1. Solution-Processable Donor-Acceptor Polymers with Modular Electronic Properties and Very Narrow Bandgaps.
- Author
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Foster, Michael E., Zhang, Benjamin A., Murtagh, Dustin, Liu, Yi, Sfeir, Matthew Y., Wong, Bryan M., and Azoulay, Jason D.
- Subjects
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BAND gaps , *POLYMERIZATION , *ORGANIC semiconductors , *COPOLYMERS , *THIOPHENE derivatives , *ELECTRIC conductivity - Abstract
Bridgehead imine-substituted cyclopentadithiophene structural units, in combination with highly electronegative acceptors that exhibit progressively delocalized π-systems, afford donor-acceptor (DA) conjugated polymers with broad absorption profiles that span technologically relevant wavelength (λ) ranges from 0.7 < λ < 3.2 μm. A joint theoretical and experimental study demonstrates that the presence of the cross-conjugated substituent at the donor bridgehead position results in the capability to fine-tune structural and electronic properties so as to achieve very narrow optical bandgaps ( Egopt < 0.5 eV). This strategy affords modular DA copolymers with broad- and long-wavelength light absorption in the infrared and materials with some of the narrowest bandgaps reported to date. [ABSTRACT FROM AUTHOR]
- Published
- 2014
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