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Silaindacenodithiophene‐Based Low Band Gap Polymers – The Effect of Fluorine Substitution on Device Performances and Film Morphologies

2012; Wiley; Volume: 22; Issue: 8 Linguagem: Inglês

10.1002/adfm.201102941

1616-3028

Bob C. Schroeder, Zhenggang Huang, Raja Shahid Ashraf, Jeremy Smith, Pasquale D’Angelo, Scott E. Watkins, Thomas D. Anthopoulos, James R. Durrant, Iain McCulloch,

Organic Light-Emitting Diodes Research

Abstract Silaindacenodithiophene is copolymerized with benzo[ c ][1,2,5]thiadiazole ( BT ) and 4,7‐di(thiophen‐2‐yl)benzo[ c ][1,2,5]thiadiazole ( DTBT ), respectively their fluorinated counter parts 5,6‐difluorobenzo[ c ][1,2,5]thiadiazole ( 2FBT ) and 5,6‐difluoro‐4,7‐di(thiophen‐2‐yl) benzo[ c ][1,2,5]thiadiazole ( 2FDTBT ). The influence of the thienyl spacers and fluorine atoms on molecular packing and active layer morphology is investigated with regard to device performances. bulk heterojunction (BHJ) solar cells based on silaindacenodithiophene donor‐acceptor polymers achieved PCE's of 4.5% and hole mobilities of as high as 0.28 cm 2 /(V s) are achieved in an organic field‐effect transistor (OFET).