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The Unusual Effect of Bandgap Lowering by C60 on a Conjugated Polymer


  • We gratefully acknowledge financial support from the Air Force Office of Scientific Research through F49620-00-1-0103 and the Army Research Office through MURI DAAD19-99-1-0316. Instrumentation for this research was partially funded by NSF grant DGE-0114443. The authors thank Prof. John R. Reynolds, University of Florida, for helpful comments.


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.

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