The Role of the Axial Substituent in Subphthalocyanine Acceptors for Bulk-Heterojunction Solar Cells.

Authors :: Duan C
Zango G
García Iglesias M
Colberts FJ
Wienk MM
Martínez-Díaz MV
Janssen RA
Torres T
Source :: Angewandte Chemie (International ed. in English) [Angew Chem Int Ed Engl] 2017 Jan 02; Vol. 56 (1), pp. 148-152. Date of Electronic Publication: 2016 Nov 28.
Publication Year :: 2017
Abstract: Four hexachlorosubphthalocyanines SubPcCl <subscript>6</subscript> -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.<br /> (© 2016 The Authors. Published by Wiley-VCH Verlag GmbH & Co. KGaA.)

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