Title

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

Translated Titles

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

DOI

10.6845/NCHU.2013.00804

Authors

陳景智

Key Words

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

PublicationName

中興大學化學系所學位論文

Volume or Term/Year and Month of Publication

2013年

Academic Degree Category

博士

Advisor

林寬鋸

Content Language

英文

Chinese Abstract

在本篇論文中,我們提出了以製備二氧化鈦的一維奈米結構為主題,並將之於應用在染料敏化太陽電池(dye-sensitized solar cell)以及電致變色玻璃元件(electrochromic device)的研究上。 一維的二氧化鈦結構已被證實其比表面積以及電子傳遞等性質皆優於傳統零維的奈米粒子。而為了與導電基板取得更好的介面接觸,提升並突破現有的成果,近年來研究者無不致力於發展直接製備一維二氧化鈦奈米結構於基板的方法。 因此,在一開始的研究中,我們提出一個簡單以及價格低廉的鹼水熱處理法,並以一層鈦金屬薄膜的包覆,開發出直接於玻璃基材上製備以一維鍊狀二氧化鈦結構構成的三維網絡電極。此結構提供了較佳的電子傳導性質以及較大的多孔性結構,使得在以寡聚合物為基底的準固態染料敏化太陽電池中,與傳統奈米粒子電極相比,取得了近36%轉換效率的提升。 而隨後,基於製備網絡電極的經驗,我們藉由調整鹼水熱法的實驗條件,開發出了一層二氧化鈦奈米線的結構直接成長於導電玻璃上。因為此結構具有不規則的斜向生長與高孔洞性質,我們發現此種結構可以有效降低二氧化鈦的折射率從2.5至1.2,並在導電玻璃上具有相當好的抗反射效果。同時二氧化鈦本身是一個良好的電致變色材料,因此,在此研究中,我們實現了以簡單的實驗方法就可以一次取得同時具有抗反射與電致變色性質的薄膜。在元件性能的表現上,以二氧化鈦奈米線為主的元件其穿透度、變色效果、變色時間均優於相同厚度下的二氧化鈦奈米粒子。

English Abstract

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.

Topic Category 基礎與應用科學 > 化學
理學院 > 化學系所
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