製備一維銳鈦礦二氧化鈦奈米結構並應用於太陽電池與電致變色元件

陳景智

doi:10.6845/NCHU.2013.00804

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製備一維銳鈦礦二氧化鈦奈米結構並應用於太陽電池與電致變色元件

One-Dimensional Nanostructure Engineering of Anatase Titanium Dioxide for Solar Cell and Electrochromism Applications

陳景智 , Ph.D　　Advisor：林寬鋸　　

英文 DOI： 10.6845/NCHU.2013.00804

一維奈米結構；二氧化鈦；染料敏化太陽電池；電致變色； one-dimensional nanostructure ； titanium dioxide ； dye-sensitized solar cell ； electrochromism

Abstract │ Reference (172) │ Altmetrics

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In this thesis, a series of one-dimensional TiO2 nanostructure engineering approaches were investigated and applied to the dye-sensitized solar cell and electrochromic device research fields.
  According to previous reports, the superiorities of large surface area and fast charge transportation properties of the one-dimensional TiO2 nanostructure have been confirmed as compared with zero-dimensional nanoparticle. In order to improve the interfacial contact property between nanostructure and subtract, and enhance the performances of aforementioned devices. In recent years, many researchers have been devoted to develop the methods that could prepare one-dimensional TiO2 nanostructures directly on substrates.
   Therefore, in our study, we first proposed a simple and low cost alkaline hydrothermal method, in association with a thin sputtered Ti layer, to fabricate the chain-networked nanostructure directly on transparent conductive glass. Such structure showed better electron transport conductivity and larger porous conformation than that made by nanoparticles, resulted in an approximately 36% enhancement of conversion efficiency in the oligomer electrolyte-based dye-sensitized solar cells.
  Correspondingly, in the basis of the prior knowledge, we further altered the hydrothermal reacting conditions and found a specific TiO2 nanowire structure can be simply grown onto the conductive glasses. Ascribed to the characteristic random standing and high porous structure of the TiO2 nanowires, the refractive index of TiO2 was able to reduce from 2.5 to 1.2, thus resulted in a splendid antireflection property on conductive glasses. Additionally, TiO2 is a candidate material for electrochromism. Upon these discoveries, in this study, we were able to achieve a concurrent antireflective and electrochromic coating in one synthetic process. Furthermore, electrochromic devices fashioned from these TiO2 nanowires were found to display enhanced optical transparency in the visible range, better color contrast, and faster color-switching time in comparison to devices made from nanoparticles with the same 
coating thickness.

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References to Chapter 1
連結：
(2) Kavan, L. In Dye-Sensitized Solar Cells; Kalyanasundaram, K., Ed.; EPFL: 2010, p 45.
連結：
(3) Carp, O.; Huisman, C. L.; Reller, A. Prog. Solid State Chem. 2004, 32, 33.
連結：
(4) Hagfeldt, A.; Graetzel, M. Chem. Rev. 1995, 95, 49.
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(5) Pfaff, G.; Reynders, P. Chem. Rev. 1999, 99, 1963.
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