title: Improving efficiency and stability of perovskite solar cells with photocurable fluoropolymers.
abstract: Organometal halide perovskite solar cells have demonstrated high conversion efficiency but poor long-term stability against ultraviolet irradiation and water. We show that rapid light-induced free-radical polymerization at ambient temperature produces multifunctional fluorinated photopolymer coatings that confer luminescent and easy-cleaning features on the front side of the devices, while concurrently forming a strongly hydrophobic barrier toward environmental moisture on the back contact side. The luminescent photopolymers re-emit ultraviolet light in the visible range, boosting perovskite solar cells efficiency to nearly 19% under standard illumination. Coated devices reproducibly retain their full functional performance during prolonged operation, even after a series of severe aging tests carried out for more than 6 months.
authors.affiliation: Group for Applied Materials and Electrochemistry (GAME Lab), CHENERGY Group, Department of Applied Science and Technology (DISAT), Politecnico di Torino, Corso Duca degli Abruzzi 24, 10129, Torino, Italy. federico.bella@polito.it gianmarco.griffini@polimi.it anders.hagfeldt@epfl.ch.
authors.forename: Federico
authors.initials: F
authors.lastname: Bella
authors.affiliation: Department of Chemistry, Materials and Chemical Engineering "Giulio Natta," Politecnico di Milano, Piazza Leonardo da Vinci 32, 20133, Milano, Italy. federico.bella@polito.it gianmarco.griffini@polimi.it anders.hagfeldt@epfl.ch.
authors.forename: Gianmarco
authors.initials: G
authors.lastname: Griffini
authors.affiliation: Laboratory of Photomolecular Science, Institute of Chemical Sciences and Engineering, Ecole Polytechnique Fédérale de Lausanne (EPFL), Chemin des Alambics, Station 3, 1015, Lausanne, Switzerland.
authors.forename: Juan-Pablo
authors.initials: JP
authors.lastname: Correa-Baena
authors.affiliation: Center for Sustainable Futures @PoliTO, Istituto Italiano di Tecnologia, Corso Trento 21, 10129, Torino, Italy.
authors.forename: Guido
authors.initials: G
authors.lastname: Saracco
authors.affiliation: Laboratory of Photonics and Interfaces, Institut des Sciences et Ingénierie Chimiques, Ecole Polytechnique Fédérale de Lausanne (EPFL), Station 3, 1015, Lausanne, Switzerland.
authors.forename: Michael
authors.initials: M
authors.lastname: Grätzel
authors.affiliation: Laboratory of Photomolecular Science, Institute of Chemical Sciences and Engineering, Ecole Polytechnique Fédérale de Lausanne (EPFL), Chemin des Alambics, Station 3, 1015, Lausanne, Switzerland. federico.bella@polito.it gianmarco.griffini@polimi.it anders.hagfeldt@epfl.ch.
authors.forename: Anders
authors.initials: A
authors.lastname: Hagfeldt
authors.affiliation: Department of Chemistry, Materials and Chemical Engineering "Giulio Natta," Politecnico di Milano, Piazza Leonardo da Vinci 32, 20133, Milano, Italy.
authors.forename: Stefano
authors.initials: S
authors.lastname: Turri
authors.affiliation: Group for Applied Materials and Electrochemistry (GAME Lab), CHENERGY Group, Department of Applied Science and Technology (DISAT), Politecnico di Torino, Corso Duca degli Abruzzi 24, 10129, Torino, Italy.
authors.forename: Claudio
authors.initials: C
authors.lastname: Gerbaldi