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Tailoring the side chain of imide-functional benzotriazole based polymers to achieve internal quantum efficiency approaching 100%

Abstract

The rise of halogenated organic semiconducting materials has triggered a significant enhancement in power conversion efficiency of organic solar cells. Herein, two wide-bandgap polymers containing an electron-deficient [1,2,3]triazolo[4,5-f]isoindole-5,7(2H,6H)-dione (TzBI) unit were developed, by introducing a halogen atom into the thienyl side chain of the copolymerized benzo[1,2-b:4,5-b′]dithiophene unit. When combining with a non-fullerene acceptor Y6, both copolymers presented increased crystalline coherence length and significantly reduced phase-separated domain size, and thus resulting higher charge transfer efficiency and more satisfactory charge transport properties than the non-halogenated polymer analogue PHT-EHp without halogen substituents in the thienyl unit of the side-chain. The organic solar cell device based on PClT-EHp:Y6 blend present a remarkable current density of 27.3 mA cm−2 and an impressively high internal quantum efficiency of approaching 100% at the wavelength of 820 nm, both of which are among the highest values reported for single-junction organic solar cells. Moreover, devices prepared from PClT-EHp and the Y6-derivative, Y6DT produces a further enhanced efficiency of 16.4%, demonstrating the efficacy of dedicate materials design toward high-performance binary organic solar cells.

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Supplementary files

Article information


Submitted
04 Sep 2020
Accepted
13 Oct 2020
First published
14 Oct 2020

J. Mater. Chem. A, 2020, Accepted Manuscript
Article type
Paper

Tailoring the side chain of imide-functional benzotriazole based polymers to achieve internal quantum efficiency approaching 100%

M. Li, Z. Zeng, B. Fan, W. Zhong, D. Zhang, X. Zhang, Y. Zhang, L. Ying, F. Huang and Y. Cao, J. Mater. Chem. A, 2020, Accepted Manuscript , DOI: 10.1039/D0TA08725D

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