title: Room-Temperature Atomic Layer Deposition of Al2O3: Impact on Efficiency, Stability and Surface Properties in Perovskite Solar Cells.
abstract: In this work, solar cells with a freshly made CH3NH3PbI3perovskite film showed a power conversion efficiency (PCE) of 15.4 % whereas the one with 50 days aged perovskite film only 6.1 %. However, when the aged perovskite was covered with a layer of Al2O3deposited by atomic layer deposition (ALD) at room temperature (RT), the PCE value was clearly enhanced. X-ray photoelectron spectroscopy study showed that the ALD precursors are chemically active only at the perovskite surface and passivate it. Moreover, the RT-ALD-Al2O3-covered perovskite films showed enhanced ambient air stability.
authors.affiliation: Applied Physics and Sensors, Brandenburg University of Technology Cottbus-Senftenberg, Konrad-Wachsmann-Allee 17, 03046, Cottbus, Germany.
authors.forename: Malgorzata
authors.identifier: http://orcid.org/0000-0001-7170-4513
authors.initials: M
authors.lastname: Kot
authors.affiliation: Applied Physics and Sensors, Brandenburg University of Technology Cottbus-Senftenberg, Konrad-Wachsmann-Allee 17, 03046, Cottbus, Germany.
authors.forename: Chittaranjan
authors.initials: C
authors.lastname: Das
authors.affiliation: Clarendon Laboratory, University of Oxford, Parks Road, Oxford, OX13PU, United Kingdom.
authors.forename: Zhiping
authors.initials: Z
authors.lastname: Wang
authors.affiliation: Applied Physics and Sensors, Brandenburg University of Technology Cottbus-Senftenberg, Konrad-Wachsmann-Allee 17, 03046, Cottbus, Germany.
authors.forename: Karsten
authors.initials: K
authors.lastname: Henkel
authors.affiliation: Applied Physics and Sensors, Brandenburg University of Technology Cottbus-Senftenberg, Konrad-Wachsmann-Allee 17, 03046, Cottbus, Germany.
authors.forename: Zied
authors.initials: Z
authors.lastname: Rouissi
authors.affiliation: Clarendon Laboratory, University of Oxford, Parks Road, Oxford, OX13PU, United Kingdom.
authors.forename: Konrad
authors.initials: K
authors.lastname: Wojciechowski
authors.affiliation: Clarendon Laboratory, University of Oxford, Parks Road, Oxford, OX13PU, United Kingdom.
authors.forename: Henry J
authors.initials: HJ
authors.lastname: Snaith
authors.affiliation: Applied Physics and Sensors, Brandenburg University of Technology Cottbus-Senftenberg, Konrad-Wachsmann-Allee 17, 03046, Cottbus, Germany.
authors.forename: Dieter
authors.initials: D
authors.lastname: Schmeisser
mesh_terms: D000537:Aluminum Oxide / Q000737:chemistry*; D017610:Calcium Compounds / Q000737:chemistry*; D011211:Electric Power Supplies; D010087:Oxides / Q000737:chemistry*; D012993:Solar Energy; D013499:Surface Properties; D013696:Temperature; D014025:Titanium / Q000737:chemistry*
chemical_list: D017610:Calcium Compounds; D010087:Oxides; C059910:perovskite; D014025:Titanium; D000537:Aluminum Oxide
keywords: ALD; Al2O3; XPS; perovskite; solar cells