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Rational Design of Donor–Acceptor Based Semiconducting Copolymers with High Dielectric Constants
Aiswarya Abhisek Mohapatra,
Yifan Dong,
Puttaraju Boregowda,
Ashutosh Mohanty,
Aditya Sadhanala,
Xuechen Jiao,
Awadhesh Narayan,
Christopher R. McNeill,
James Durrant 
The Journal of Physical Chemistry C, Volume: 125, Issue: 12, Pages: 6886 - 6896
Swansea University Author:
James Durrant
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DOI (Published version): 10.1021/acs.jpcc.1c00340
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 (...
| Published in: | The Journal of Physical Chemistry C |
|---|---|
| ISSN: | 1932-7447 1932-7455 |
| Published: |
American Chemical Society (ACS)
2021
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| Online Access: |
Check full text
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| URI: | https://cronfa.swan.ac.uk/Record/cronfa56837 |
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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. |
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| Keywords: |
Dielectric constant, triethyleneglycol sidechains, diketopyrrolopyrrole, Naphthalene diimide |
| College: |
Faculty of Science and Engineering |
| Issue: |
12 |
| Start Page: |
6886 |
| End Page: |
6896 |