From the UV–vis absorption onsets, determined from the as-cast thin films, we determined the E g(opt) levels, which demonstrate a clear trend in the reduction of E g(opt) on increasing the conjugation length in the BXR series dropping from 1.92 eV to 1.74 eV.
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High performance p-type molecular electron donors for OPV applications via alkylthiophene catenation chromophore extension.
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