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The Unusual Effect of Bandgap Lowering by C 60 on a Conjugated Polymer
Author(s) -
Sonmez G.,
Shen C. K. F.,
Rubin Y.,
Wudl F.
Publication year - 2005
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.200306494
Subject(s) - materials science , thiophene , pyrazine , conjugated system , polymer , covalent bond , band gap , monomer , fullerene , organic solar cell , photochemistry , electron acceptor , acceptor , photovoltaics , fabrication , polymer chemistry , nanotechnology , optoelectronics , organic chemistry , photovoltaic system , chemistry , ecology , physics , composite material , biology , condensed matter physics , medicine , alternative medicine , pathology
Polymers with lowered bandgaps (see Figure) are produced from monomers containing a bisfulleroid as an electron‐acceptor and thiophene as an electron‐donor, fused by a thieno[3,4‐b]pyrazine bridge. The bandgaps could reach as low as 0.25 eV. Electron flow from the poly(thiophene) backbone to the fullerene through the covalently bound thieno[3,4‐b]pyrazine unit in the ground state makes this polymer a good candidate for the fabrication of photovoltaics and photoconductors.