title: High-Efficiency Perovskite Solar Cells Employing a S,N-Heteropentacene-based D-A Hole-Transport Material.
abstract: We developed a new donor-π-acceptor-type hole-transport material (HTMs) incorporating S,N-heteropentacene as π-spacer, triarylamine as donor, and dicyanovinylene as acceptor. In addition to appropriate frontier molecular orbital energies, the new HTM showed high photo absorptivity in the visible region. Without the use of p-dopants, solution-processed mixed perovskite devices using the HTM achieved power conversion efficiencies of up to 16.9% and high photocurrents of up to 22.2 mA cm(-2). These results demonstrate that heteroacene can be an excellent building block to prepare alternative HTMs for perovskite solar cells and hold promise for further advancement through fine-tuning the molecular structure.
authors.affiliation: Laboratory for Photomolecular Science, Institute of Chemical Sciences and Engineering, École Polytechnique Fédérale de Lausanne, 1015-, Lausanne, Switzerland.
authors.forename: Dongqin
authors.initials: D
authors.lastname: Bi
authors.affiliation: Institute of Organic Chemistry II and Advanced Materials, University of Ulm, Albert-Einstein-Allee 11, 89081, Ulm, Germany. amaresh.mishra@uni-ulm.de.
authors.forename: Amaresh
authors.initials: A
authors.lastname: Mishra
authors.affiliation: Group for Molecular Engineering of Functional Materials, École Polytechnique Fédérale de Lausanne (EPFL), Valais Wallis rue de l'Industrie 17, Sion, 1951, Switzerland.
authors.forename: Peng
authors.initials: P
authors.lastname: Gao
authors.affiliation: Laboratory of Photonics and Interfaces, Institute of Chemical Sciences and Engineering, École Polytechnique Fédérale de Lausanne (EPFL), Station 6, 1015, Lausanne, Switzerland.|Center for Physical Sciences and Technology, Savanorių Ave. 231, 02300, Vilnius, Lithuania.
authors.forename: Marius
authors.initials: M
authors.lastname: Franckevičius
authors.affiliation: Institute of Organic Chemistry II and Advanced Materials, University of Ulm, Albert-Einstein-Allee 11, 89081, Ulm, Germany.
authors.forename: Christopher
authors.initials: C
authors.lastname: Steck
authors.affiliation: Laboratory of Photonics and Interfaces, Institute of Chemical Sciences and Engineering, École Polytechnique Fédérale de Lausanne (EPFL), Station 6, 1015, Lausanne, Switzerland.
authors.forename: Shaik Mohammed
authors.initials: SM
authors.lastname: Zakeeruddin
authors.affiliation: Group for Molecular Engineering of Functional Materials, École Polytechnique Fédérale de Lausanne (EPFL), Valais Wallis rue de l'Industrie 17, Sion, 1951, Switzerland.
authors.forename: Mohammad Khaja
authors.initials: MK
authors.lastname: Nazeeruddin
authors.affiliation: Institute of Organic Chemistry II and Advanced Materials, University of Ulm, Albert-Einstein-Allee 11, 89081, Ulm, Germany.
authors.forename: Peter
authors.initials: P
authors.lastname: Bäuerle
authors.affiliation: Laboratory of Photonics and Interfaces, Institute of Chemical Sciences and Engineering, École Polytechnique Fédérale de Lausanne (EPFL), Station 6, 1015, Lausanne, Switzerland.
authors.forename: Michael
authors.initials: M
authors.lastname: Grätzel
authors.affiliation: Laboratory for Photomolecular Science, Institute of Chemical Sciences and Engineering, École Polytechnique Fédérale de Lausanne, 1015-, Lausanne, Switzerland. anders.hagfeldt@epfl.ch.
authors.forename: Anders
authors.initials: A
authors.lastname: Hagfeldt
mesh_terms: D017610:Calcium Compounds / Q000737:chemistry*; D008855:Microscopy, Electron, Scanning; D009279:Naphthacenes / Q000737:chemistry*; D010087:Oxides / Q000737:chemistry*; D012993:Solar Energy; D014025:Titanium / Q000737:chemistry*
chemical_list: D017610:Calcium Compounds; D009279:Naphthacenes; D010087:Oxides; C059910:perovskite; C523499:pentacene; D014025:Titanium
keywords: heteroacene; hole-transport material; perovskite; solar cell; spectroscopy