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- Title
Solution-Processable Donor-Acceptor Polymers with Modular Electronic Properties and Very Narrow Bandgaps.
- Authors
Foster, Michael E.; Zhang, Benjamin A.; Murtagh, Dustin; Liu, Yi; Sfeir, Matthew Y.; Wong, Bryan M.; Azoulay, Jason D.
- 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.
- Subjects
BAND gaps; POLYMERIZATION; ORGANIC semiconductors; COPOLYMERS; THIOPHENE derivatives; ELECTRIC conductivity
- Publication
Macromolecular Rapid Communications, 2014, Vol 35, Issue 17, p1516
- ISSN
1022-1336
- Publication type
Article
- DOI
10.1002/marc.201400228