title: The Role of the Axial Substituent in Subphthalocyanine Acceptors for Bulk-Heterojunction Solar Cells.
abstract: Four hexachlorosubphthalocyanines SubPcCl6-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.
authors.affiliation: Molecular Materials and Nanosystems, Institute for Complex Molecular Systems, Eindhoven University of Technology, P. O. Box 513, 5600 MB, Eindhoven, The Netherlands.
authors.forename: Chunhui
authors.initials: C
authors.lastname: Duan
authors.affiliation: Department of Organic Chemistry, Universidad Autónoma de Madrid, c/Francisco TomásyValiente 7, Cantoblanco, 28049 Madrid, Spain.
authors.forename: Germán
authors.initials: G
authors.lastname: Zango
authors.affiliation: Department of Organic Chemistry, Universidad Autónoma de Madrid, c/Francisco TomásyValiente 7, Cantoblanco, 28049 Madrid, Spain.|IMDEA-Nanociencia, c/Faraday 9, Campus de Cantoblanco, 28049, Madrid, Spain.
authors.forename: Miguel
authors.initials: M
authors.lastname: García Iglesias
authors.affiliation: Molecular Materials and Nanosystems, Institute for Complex Molecular Systems, Eindhoven University of Technology, P. O. Box 513, 5600 MB, Eindhoven, The Netherlands.
authors.forename: Fallon J M
authors.initials: FJ
authors.lastname: Colberts
authors.affiliation: Molecular Materials and Nanosystems, Institute for Complex Molecular Systems, Eindhoven University of Technology, P. O. Box 513, 5600 MB, Eindhoven, The Netherlands.|Dutch Institute for Fundamental Energy Research, De Zaale 20, 5612 AJ, Eindhoven, The Netherlands.
authors.forename: Martijn M
authors.initials: MM
authors.lastname: Wienk
authors.affiliation: Department of Organic Chemistry, Universidad Autónoma de Madrid, c/Francisco TomásyValiente 7, Cantoblanco, 28049 Madrid, Spain.
authors.forename: M Victoria
authors.initials: MV
authors.lastname: Martínez-Díaz
authors.affiliation: Molecular Materials and Nanosystems, Institute for Complex Molecular Systems, Eindhoven University of Technology, P. O. Box 513, 5600 MB, Eindhoven, The Netherlands.|Dutch Institute for Fundamental Energy Research, De Zaale 20, 5612 AJ, Eindhoven, The Netherlands.
authors.forename: René A J
authors.initials: RA
authors.lastname: Janssen
authors.affiliation: Department of Organic Chemistry, Universidad Autónoma de Madrid, c/Francisco TomásyValiente 7, Cantoblanco, 28049 Madrid, Spain.|IMDEA-Nanociencia, c/Faraday 9, Campus de Cantoblanco, 28049, Madrid, Spain.
authors.forename: Tomás
authors.initials: T
authors.lastname: Torres
keywords: bulk heterojunctions; electron acceptors; solar cells; subphthalocyanines; substitution effects