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Chemistry
Organic Conjugated Polymers: Synthesis and Structure-Property Studies. THILANGA LIYANAGE* and
MARK D. WATSON, Department of Chemistry, University of Kentucky, Lexington, KY 40506-0055.
X
X
Donor
Y
Acceptor
R
Y
R'
Solubility/Processability
Match solar spectrum
Device properties
in
e
Donor
R
Acceptor
Engineer
er
R'
Conjugated
Polymer
]n
e
in
En
g
[
g
En
er
Engineer
EHOMO
Long range order
Frontier Orbital Energies
Electron donating and accepting aromatics are functionalized through typical organic chemistry.
Functional groups X and Y allow their covalent linkage to high molecular weight semiconducting
conjugated polymers with repeating units of perfectly alternating donors and acceptors. The polymer side
groups R and R' are chosen to further engineer (opto)electronic properties, solubility, self assembly and
thermal properties all of which are critical to processing and operation of electronic devices based on
them. Specific targets include organic field effect transistors (OFET) with ambient operational stability
and organic photovoltaic diodes (OPV, a.k.a solar cell). The donor-acceptor architecture allows us to
easily tune frontier molecular orbital energies, imparting stability against redox chemistry with
atmospheric species like H2O and O2 and to match UV/Vis/NIR absorption profiles to the solar spectrum
to optimize OPV performance.
Related publications from our group:
1. Kim, F.S.; Guo, X.; Watson, M.D.; Jenekhe, S.A. "High-Mobility Ambipolar Transistors and HighGain Inverters from a Donor-Acceptor Copolymer Semiconductor" Adv. Mater. 2009, DOI
10.1002/adma.200901819
2. Xin, H.; Guo, X.; Kim, F.S.; Ren, G.; Watson, M.D.; Jenekhe, S.A. "Efficient Solar Cells based on a
New Phthalimide-Based Donor-Acceptor Copolymer Semiconductor: Morphology, Charge-Transport,
and Photovoltaic Properties" J. Mater. Chem. 2009, 19, 5303-10
3. Guo, X.; Kim, F.S.; Jenekhe, S.A.; Watson, M.D. "Phthalimide-Based Polymers for High Performance
Organic Thin-Film Transistors" J. Am. Chem. Soc. 2009, 131, 7206-7
4. Guo, X.; Watson, M.D. “Conjugated Polymers from Naphthalene Bisimide” Org. Lett. 2008, 10, 53336.
5. Wang,Y.; Watson, M.D. “Bithiophene-Perfluorobenzene Copolymers” Macromolecules, 2008, 41,
8643-7.