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Solution‐Processable Donor–Acceptor Polymers with Modular Electronic Properties and Very Narrow Bandgaps
Author(s) -
Foster Michael E.,
Zhang Benjamin A.,
Murtagh Dustin,
Liu Yi,
Sfeir Matthew Y.,
Wong Bryan M.,
Azoulay Jason D.
Publication year - 2014
Publication title -
macromolecular rapid communications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.348
H-Index - 154
eISSN - 1521-3927
pISSN - 1022-1336
DOI - 10.1002/marc.201400228
Subject(s) - conjugated system , delocalized electron , materials science , polymer , absorption (acoustics) , acceptor , substituent , photochemistry , absorption spectroscopy , optoelectronics , chemistry , optics , organic chemistry , composite material , physics , condensed matter physics
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 ( E g opt < 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.