Abstract
A series of poly(dodecylthienylenevinylenes), C12-PTVs-a:b, with tunable regioregularity and solubility have been synthesized using two isomeric comonomers with molar ratios from 0:10 to 5:5, and characterized by NMR spectroscopy, differential scanning calorimetry, absorption spectroscopy, cyclovoltammetry, and X-ray diffraction. For the first time, the aromatic and olefinic 1H NMR peaks of regioregular head–tail Cn-PTVs are clearly assigned. No major difference in XRD peak intensity is observed among regiorandom and fully regioregular C12-PTVs. Voc of C12-PTVs-a:b and PC60BM blend solar cells are in the range of 0.43 to 0.51 V and consistently decrease as regioregularity is reduced. C12-PTV-3:7:PC60BM solar cells give the highest short-circuit current and practically same efficiency as that of C12-PTV-1:9:PC60BM devices. The results suggest a new strategy to enhance processability of optoelectronic polymers without sacrificing their crystallinity and device performance.
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