title: ZrO2/TiO2Electron Collection Layer for Efficient Meso-Superstructured Hybrid Perovskite Solar Cells.
abstract: Since the first reports of efficient organic-inorganic perovskite solar cells in 2012, an explosion of research activity has emerged around the world, which has led to a rise in the power conversion efficiencies (PCEs) to over 20%. Despite the impressive efficiency, a key area of the device which remains suboptimal is the electron extraction layer and its interface with the photoactive perovskite. Here, we implement an electron collection "bilayer" composed of a thin layer of zirconia coated with titania, sitting upon the transparent conductive oxide fluorine-doped tin oxide (FTO). With this double collection layer we have reached up to 17.9% power conversion efficiency, delivering a stabilized power output (SPO) of 17.0%, measured under simulated AM 1.5 sunlight of 100 mW cm-2irradiance. Finally, we propose a mechanism of the charge transfer processes within the fabricated architectures in order to explain the obtained performance of the devices.
authors.affiliation: Centro de Investigación, Innovación y Desarrollo de Materiales - CIDEMAT, Universidad de Antioquia UdeA , Calle 70 No 52-21, Medellin 050010, Colombia.
authors.forename: Mario Alejandro
authors.identifier: http://orcid.org/0000-0001-7093-7964
authors.initials: MA
authors.lastname: Mejía Escobar
authors.affiliation: Clarendon Laboratory, Department of Physics, University of Oxford , Parks Road, Oxford OX1 3PU, United Kingdom.
authors.forename: Sandeep
authors.initials: S
authors.lastname: Pathak
authors.affiliation: Clarendon Laboratory, Department of Physics, University of Oxford , Parks Road, Oxford OX1 3PU, United Kingdom.
authors.forename: Jiewei
authors.initials: J
authors.lastname: Liu
authors.affiliation: Clarendon Laboratory, Department of Physics, University of Oxford , Parks Road, Oxford OX1 3PU, United Kingdom.
authors.forename: Henry J
authors.initials: HJ
authors.lastname: Snaith
authors.affiliation: Centro de Investigación, Innovación y Desarrollo de Materiales - CIDEMAT, Universidad de Antioquia UdeA , Calle 70 No 52-21, Medellin 050010, Colombia.
authors.forename: Franklin
authors.identifier: http://orcid.org/0000-0003-1722-5487
authors.initials: F
authors.lastname: Jaramillo
keywords: anomalous hysteresis; atomic force microscopy; electron collection layer; perovskite solar cell; pinholes