title: Highly stable perovskite solar cells with an all-carbon hole transport layer.
abstract: Nano-carbon materials (carbon nanotubes, graphene, and graphene oxide) have potential application for photovoltaics because of their excellent optical and electronic properties. Here, we demonstrate that a single-walled carbon nanotubes/graphene oxide buffer layer greatly improves the photovoltaic performance of organo-lead iodide perovskite solar cells. The carbon nanotubes/graphene oxide buffer layer works as an efficient hole transport/electron blocking layer. The photovoltaic conversion efficiency of 13.3% was achieved in the organo-lead iodide perovskite solar cell due to the complementary properties of carbon nanotubes and graphene oxide. Furthermore, the great improvement of photovoltaic performance stability in the perovskite solar cells using carbon nanotubes/graphene oxide/polymethyl methacrylate was demonstrated in comparison with that using a typical organic hole transport layer of 2,2',7,7'-tetrakis-(N,N-di-4-methoxyphenylamino)-9,9'-spirobifluorene.
authors.affiliation: Institute of Advanced Energy, Kyoto University, Uji, Kyoto 611-0011, Japan. matsuda@iae.kyoto-u.ac.jp.
authors.forename: Feijiu
authors.initials: F
authors.lastname: Wang
authors.affiliation: Institute for Chemical Research, Kyoto University, Uji, Kyoto 611-0011, Japan.
authors.forename: Masaru
authors.initials: M
authors.lastname: Endo
authors.affiliation: Institute of Advanced Energy, Kyoto University, Uji, Kyoto 611-0011, Japan. matsuda@iae.kyoto-u.ac.jp.
authors.forename: Shinichiro
authors.initials: S
authors.lastname: Mouri
authors.affiliation: Institute of Advanced Energy, Kyoto University, Uji, Kyoto 611-0011, Japan. matsuda@iae.kyoto-u.ac.jp.
authors.forename: Yuhei
authors.initials: Y
authors.lastname: Miyauchi
authors.affiliation: Institute of Materials and Systems for Sustainability, Nagoya University, Nagoya 464-8603, Japan.
authors.forename: Yutaka
authors.initials: Y
authors.lastname: Ohno
authors.affiliation: Institute for Chemical Research, Kyoto University, Uji, Kyoto 611-0011, Japan.
authors.forename: Atsushi
authors.initials: A
authors.lastname: Wakamiya
authors.affiliation: Institute for Chemical Research, Kyoto University, Uji, Kyoto 611-0011, Japan.
authors.forename: Yasujiro
authors.initials: Y
authors.lastname: Murata
authors.affiliation: Institute of Advanced Energy, Kyoto University, Uji, Kyoto 611-0011, Japan. matsuda@iae.kyoto-u.ac.jp.
authors.forename: Kazunari
authors.initials: K
authors.lastname: Matsuda