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TiO2 Surface State Control for Dye Sensitized Solar Cells with High Efficiency and the Solidification -Fabrication of Charge Carrier Path

Published online by Cambridge University Press:  01 February 2011

Fumi Inakazu ,
Yuhei Ogomi ,
Yusuke Noma ,
Yoshihisa Fujita ,
Mitsuru Kono ,
Yoshihiro Yamaguchi ,
Yohie Kashiwa ,
Takeshi Kogo  and
Shuzi Hayase
Fumi Inakazu
Affiliation:
inamazu-fumi@edu.life.kyutech.ac.jp, Kyushu Institute of Technology, Kitakayushu, 808-0196, Japan
Yuhei Ogomi
Affiliation:
ogomi-yuhei@edu.life.kyutech.ac.jp, Kyushu Institute of Technology, Kitakayushu, 808-0196, Japan
Yusuke Noma
Affiliation:
noma-yusuke@edu.life.kyutech.ac.jp, Kyushu Institute of Technology, Kitakayushu, 808-0196, Japan
Yoshihisa Fujita
Affiliation:
fujita-yoshihisa@edu.life.kyutech.ac.jp, Kyushu Institute of Technology, Kitakayushu, 808-0196, Japan
Mitsuru Kono
Affiliation:
kohnomi@nscc.co.jp, Nippon Steel Chemical Co. Ltd., Kitakyushu, 804-8503, Japan
Yoshihiro Yamaguchi
Affiliation:
yamaguys@nscc.co.jp, Nippon Steel Chemical Co. Ltd., Kitakyushu, 804-8503, Japan
Yohie Kashiwa
Affiliation:
kashiwa-yohei@edu.life.kyutech.ac.jp, Kyushu Institute of Technology, Kitakayushu, 808-0196, Japan
Takeshi Kogo
Affiliation:
kogo-takeshi@edu.life.kyutech.ac.jp, Kyushu Institute of Technology, Kitakayushu, 808-0196, Japan
Shuzi Hayase
Affiliation:
hayase@life.kyutech.ac.jp, Kyushu Institute of Technology, Kitakayushu, 808-0196, Japan
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Abstract

Improvement of photovoltaic performance for dye sensitized solar cells (DSC) is discussed in terms of electron-path and ion-path. In order to make electron path, we focused on passivation of TiO2 surface states which are observed by thermally stimulated current (TSC). The TiO2 surface was well-passivated with dye molecules under pressurized CO2 atmosphere. It was found that DSC cells prepared by a CO2 process (Cell-CO2) had higher efficiency than those prepared by a conventional dipping process (Cell-DIP) and the higher efficiency was associated with low TiO2-surface state, high electron diffusion coefficient and long electron life time in TiO2 for the Cell-CO2. In addition, dye-staining under pressurized CO2 atmosphere had advantages over a conventional dipping process on rapid dye-uptake and less dye aggregation. In order to fabricate ion-path in solidified electrolyte, we focused on surface modification of nano-materials. Surface of nano-materials such as TiO2-nanoparticles and porous alumina films were modified with imidazolium iodide moieties consisting of long alkyl chains which render surface-molecules self-organized. Redox-species are concentrated on the self-organized molecules and make ion-path. We propose quasi-solid electrolyte system consisting of two layers having different charge carrier concentration to keep high photoconversion efficiencies even after solidification.

Keywords

photovoltaicionic conductornanostructure
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1031: Symposium H – Nanostructured Solar Cells , 2007 , 1031-H08-03
Copyright
Copyright © Materials Research Society 2008

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