Fluorine-induced self-doping and spatial conformation in alcohol-soluble interlayers for highly-efficient polymer solar cells

The molecular design strategy for high-performance photoelectric materials emphasizes the intrinsic charge transfer/transport as well as the role of the polymer chemical structure and chain conformation. Here, we report a new interface engineering strategy for non-fullerene polymer solar cells (PSCs...

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Bibliographic Details
Published in:Journal of materials chemistry. A, Materials for energy and sustainability Materials for energy and sustainability, 2018, Vol.6 (2), p.423-433
Main Authors: Jin, Xiufen, Wang, Yilin, Cheng, Xiaofang, Zhou, Huanyu, Hu, Lin, Zhou, Yinhua, Chen, Lie, Chen, Yiwang
Format: Article
Language:English
Subjects:
Alcohols
Charge transfer
Charge transport
Conformation
Doping
Energy conversion efficiency
Fluorination
Fluorine
Interlayers
Molecular conformation
Photoelectric materials
Photoelectricity
Photovoltaic cells
Polyelectrolytes
Polymers
Solar cells
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Summary:The molecular design strategy for high-performance photoelectric materials emphasizes the intrinsic charge transfer/transport as well as the role of the polymer chemical structure and chain conformation. Here, we report a new interface engineering strategy for non-fullerene polymer solar cells (PSCs) by employing highly conductive polyelectrolyte interface layers with a fluorinated conjugated backbone. The fluorine atom-induced strong n-type self-doping effect and optimized expanded conformation were observed to substantially improve their intrinsic charge mobility. An outstanding power conversion efficiency of 11.51% was obtained when applying the new polyelectrolyte interlayer in PSCs based on a PBDB-T:ITIC active layer.
ISSN:2050-7488
2050-7496
DOI:10.1039/C7TA08669E