title: Benzotrithiophene-Based Hole-Transporting Materials for 18.2 % Perovskite Solar Cells.
abstract: New star-shaped benzotrithiophene (BTT)-based hole-transporting materials (HTM) BTT-1, BTT-2 and BTT-3 have been obtained through a facile synthetic route by crosslinking triarylamine-based donor groups with a benzotrithiophene (BTT) core. The BTT HTMs were tested on solution-processed lead trihalide perovskite-based solar cells. Power conversion efficiencies in the range of 16 % to 18.2 % were achieved under AM 1.5 sun with the three derivatives. These values are comparable to those obtained with today's most commonly used HTM spiro-OMeTAD, which point them out as promising candidates to be used as readily available and cost-effective alternatives in perovskite solar cells (PSCs).
authors.affiliation: IMDEA-Nanociencia, C/ Faraday 9, Ciudad, Universitaria de Cantoblanco, 28049, Madrid, Spain.
authors.forename: Agustín
authors.initials: A
authors.lastname: Molina-Ontoria
authors.affiliation: Group for Molecular Engineering of Functional Materials, Institute of Chemical Sciences and Engineering, EPFL VALAIS, 1951, Sion, Switzerland.
authors.forename: Iwan
authors.initials: I
authors.lastname: Zimmermann
authors.affiliation: IMDEA-Nanociencia, C/ Faraday 9, Ciudad, Universitaria de Cantoblanco, 28049, Madrid, Spain.
authors.forename: Inés
authors.initials: I
authors.lastname: Garcia-Benito
authors.affiliation: Group for Molecular Engineering of Functional Materials, Institute of Chemical Sciences and Engineering, EPFL VALAIS, 1951, Sion, Switzerland.
authors.forename: Paul
authors.initials: P
authors.lastname: Gratia
authors.affiliation: Group for Molecular Engineering of Functional Materials, Institute of Chemical Sciences and Engineering, EPFL VALAIS, 1951, Sion, Switzerland.
authors.forename: Cristina
authors.initials: C
authors.lastname: Roldán-Carmona
authors.affiliation: Group for Molecular Engineering of Functional Materials, Institute of Chemical Sciences and Engineering, EPFL VALAIS, 1951, Sion, Switzerland.
authors.forename: Sadig
authors.initials: S
authors.lastname: Aghazada
authors.affiliation: Laboratory of Photonics and Interfaces, Institute of Chemical Sciences and Engineering, EPFL VALAIS, 1015, Lausanne, Switzerland.
authors.forename: Michael
authors.initials: M
authors.lastname: Graetzel
authors.affiliation: Group for Molecular Engineering of Functional Materials, Institute of Chemical Sciences and Engineering, EPFL VALAIS, 1951, Sion, Switzerland. mdkhaja.nazeeruddin@epfl.ch.
authors.forename: Mohammad Khaja
authors.initials: MK
authors.lastname: Nazeeruddin
authors.affiliation: IMDEA-Nanociencia, C/ Faraday 9, Ciudad, Universitaria de Cantoblanco, 28049, Madrid, Spain. nazmar@ucm.es.|Departamento Química Orgánica, Facultad C. C. Químicas, Universidad Complutense de Madrid, Av. Complutense s/n, 28040, Madrid, Spain. nazmar@ucm.es.
authors.forename: Nazario
authors.initials: N
authors.lastname: Martín
keywords: benzotrithiophenes; perovskites; power conversion efficiency; solar cells; triarylamines