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Issue 14, 2020
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Transannularly conjugated tetrameric perylene diimide acceptors containing [2.2]paracyclophane for non-fullerene organic solar cells

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Abstract

Core engineering of perylene diimide (PDI)-based small molecular acceptors has played a critical role in boosting the device performances in the field of organic solar cells (OSCs). In this work, two regio-isomeric PDI-based acceptors (named oCP-FPDI4 and pCP-FPDI4) based on a novel [2.2]paracyclophane core were designed and synthesized. Due to the subtle variations in the functionalization positions on the [2.2]paracyclophane moiety, the two PDI acceptors exhibit different molecular geometries and absorption properties. When blended with a donor polymer named P3TEA, oCP-FPDI4 and pCP-FPDI4 showed dramatic differences in photovoltaic performances (2.42% vs. 9.06%). In-depth studies on the nano-scale morphology of the respective blend films revealed that the P3TEA:pCP-FPDI4 blend exhibited suitable phase segregation, thus contributing to better charge dissociation and less charge recombination. The marked variations in photovoltaic performances between oCP-FPDI4 and pCP-FPDI4 highlight the importance of regulating the spatial orientations in the design of PDI-based acceptors using cyclophane derivatives.

Graphical abstract: Transannularly conjugated tetrameric perylene diimide acceptors containing [2.2]paracyclophane for non-fullerene organic solar cells

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Supplementary files

Article information


Submitted
02 Jan 2020
Accepted
02 Mar 2020
First published
02 Mar 2020

J. Mater. Chem. A, 2020,8, 6501-6509
Article type
Communication

Transannularly conjugated tetrameric perylene diimide acceptors containing [2.2]paracyclophane for non-fullerene organic solar cells

H. Yu, L. Arunagiri, L. Zhang, J. Huang, W. Ma, J. Zhang and H. Yan, J. Mater. Chem. A, 2020, 8, 6501
DOI: 10.1039/D0TA00047G

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