Dynamics of charge recombination at surface observed by highly sensitive transient absorption spectrometer
| Project/Area Number |
14540483
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Physical chemistry
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| Research Institution | National Institute of Advanced Industrial Science and Technology (AIST) |
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Principal Investigator |
KATOH Ryuzi National Institute of Advanced Industrial Science and Technology (AIST), Senior Researcher, 計測フロンティア研究部門, 主席研究員 (60204509)
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| Project Period (FY) |
2002 – 2003
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| Project Status |
Completed (Fiscal Year 2003)
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| Budget Amount *help |
¥2,900,000 (Direct Cost: ¥2,900,000)
Fiscal Year 2003: ¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 2002: ¥2,100,000 (Direct Cost: ¥2,100,000)
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| Keywords | Transient absorption / Charge recombination / Highly sensitive measurements / Pulsed laser / 電荷再結合反応 |
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| Research Abstract |
Charge recombination at interface is an interesting process and it has been applied to solar energy conversion devices, such as photocatalysts and dye-sensitized solar cells. Upon photoexcitation charge separation occurs and then cations and anions are produced. These are non-emitive species and therefore dynamics of these species cannot be probed by fluorescence spectroscopy. Transient absorption technique is a powerful tool for this target. However, in reality it is quite difficult to probe these phenomena due to low sensitivity. Thus, we proposed to develop highly sensitive transient absorption spectrometer.
Firstly, we developed highly sensitive transient absorption spectrometer. Using the spectrometer, we can observed very small absorbance change (<10^<-6>). This is enough sensitivity to observe transient absorption in mono-layer film.
We studied charge separation and recombination dynamics of dye-sensitized semiconductor films, organic dyes adsorbed on oxide semiconductors (TiO_2,ZnO, SnO_2 etc.). We found that quantum yield of the charge separation is very sensitive to the exciting light intensity and it becomes constant at lower intensity. We also estimated absolute quantum yield of the charge separation. We also studied primary process of photoexcitation of photocatalyst, such as TiO_2 films. Upon photoexcitation electrons and holes are produced. Using our spectrometer reactivity of these species can be studied.
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Report
(3 results)
Research Products
(10 results)
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[Publications] 加藤, 古部, 吉原, 原, 藤橋, 高野, 村田, 荒川, 立矢: "Efficiencies of Electron Injection from Excited N3 Dye into Nanocrystalline Semiconductor (ZrO_2, TiO_2, ZnO, Nb_2O_5, SnO_2, In_2O_3) Films"J.Phys.Chem.B. 108. 4818-4822 (2004)
Description
「研究成果報告書概要(和文)」より
Related Report
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[Publications] R.Katoh, A.Furube, T.Yoshihara, K.Hara, G.Fujihashi, S.Takano, S.Murata, H.Arakawa, M.Tachiya: "Efficiencies of Electron Injection from Excited N3 Dye into Nanocrystalline Semiconductor (ZrO_2,TiO_2, ZnO, Nb_2O_5,SnO_2,In_2O_3) Films"J.Phys.Chem. B. 108. 4818-4822 (2004)
Description
「研究成果報告書概要(欧文)」より
Related Report
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[Publications] 加藤, 古部, 吉原, 原, 藤橋, 高野, 村田, 荒川, 立矢: "Efficiencies of electron injection from excited N3 dye into nano-crystalline semiconductor (ZrO_2, TiO_2, ZnO, Nb_2O_5, SnO_2, In_2O_3) films"J.Phys.Chem.B. (印刷中).
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