Effect of chalcogens on electronic and photophysical properties of vinylene-based diketopyrrolopyrrole copolymers
Author
Dhar, J.
Mukhopadhay, T.
Yaacobi-Gross, N.
Anthopoulos, T. D.
Salzner, U.
Swaraj, S.
Patil, S.
Date
2015Source Title
Journal of Physical Chemistry B
Print ISSN
1520-6106
Electronic ISSN
1520-5207
Publisher
American Chemical Society
Volume
119
Issue
34
Pages
11307 - 11316
Language
English
Type
ArticleItem Usage Stats
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Abstract
Three vinylene linked diketopyrrolopyrrole based donor−acceptor (D−A)
copolymers have been synthesized with phenyl, thienyl, and selenyl units as donors. Optical
and electronic properties were investigated with UV−vis absorption spectroscopy, cyclic
voltammetry, near edge X-ray absorption spectroscopy, organic field effect transistor (OFET)
measurements, and density functional theory (DFT) calculations. Optical and electrochemical
band gaps decrease in the order phenyl, thienyl, and selenyl. Only phenyl-based polymers are
nonplanar, but the main contributor to the larger band gap is electronic, not structural effects.
Thienyl and selenyl polymers exhibit ambipolar charge transport but with higher hole than
electron mobility. Experimental and theoretical results predict the selenyl system to have the
best transport properties, but OFET measurements prove the thienyl system to be superior
with p-channel mobility as high as 0.1 cm2 V−1 s
−1.
Keywords
Cyclic voltammetryElectronic properties
Energy gap
Field effect transistors
Hole mobility
Organic field effect transistors
Polymers
Ultraviolet spectroscopy
X ray absorption spectroscopy
Ambipolar charge transports
Chemical equations
Diketopyrrolopyrroles
Near edge x-ray absorption spectroscopies
Optical and electronic properties
Photophysical properties
Structural effect
UV-Vis absorption spectroscopy
Density functional theory