title: Control of charge dynamics through a charge-separation interface for all-solid perovskite-sensitized solar cells.
abstract: The relationship between the structure of the charge-separation interface and the photovoltaic performance of all-solid dye-sensitized solar cells is reported. This cell is composed of porous a TiO2/perovskite (CH3NH3PbI(x)Cl(3-x))/p-type organic conductor. The porous titania layer was passivated with Al2O3 or Y2O3 to remove surface traps of the porous titania layer. Both passivations were effective in increasing the efficiency of the solar cell. Especially, the effect of Y2O3 passivation was remarkable. After passivation, the efficiency increased from 6.59 to 7.5%. The increase in the efficiency was discussed in terms of the electron lifetime in TiO2, the thermally stimulated current, the measurement of the microwave refractive carrier lifetime, and transition absorption spectroscopy. It was proven that surface passivation resulted in retardation of charge recombination between the electrons in the porous titania layers and the holes in the p-type organic conductors.
authors.affiliation: Graduate School of Life Science and Systems Engineering, Kyushu Institute of Technology, 2-4 Hibikino, Wakamatsu-ku, Kitakyushu, Fukuoka 808-0196 (Japan); CREST (Japan) Science and Technology Agency (JST), 4-1-8 Honcho Kawaguchi, Saitama 332-0012 (Japan). ogomi@life.kyutech.ac.jp.
authors.forename: Yuhei
authors.initials: Y
authors.lastname: Ogomi
authors.forename: Kenji
authors.initials: K
authors.lastname: Kukihara
authors.forename: Shen
authors.initials: S
authors.lastname: Qing
authors.forename: Taro
authors.initials: T
authors.lastname: Toyoda
authors.forename: Kenji
authors.initials: K
authors.lastname: Yoshino
authors.forename: Shyam
authors.initials: S
authors.lastname: Pandey
authors.forename: Hisayo
authors.initials: H
authors.lastname: Momose
authors.forename: Shuzi
authors.initials: S
authors.lastname: Hayase
keywords: dye-sensitized solar cells; electron lifetimes; energy conversion; sensitizers; surface passivation