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Rational design of donor-acceptor based semiconducting copolymers with high dielectric constants

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Title: Rational design of donor-acceptor based semiconducting copolymers with high dielectric constants
Authors: Mohapatra, AA
Dong, Y
Boregowda, P
Mohanty, A
Sadhanala, A
Jiao, X
Narayan, A
McNeill, CR
Durrant, JR
Patil, S
Item Type: Journal Article
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.
Issue Date: 1-Apr-2021
Date of Acceptance: 1-Mar-2021
URI: http://hdl.handle.net/10044/1/89745
DOI: 10.1021/acs.jpcc.1c00340
ISSN: 1932-7447
Publisher: American Chemical Society
Start Page: 6886
End Page: 6896
Journal / Book Title: The Journal of Physical Chemistry C: Energy Conversion and Storage, Optical and Electronic Devices, Interfaces, Nanomaterials, and Hard Matter
Volume: 125
Issue: 12
Copyright Statement: © 2021 American Chemical Society. This document is the Accepted Manuscript version of a Published Work that appeared in final form in Journal of Physical Chemistry C, after peer review and technical editing by the publisher. To access the final edited and published work see https://doi.org/10.1021/acs.jpcc.1c00340
Keywords: Science & Technology
Physical Sciences
Technology
Chemistry, Physical
Nanoscience & Nanotechnology
Materials Science, Multidisciplinary
Chemistry
Science & Technology - Other Topics
Materials Science
Science & Technology
Physical Sciences
Technology
Chemistry, Physical
Nanoscience & Nanotechnology
Materials Science, Multidisciplinary
Chemistry
Science & Technology - Other Topics
Materials Science
Physical Chemistry
03 Chemical Sciences
09 Engineering
10 Technology
Publication Status: Published
Online Publication Date: 2021-03-23
Appears in Collections:Chemistry