title: Stark effect in perovskite/TiO2 solar cells: evidence of local interfacial order.
abstract: To unveil the mechanisms controlling photovoltaic conversion in high-performing perovskite-based mesostructured solar cells, we focus on the key role played by the mesoporous oxide/perovskite interface. We employ several spectroscopic techniques to design a complete scenario and corroborate our results with first principle density functional theory calculations. In particular Stark spectroscopy, a powerful tool allowing interface-sensitive analysis is employed to prove the existence of oriented permanent dipoles, consistent with the hypothesis of an ordered perovskite layer, close to the oxide surface. The existence of a structural order, promoted by specific local interactions, could be one of the decisive reasons for highly efficient carriers transport within perovskite films.
authors.affiliation: Center for Bio-Molecular Nanotechnology, Fondazione Istituto Italiano di Tecnologia , Via Barsanti, 73010 Arnesano (Lecce), Italy.
authors.forename: Vittoria
authors.initials: V
authors.lastname: Roiati
authors.forename: Edoardo
authors.initials: E
authors.lastname: Mosconi
authors.forename: Andrea
authors.initials: A
authors.lastname: Listorti
authors.forename: Silvia
authors.initials: S
authors.lastname: Colella
authors.forename: Giuseppe
authors.initials: G
authors.lastname: Gigli
authors.forename: Filippo
authors.initials: F
authors.lastname: De Angelis