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

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...

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Published inJournal of physical chemistry. C Vol. 125; no. 12; pp. 6886 - 6896
Main Authors Mohapatra, Aiswarya Abhisek, Dong, Yifan, Boregowda, Puttaraju, Mohanty, Ashutosh, Sadhanala, Aditya, Jiao, Xuechen, Narayan, Awadhesh, McNeill, Christopher R, Durrant, James R, Patil, Satish
Format Journal Article
LanguageEnglish
Published American Chemical Society 01.04.2021
Subjects
absorption
C: Physical Properties of Materials and Interfaces
composite polymers
dielectric properties
naphthalene
semiconductors
spectroscopy
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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.
AbstractList 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.
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.
Author Mohanty, Ashutosh
McNeill, Christopher R
Durrant, James R
Dong, Yifan
Mohapatra, Aiswarya Abhisek
Patil, Satish
Jiao, Xuechen
Narayan, Awadhesh
Sadhanala, Aditya
Boregowda, Puttaraju
AuthorAffiliation Centre for Nano Science and Engineering
Department of Chemistry and Centre for Processable Electronics
Optoelectronics Group
Swansea University
Cavendish Laboratory
Solid State and Structural Chemistry Unit
SPECIFIC, College of Engineering
Indian Institute of Science
Department of Materials Science and Engineering
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Snippet The low dielectric constant of organic semiconductors limits the efficiency of organic solar cells (OSCs). In an attempt to improve the dielectric constant of...
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SubjectTerms absorption
C: Physical Properties of Materials and Interfaces
composite polymers
dielectric properties
naphthalene
semiconductors
spectroscopy
Title Rational Design of Donor–Acceptor Based Semiconducting Copolymers with High Dielectric Constants
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