A series of isoindigo-based low band gap polymers with cyclopentadithiophene (CPDT) as donor, decorated with different side chains, have been synthesized by Stille cross-coupling reaction as shown in Figure 1. The influences of side chain on the optical, electrochemical and crystalline properties of polymers have been investigated. These polymers show broad and strong absorption covering all the entire visible range and their maxima absorption shift with different side chain. From thin film WAXS results, d-spacings increases with longer side chain length. From what were observed, the blend of the polymer with short branched side chain with PCBM would obtain an optimized nano structure which may benefit the solar cell based on it.            

Synthesis and side chain effect on optoelectronic properties of isoindigo-based low band gap polymers

243rd National Meeting (2012)

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