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The Role of the Axial Substituent in Subphthalocyanine Acceptors for Bulk‐Heterojunction Solar Cells
Author(s) -
Duan Chunhui,
Zango Germán,
García Iglesias Miguel,
Colberts Fallon J. M.,
Wienk Martijn M.,
MartínezDíaz M. Victoria,
Janssen René A. J.,
Torres Tomás
Publication year - 2017
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.201608644
Subject(s) - photocurrent , electron acceptor , organic solar cell , photochemistry , electron donor , acceptor , heterojunction , polymer solar cell , materials science , energy conversion efficiency , electron , substituent , optoelectronics , absorption (acoustics) , chemistry , organic chemistry , physics , condensed matter physics , composite material , quantum mechanics , catalysis , polymer
Four hexachlorosubphthalocyanines SubPcCl 6 ‐X bearing different axial substituents (X) have been synthesized for use as novel electron acceptors in solution‐processed bulk‐heterojunction organic solar cells. Subphthalocyanines are aromatic chromophoric molecules with cone‐shaped structure, good solution processability, intense optical absorption in the visible spectral region, appropriate electron mobilities, and tunable energy levels. Solar cells with subphthalocyanines as the electron acceptor and PTB7‐Th as the electron donor exhibit a power conversion efficiency up to 4 % and an external quantum efficiency approaching 60 % due to significant contributions from both the electron donor and the electron acceptor to the photocurrent, indicating a promising prospect of non‐fullerene acceptors based on subphthalocyanines and structurally related systems.