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Rational Design of Donor-Acceptor Based Semiconducting Copolymers with High Dielectric Constants

Mohapatra, AA and Dong, Y and Boregowda, P and Mohanty, A and Sadhanala, A and Jiao, X and Narayan, A and McNeill, CR and Durrant, JR and Patil, S (2021) Rational Design of Donor-Acceptor Based Semiconducting Copolymers with High Dielectric Constants. In: Journal of Physical Chemistry C, 125 (12). pp. 6886-6896.

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Official URL: https://doi.org/10.1021/acs.jpcc.1c00340


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. © 2021 American Chemical Society.

Item Type: Journal Article
Publication: Journal of Physical Chemistry C
Publisher: American Chemical Society
Additional Information: The copyright for this article belongs to Authors
Keywords: Absorption spectroscopy; Conjugated polymers; Naphthalene; Organic solar cells; Spectroscopic analysis, Coulombic interactions; Diketopyrrolopyrroles; Exciton diffusion length; High dielectric constants; Low dielectric constants; Organic semiconducting polymers; Semiconducting copolymers; Spectroscopic studies, Semiconducting polymers
Department/Centre: Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Division of Interdisciplinary Sciences > Centre for Nano Science and Engineering
Date Deposited: 19 Jul 2021 10:57
Last Modified: 19 Jul 2021 10:57
URI: http://eprints.iisc.ac.in/id/eprint/68895

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