染料敏化太陽能電池工作電極之研究

Study for Work Electrode in the Dye-Sensitized Solar Cell

藍泰仰(Tai-Yang Lan)

指導教授 ： 段葉芳

國立臺北科技大學/工程學院/化學工程研究所/碩士(2010年)

摘要

本實驗使用三種不同組成的商用TiO2 (P25、ST21、ST01)製作染料敏化太陽能電池之工作電極，P25粒徑為21 nm，晶相組成為75%銳鈦礦相與25%金紅石相；ST21粒徑為20 nm，其晶相組成為完全之銳鈦礦相；ST01粒徑為7 nm，其晶相組成也為完全之銳鈦礦相。
在XRD的結果中可得知經過450度高溫鍛燒後，P25之金紅石相特徵峰雖有降低，但並未能完全轉為銳鈦礦相，ST21與ST01之晶相則維持在銳鈦礦相的形式。我們使用P25與ST21在相同膜厚條件下，以UV-Vis 吸收光譜計算出之染料吸附量與XRD圖之對照比較，可以推測出銳鈦礦相對於吸附染料分子的能力較金紅石相更為良好。從SEM與白光干涉儀可以觀察出其薄膜之表面形態在鍛燒前後並無明顯的差異，剖面結構也為一緻密排列。而利用紅外光譜配件(Drifts)觀察N719光敏化染料分子在TiO2薄膜表面之吸附機制，發現染料N719與三種TiO2薄膜之間的COOH配位基，皆是以bidentate或chelating的形式吸附鍵結，此種化學吸附形式具有較高之吸附穩定性。

關鍵字

太陽能電池 ； 工作電極 ； 染料敏化 ； N719 ； 二氧化鈦

並列摘要

In this study, first of all, the proper thickness of the semiconductor electrodes is needed to reach the highest photoelectric conversion efficiency. Secondly, three different composition of the commercial titanium dioxide (P25, ST21, ST01) are used to as working electrode. P25 size is 21 nm, crystalline phase is 75% anatase and 25% rutile. ST21 size is 20 nm, crystalline phase is complete anatase. ST01 size is 7 nm, crystalline phase is complete anatase.
The results of the experiment from XRD, the crystalline phase of titanium dioxide thin films are not obviously changed after calcination at 450 degree Celsius.By using the SEM and the white light interferometer, the surface morphology of the films before and after the calcinations is no striking difference in the profile structure which is intensive.
Finally,a form of adsorbed combination between dye N719 and titanium dioxide film which is bidentate or chelating bond through using the carboxylic acid group is able to found by observing the adsorption mechanism of N719 inside the surface of the titania film with infrared spectroscopy accessories (Drifts).

並列關鍵字

Solar Cells ； Work Electrode ； Dye-sensitized ； N719 ； Titanium Dioxide

參考文獻

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