title: Carbon-double-bond-free printed solar cells from TiO₂/CH₃NH₃PbI₃/CuSCN/Au: structural control and photoaging effects.
abstract: Carbon double bond-free printed solar cells have been fabricated with the structure <F-doped SnO2 (FTO)/dense TiO2/nanocrystalline TiO2/CH3NH3PbI3/Au> and <FTO/dense TiO2/nanocrystalline TiO2/CH3NH3PbI3/CuSCN/Au>, in which CuSCN acts as a hole conductor. The thickness of the CH3NH3PbI3 layer is controlled by a hot air flow during spin coating. The best conversion efficiency (4.86%) is obtained with <FTO/dense TiO2/nanocrystalline TiO2/thin CH3NH3PbI3 (hot-air dried)/CuSCN/Au>. However, a thick CH3NH3PbI3 layer on CuSCN is better for light-exposure stability (100 mW cm(-2) AM 1.5) when not encapsulated. Without the CuSCN coverage, the black CH3NH3PbI3 crystal changes to yellow during the light-exposure stability test, which is due to the transformation of the CH3NH3PbI3 perovskite crystal into hexagonal PbI2.
authors.affiliation: Department of Electric Engineering and Computer Science, Graduate School of Engineering, University of Hyogo, 2167 Shosha, Himeji, Hyogo 671-2280 (Japan), Fax: (+81) 79-267-4858. itou@eng.u-hyogo.ac.jp.
authors.forename: Seigo
authors.initials: S
authors.lastname: Ito
authors.forename: Soichiro
authors.initials: S
authors.lastname: Tanaka
authors.forename: Henri
authors.initials: H
authors.lastname: Vahlman
authors.forename: Hitoshi
authors.initials: H
authors.lastname: Nishino
authors.forename: Kyohei
authors.initials: K
authors.lastname: Manabe
authors.forename: Peter
authors.initials: P
authors.lastname: Lund
keywords: energy conversion; hole transport; perovskite phases; solar cells; structure control