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Miscibility‐Controlled Phase Separation in Double‐Cable Conjugated Polymers for Single‐Component Organic Solar Cells with Efficiencies over 8 %
Author(s) -
Jiang Xudong,
Yang Jinjin,
Karuthedath Safakath,
Li Junyu,
Lai Wenbin,
Li Cheng,
Xiao Chengyi,
Ye Long,
Ma Zaifei,
Tang Zheng,
Laquai Frédéric,
Li Weiwei
Publication year - 2020
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.202009272
Subject(s) - conjugated system , miscibility , materials science , polymer , side chain , organic solar cell , phase (matter) , polymer solar cell , chemical physics , chemical engineering , polymer chemistry , photochemistry , optoelectronics , organic chemistry , chemistry , composite material , engineering
A record power conversion efficiency of 8.40 % was obtained in single‐component organic solar cells (SCOSCs) based on double‐cable conjugated polymers. This is realized based on exciton separation playing the same role as charge transport in SCOSCs. Two double‐cable conjugated polymers were designed with almost identical conjugated backbones and electron‐withdrawing side units, but extra Cl atoms had different positions on the conjugated backbones. When Cl atoms were positioned at the main chains, the polymer formed the twist backbones, enabling better miscibility with the naphthalene diimide side units. This improves the interface contact between conjugated backbones and side units, resulting in efficient conversion of excitons into free charges. These findings reveal the importance of charge generation process in SCOSCs and suggest a strategy to improve this process: controlling miscibility between conjugated backbones and aromatic side units in double‐cable conjugated polymers.