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Issue 44, 2020
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Tailoring the side chain of imide-functional benzotriazole based polymers to achieve internal quantum efficiency approaching 100%

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Abstract

The development 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 combined with a non-fullerene acceptor Y6, both copolymers presented increased crystalline coherence length and significantly reduced phase-separated domain size, thus resulting in 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 the PClT-EHp:Y6 blend presents a remarkable current density of 27.3 mA cm−2 and an impressively high internal quantum efficiency approaching 100% at the wavelength of 820 nm, both of which are among the highest values reported for single-junction organic solar cells. Moreover, the devices prepared from PClT-EHp and the Y6-derivative, Y6DT, present a further enhanced efficiency of 16.4%, demonstrating the efficacy of delicate materials design toward high-performance binary organic solar cells.

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

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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, 2020,8, 23519-23525
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, 8, 23519
DOI: 10.1039/D0TA08725D

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