Rational Design of Donor–Acceptor Based Semiconducting Copolymers with High Dielectric Constants
- Aiswarya Abhisek MohapatraAiswarya Abhisek MohapatraSolid State and Structural Chemistry Unit, Indian Institute of Science, Bangalore 560012, IndiaMore by Aiswarya Abhisek Mohapatra
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- Yifan DongYifan DongDepartment of Chemistry and Centre for Processable Electronics, Imperial College London, London, U.K.More by Yifan Dong
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- Puttaraju BoregowdaPuttaraju BoregowdaSolid State and Structural Chemistry Unit, Indian Institute of Science, Bangalore 560012, IndiaMore by Puttaraju Boregowda
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- Ashutosh MohantyAshutosh MohantySolid State and Structural Chemistry Unit, Indian Institute of Science, Bangalore 560012, IndiaMore by Ashutosh Mohanty
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- Aditya SadhanalaAditya SadhanalaOptoelectronics Group, Cavendish Laboratory, JJ Thomson Avenue, Cambridge CB3 0HE, U.K.Centre for Nano Science and Engineering, Indian Institute of Science, Bangalore 560012, IndiaMore by Aditya Sadhanala
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- Xuechen JiaoXuechen JiaoDepartment of Materials Science and Engineering, Monash University, Wellington Road, Clayton, VIC 3800, AustraliaMore by Xuechen Jiao
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- Awadhesh NarayanAwadhesh NarayanSolid State and Structural Chemistry Unit, Indian Institute of Science, Bangalore 560012, IndiaMore by Awadhesh Narayan
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- Christopher R. McNeillChristopher R. McNeillDepartment of Materials Science and Engineering, Monash University, Wellington Road, Clayton, VIC 3800, AustraliaMore by Christopher R. McNeill
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- James R. Durrant*James R. Durrant*Email [email protected]Department of Chemistry and Centre for Processable Electronics, Imperial College London, London, U.K.SPECIFIC, College of Engineering, Swansea University, Swansea SA1 8EN, U.K.More by James R. Durrant
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- Satish Patil*Satish Patil*Email [email protected]Solid State and Structural Chemistry Unit, Indian Institute of Science, Bangalore 560012, IndiaMore by Satish Patil
Abstract
The low dielectric constant of organic semiconductors limits the efficiency of organic solar cells (OSCs). In an attempt to improve the dielectric constant of conjugated polymers, we report the synthesis of three semiconducting copolymers by combining the thiophene-substituted diketopyrrolopyrrole (TDPP) monomer with three different monomeric units with varying electron donating/accepting strengths: benzodithiophene (BBT-3TEG-TDPP), TDPP (TDPP-3TEG-TDPP), and naphthalene diimide (P(gNDI-TDPP)). Among the series, BBT-3TEG-TDPP and P(gNDI-TDPP) exhibited the highest dielectric constants (∼5) at 1 MHz frequency, signifying the contribution of dipolar polarization from TEG side-chains. Furthermore, transient absorption spectroscopic studies performed on these polymers indicated low exciton diffusion length as observed in common organic semiconducting polymers. Our findings suggest that utilizing the polar side-chains enhances the dielectric constant in a frequency regime of megahertz. However, it is not sufficient to reduce the Coulombic interaction between hole and electron in excitonic solar cells.
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