythiophene structure. The SAM-doped polythiophenes exhibit an intrinsic sensing effect: a drastic and reversible change in conductivity in response to ambient polar molecules, which is believed to be due to the interaction of the silanol groups with polar analytes. The reported electronic effects point to a new attractive route for doping conjugated polymers with potential applications in transparent conductors and molecular sensors.",
author = "Kao, {Chi Yueh} and Bumsu Lee and Wielunski, {Leszek S.} and Martin Heeney and Iain McCulloch and Eric Garfunkel and Feldman, {Leonard C} and Vitaly Podzorov",
year = "2009",
month = "6",
day = "23",
doi = "10.1002/adfm.200900120",
language = "English",
volume = "19",
pages = "1906--1911",
journal = "Advanced Functional Materials",
issn = "1616-301X",
publisher = "Wiley-VCH Verlag",
number = "12",

}

TY - JOUR

T1 - Doping of conjugated polythiophenes with alkyl silanes

AU - Kao, Chi Yueh

AU - Lee, Bumsu

AU - Wielunski, Leszek S.

AU - Heeney, Martin

AU - McCulloch, Iain

AU - Garfunkel, Eric

AU - Feldman, Leonard C

AU - Podzorov, Vitaly

PY - 2009/6/23

Y1 - 2009/6/23

N2 - A strong modification of the electronic properties of solution-processable conjugated polythiophenes by self-assembled silane molecules is reported. Upon bulk doping with hydrolized fluoroalkyl trichlorosilane, the electrical conductivity of ultrathin polythiophene films increases by up to six orders of magnitude, reaching record values for polythiophenes: (1.1±0.1) ×103S cm-1 for poly(2,5-bis(3-tetradecylthiophen -2-yl)thieno[3,2-b]thiophene) (PBTTT) and 50±20 S cm-1 for poly(3-hexyl)thiophene (P3HT). Interband optical absorption of the polymers in the doped state is drastically reduced, making these highly conductive films transparent in the visible range. The dopants within the porous polymer matrix are partially crosslinked via a silane self-polymerization mechanism that makes the samples very stable in vacuum and nonpolar environments. The mechanism of SAM-induced conductivity is believed to be based on protonic doping by the free silanol groups available within the partially crosslinkedSAMnetwork incorporated in the polythiophene structure. The SAM-doped polythiophenes exhibit an intrinsic sensing effect: a drastic and reversible change in conductivity in response to ambient polar molecules, which is believed to be due to the interaction of the silanol groups with polar analytes. The reported electronic effects point to a new attractive route for doping conjugated polymers with potential applications in transparent conductors and molecular sensors.

AB - A strong modification of the electronic properties of solution-processable conjugated polythiophenes by self-assembled silane molecules is reported. Upon bulk doping with hydrolized fluoroalkyl trichlorosilane, the electrical conductivity of ultrathin polythiophene films increases by up to six orders of magnitude, reaching record values for polythiophenes: (1.1±0.1) ×103S cm-1 for poly(2,5-bis(3-tetradecylthiophen -2-yl)thieno[3,2-b]thiophene) (PBTTT) and 50±20 S cm-1 for poly(3-hexyl)thiophene (P3HT). Interband optical absorption of the polymers in the doped state is drastically reduced, making these highly conductive films transparent in the visible range. The dopants within the porous polymer matrix are partially crosslinked via a silane self-polymerization mechanism that makes the samples very stable in vacuum and nonpolar environments. The mechanism of SAM-induced conductivity is believed to be based on protonic doping by the free silanol groups available within the partially crosslinkedSAMnetwork incorporated in the polythiophene structure. The SAM-doped polythiophenes exhibit an intrinsic sensing effect: a drastic and reversible change in conductivity in response to ambient polar molecules, which is believed to be due to the interaction of the silanol groups with polar analytes. The reported electronic effects point to a new attractive route for doping conjugated polymers with potential applications in transparent conductors and molecular sensors.

UR - http://www.scopus.com/inward/record.url?scp=67649206021&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=67649206021&partnerID=8YFLogxK

U2 - 10.1002/adfm.200900120

DO - 10.1002/adfm.200900120

M3 - Article

AN - SCOPUS:67649206021

VL - 19

SP - 1906

EP - 1911

JO - Advanced Functional Materials

JF - Advanced Functional Materials

SN - 1616-301X

IS - 12

ER -