Germaindacenodithiophene based low band gap polymers for organic solar cells

Fei, Zhuping; Ashraf, Raja Shahid; Huang, Zhenggang; Smith, Jeremy; Kline, R. Joseph; D'Angelo, Pasquale; Anthopoulos, Thomas D.; Durrant, James R.; McCulloch, Iain; Heeney, Martin

CHEMICAL COMMUNICATIONS

2012

We report the first synthesis of a fused germaindacenodithiophene monomer and its polymerisation with 2,1,3-benzothiadiazole by Suzuki polycondensation. The resulting polymer, PGeTPTBT, is semicrystalline, despite the presence of four bulky 2-ethylhexyl groups. Blends with P70CBM afford solar cells with efficiencies of 5.02%.