title: Light stability tests of CH3NH3PbI3perovskite solar cells using porous carbon counter electrodes.
abstract: The CH3NH3PbI3perovskite solar cells have been fabricated using three-porous-layered electrodes as, 〈glass/F-doped tin oxide (FTO)/dense TiO2/porous TiO2-perovskite/porous ZrO2-perovskite/porous carbon-perovskite〉 for light stability tests. Without encapsulation in air, the CH3NH3PbI3perovskite solar cells maintained 80% of photoenergy conversion efficiency from the initial value up to 100 h under light irradiation (AM 1.5, 100 mW cm-2). Considering the color variation of the CH3NH3PbI3perovskite layer, the significant improvement of light stability is due to the moisture-blocking effect of the porous carbon back electrodes. The strong interaction between carbon and CH3NH3PbI3perovskite was proposed by the measurements of X-ray photoelectron spectroscopy and X-ray diffraction of the porous carbon-perovskite layers.
authors.affiliation: Department of Materials and Synchrotron Radiation Engineering, Graduate School of Engineering, University of Hyogo, 2167 Shosha, Himeji, Hyogo 671-2201, Japan. itou@eng.u-hyogo.ac.jp.
authors.forename: Seigo
authors.initials: S
authors.lastname: Ito
authors.forename: Gai
authors.initials: G
authors.lastname: Mizuta
authors.forename: Shusaku
authors.initials: S
authors.lastname: Kanaya
authors.forename: Hiroyuki
authors.initials: H
authors.lastname: Kanda
authors.forename: Tomoya
authors.initials: T
authors.lastname: Nishina
authors.forename: Seiji
authors.initials: S
authors.lastname: Nakashima
authors.forename: Hironori
authors.initials: H
authors.lastname: Fujisawa
authors.forename: Masaru
authors.initials: M
authors.lastname: Shimizu
authors.forename: Yuichi
authors.initials: Y
authors.lastname: Haruyama
authors.forename: Hitoshi
authors.initials: H
authors.lastname: Nishino