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Novel A-D-A-D-A-type oligothiophenes incorporating electron-withdrawing benzoc1,2,5thiadiazole (BTDA) as core and trifluoroacetyl (TFA) as terminal acceptor groups have been developed. Vacuum-processed planar heterojunction organic solar cells incorporating these new oligomers as donor and C(60) as acceptor showed very high open circuit voltages up to 1.17 V, resulting in power conversion efficiencies of 1.56% under AM1.5G conditions.
Steinberger et al. (Mon,) studied this question.