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Control of Charge Dynamics through a Charge‐Separation Interface for All‐Solid Perovskite‐Sensitized Solar Cells
Author(s) -
Ogomi Yuhei,
Kukihara Kenji,
Qing Shen,
Toyoda Taro,
Yoshino Kenji,
Pandey Shyam,
Momose Hisayo,
Hayase Shuzi
Publication year - 2014
Publication title -
chemphyschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.016
H-Index - 140
eISSN - 1439-7641
pISSN - 1439-4235
DOI - 10.1002/cphc.201301153
Subject(s) - passivation , materials science , perovskite (structure) , energy conversion efficiency , solar cell , charge carrier , carrier lifetime , absorption (acoustics) , perovskite solar cell , microwave , chemical engineering , layer (electronics) , analytical chemistry (journal) , optoelectronics , nanotechnology , chemistry , silicon , composite material , organic chemistry , physics , quantum mechanics , engineering
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 TiO 2 /perovskite (CH 3 NH 3 PbI x Cl 3− x )/p‐type organic conductor. The porous titania layer was passivated with Al 2 O 3 or Y 2 O 3 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 Y 2 O 3 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 TiO 2 , 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.