Germaindacenodithiophene based low band gap polymers for organic solar cells

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

doi:10.1039/C2CC17996B

Germaindacenodithiophene based low band gap polymers for organic solar cells†

Zhuping Fei,‡^a Raja Shahid Ashraf,‡^a Zhenggang Huang,^a Jeremy Smith,^b R. Joseph Kline,^c Pasquale D'Angelo,^b Thomas D. Anthopoulos,^b James R. Durrant,^a Iain McCulloch^a and Martin Heeney*^a

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^a Dept. Chemistry and Centre for Plastic Electronics, Imperial College London, London, UK
E-mail: m.heeney@imperial.ac.uk

^b Dept. Physics & Centre for Plastic Electronics, Imperial College, UK

^c Polymers Division, National Institute of Standards and Technology (NIST), Gaithersburg, Maryland 20899, United States

Abstract

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%.

Chemical Communications

Germaindacenodithiophene based low band gap polymers for organic solar cells†

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