Effect of the π-conjugation length on the properties and photovoltaic performance of A-π-D-π-A type oligothiophenes with a 4,8-bis(thienyl)benzo[1,2-<i>b</i>:4,5-<i>b</i>']dithiophene core.

The first oxidation potentials ( E 0 ox vs Fc + /Fc) for COOP- n HT-TBDTs were measured to be 0.66, 0.50, 0.42, and 0.32 V, for n = 1, 2, 3, and 4, respectively, indicating a decreasing trend with the increase of the π-bridge chain length.

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