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pentacene oligomers and polymers
Why pentacene?
Today, the field of organic
semiconductive materials is very active and has the potential to revolutionize
applications in photovoltaic cells, chemical sensors, and thin film
transistors (TFTs). The use of polycyclic aromatic hydrocarbons, such
as pentacene, has dominated most studies, but despite the substantial
research on pentacene devices, relatively few derivatives of pentacene
are known. To date, much of the work to enhance the performance of pentacene
based materials has been through device fabrication techniques rather
than synthetic modification of the pentacene skeleton. Only recently
has functionalization been used in an attempt to increase the semiconductive
properties (charge carrier mobilities) of pentacene based materials.
To achieve this goal, we are developing new synthetic methods for the
synthesis of oligomers and polymers that contain pentacene in the repeat
unit.
"Synthesis of Soluble Oligo- and Polymeric Pentacene-Based Materials,"
D.
Lehnherr,
R. McDonald, R.R. Tywkinski, Tetrahedron 2008, 64, 11449–11461
(part of the Symposium in Print: Carbon-Rich Nanostructures).
"Synthesis
of Conjugated Pentacene Dimers: Materials Toward Photoconductive Gain,"
D.
Lehnherr,
J.
Gao,
F. A. Hegmann, R. R. Tykwinski, Org. Lett. 2008, 10, 4779–4782.
"Exploring
Electronically Polarized Pentacenes, " D.
Lehnherr,
R. McDonald, R.R. Tykwinski, Org. Lett. 2008, 10, 4163–4166.
"Pentacene
Oligomers and Polymers: Functionalization of Pentacene to Afford Mono-,
Di-, Tri- and Polymeric Materials,” D.
Lehnherr, R. R. Tywkinski, Org. Lett. 2007,
9, 4583-4586
"Anisotropy
of transient photoconductivity in functionalized pentacene single crystals,”
O. Ostroverkhova, D.G.
Cooke, F. A. Hegmann R. R. Tykwinski S.
R. Parkin, J. E. Anthony, Appl. Phys. Lett. 2006
89, 192113.
"Optical
and transient photoconductive properties of pentacene and functionalized
pentacene thin films: Dependence on film morphology," O. Ostroverkhova,
S. Shcherbyna, D.G. Cooke, R.F. Egerton,
F.A. Hegmann, R.R. Tykwinski, S.R. Parkin, J.E. Anthony, J. Appl.
Phys. 2005, 98, 033701.
"Band-Like Transport in Pentacene and Functionalized Pentacene
Thin Films Revealed by Sub-Picosecond Transient Photoconductivity Measurements,"
O. Ostroverkhova, D.G. Cooke, S.
Shcherbyna, R. Egerton, F.A. Hegmann, R.R. Tykwinski, J. E. Anthony,
Phys. Rev. B 2005, 71, 035204.
"Picosecond Transient Photoconductivity in Functionalized Pentacene
Molecular Crystals Probed by Terahertz Pulse Spectroscopy," F.A.
Hegmann, R.R. Tykwinski, K.P.H.
Lui ,
J.E.
Bullock, J. E. Anthony, Phys. Rev. Lett., 2002,
89, 227403.
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