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This paper reports the properties of the nitrogendoped titania powder and film as well as the photoelectrochemical behavior of the dye-sensitized solar cells based on the nitrogen-doped nanocrystalline titania electrode

High-efficiency dye-sensitized solar cell based on a nitrogen-doped nanostructured titania electrode.

NANO LETTERS, no. 12 (2005): 2543-2547

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摘要

A highly efficient dye-sensitized solar cell (DSC) was fabricated using a nanocrystalline nitrogen-doped titania electrode. The properties of the nitrogen-doped titania powder, film, and solar cell were investigated. The substitution of oxygen sites with nitrogen atoms in the titania structure was confirmed by X-ray photoemission spectros...更多

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简介
  • A highly efficient dye-sensitized solar cell (DSC) was fabricated using a nanocrystalline nitrogen-doped titania electrode.
  • An 8% conversion efficiency, which was higher than that of SL-D (Solaronix, Ti-Nanoxide D) electrodes, was obtained.[18] This paper reports the properties of the nitrogendoped titania powder and film as well as the photoelectrochemical behavior of the dye-sensitized solar cells based on the nitrogen-doped nanocrystalline titania electrode.
重点内容
  • A highly efficient dye-sensitized solar cell (DSC) was fabricated using a nanocrystalline nitrogen-doped titania electrode
  • Since Gratzel and co-workers developed a new type of solar cells based on the nanocrystalline TiO2 electrode,[1,2,3] dyesensitized solar cells (DSCs) have been attracting much attention because of their high energy conversion efficiency and as a low-cost alternative to commercial solar cells based on silicon.[4,5,6,7,8]
  • We introduced nitrogen-doped titania into the DSC system to enhance the incident photon-to-current conversion efficiency (IPCE) and to stabilize the solar cell due to the replacement of oxygendeficient titania by visible-light-active nitrogen-doped titania
  • This paper reports the properties of the nitrogendoped titania powder and film as well as the photoelectrochemical behavior of the dye-sensitized solar cells based on the nitrogen-doped nanocrystalline titania electrode
  • The enhancement in the IPCE due to the photoresponse of nitrogen-doped titania in the visible light region is supported by the results reported by Lindquist et al.[29] They have demonstrated that the photoinduced current due to the visible light activity of the best nitrogen-doped titania electrode prepared by reactive DC magnetron sputtering can increase significantly by approximately 200 times over those of the undoped titania electrodes.[29]
  • Because our previous study indicated that the dye uptake increased 1.2 times and the IPCE only increased approximately 3%33 for the present study, we can conclude that the intrinsic increase in the IPCE is due to the visible light absorption of the nitrogen-doped titania
结果
  • The nitrogen-doped titania powders exhibited a new absorption peak in the visible light region between 400 and 550 nm.
  • The authors considered that the former was due to a contribution of the photoresponse of nitrogendoped titania in the visible light region, and the latter was caused by the light-scattering effect, resulting from the needle shape of the nanoparticles and the large size of the particles due to the nanocrystalline aggregation during sintering.
  • It has been known that the mixing of the nanoparticles with larger particles[30] or by applying a scattering layer[31,32] on the nanocrystalline film can increase the light-harvesting performance by enhancing the scattering of light as demonstrated by simulations and experimental studies.[30,31,32] The contribution of the scattering light effect to the increase in the IPCE was not prominent and was limited to only approximately 5%.30 the authors concluded that the occurrence of visible light absorption due to the nitrogen-doped titania support intrinsically increases the IPCE value.
  • Because the previous study indicated that the dye uptake increased 1.2 times and the IPCE only increased approximately 3%33 for the present study, the authors can conclude that the intrinsic increase in the IPCE is due to the visible light absorption of the nitrogen-doped titania.
结论
  • Improvement in the IPCE due to the enhanced absorption of the organic dye was observed, it is considered not to be a systematic effect, but occurs by chance in this case; the nanoparticles used in this study were incidentally synthesized to be needle crystalline material of small size, and the properties for the powders and films were quite different from those of the P25 and SL-D.
  • The authors clearly observed a significant enhancement in the IPCE and conversion efficiency of the DSC based on the nitrogendoped titania due to the intrinsic contribution of the photoresponse of the nitrogen-doped titania in the visible light region from 370 to 530 nm.
总结
  • A highly efficient dye-sensitized solar cell (DSC) was fabricated using a nanocrystalline nitrogen-doped titania electrode.
  • An 8% conversion efficiency, which was higher than that of SL-D (Solaronix, Ti-Nanoxide D) electrodes, was obtained.[18] This paper reports the properties of the nitrogendoped titania powder and film as well as the photoelectrochemical behavior of the dye-sensitized solar cells based on the nitrogen-doped nanocrystalline titania electrode.
  • The nitrogen-doped titania powders exhibited a new absorption peak in the visible light region between 400 and 550 nm.
  • The authors considered that the former was due to a contribution of the photoresponse of nitrogendoped titania in the visible light region, and the latter was caused by the light-scattering effect, resulting from the needle shape of the nanoparticles and the large size of the particles due to the nanocrystalline aggregation during sintering.
  • It has been known that the mixing of the nanoparticles with larger particles[30] or by applying a scattering layer[31,32] on the nanocrystalline film can increase the light-harvesting performance by enhancing the scattering of light as demonstrated by simulations and experimental studies.[30,31,32] The contribution of the scattering light effect to the increase in the IPCE was not prominent and was limited to only approximately 5%.30 the authors concluded that the occurrence of visible light absorption due to the nitrogen-doped titania support intrinsically increases the IPCE value.
  • Because the previous study indicated that the dye uptake increased 1.2 times and the IPCE only increased approximately 3%33 for the present study, the authors can conclude that the intrinsic increase in the IPCE is due to the visible light absorption of the nitrogen-doped titania.
  • Improvement in the IPCE due to the enhanced absorption of the organic dye was observed, it is considered not to be a systematic effect, but occurs by chance in this case; the nanoparticles used in this study were incidentally synthesized to be needle crystalline material of small size, and the properties for the powders and films were quite different from those of the P25 and SL-D.
  • The authors clearly observed a significant enhancement in the IPCE and conversion efficiency of the DSC based on the nitrogendoped titania due to the intrinsic contribution of the photoresponse of the nitrogen-doped titania in the visible light region from 370 to 530 nm.
表格
  • Table1: Performance Characteristics of the Dye-Sensitized Cells Based on the Nitrogen-Doped and Pure Titania Electrode
Download tables as Excel
基金
  • This work was supported partly by the Japan Science and Technology Corporation
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