光增益型二氧化鈦奈米粒之製備、分析及應用

Preparation, Characterization and Application of Light-Harvesting TiO2 nanoparticles

謝鈞涵(Jun-Han Hsieh)

指導教授 ： 蘇昭瑾

國立臺北科技大學/工程學院/有機高分子研究所/碩士(2011年)

摘要

本研究第一部分，以水熱法自製銳鈦礦相之二氧化鈦奈米粒(A-TiO2)，與其他商業化之二氧化鈦奈米粒，如：DP-25、ST-01、ST-21、ST-31相比較，探討其經由500 oC鍛燒後粒子改變之情形，以及製備成薄膜光陽極應用於染敏電池上效率的比較。由TEM結果發現自製之銳鈦礦相二氧化鈦奈米粒經由鍛燒過程後，其團聚現象較其他商業化二氧化鈦不明顯，有較佳之光電轉化效率。
第二部分，利用正四丁基氧化鈦為前驅物，水熱法製備花狀之大顆粒二氧化鈦奈米粒(F1-TiO2)。探討以不同的水熱時間，其粒子表面形態改變之情形。其鐵氟龍內罐之填充率為60 %，水熱24小時，可製得大約200~300 nm之大顆粒二氧化鈦，經由TEM拍攝結果可得知，其粒子是由一根根棒狀所組成之大顆粒花狀二氧化鈦。將花狀二氧化鈦(F1-TiO2)加入松油醇以及乙基纖維素製成油性漿料，與其他商業化之散射層(CR-EL，R-TiO2)作電池效率以及其他電性分析之比較。
第三部分，以商業化二氧化鈦ST-01加入氫氟酸，製備出方型結構之二氧化鈦奈米粒(Cubic-like TiO2，C-TiO2)，以不同之水熱時間處理，隨著時間的增加，方型結構更加明顯。取C-TiO2粉末加入適量之乙基纖維素以及松油醇製備成油性漿料，將漿料製備成染料敏化太陽能電池之光陽極，由電化學阻抗分析可得知，其類一維結構具有較佳的有效電子傳導途徑。將方型結構二氧化鈦漿料作為散射層塗佈於上層，與其他商業化之散射層(Dyesol，D-TiO2)作電池效率以及其他電性分析之比較。

關鍵字

水熱法 ； 鋭鈦礦 ； 花狀二氧化鈦 ； 方型結構二氧化鈦 ； 散射層 ； 染料敏化太陽能電池

並列摘要

This dissertation can be divided into three main parts. Part I. The anatase TiO2 (A-TiO2) nanoparticles were prepared by hydrothermal method. In order to reveal the performance of A-TiO2 nanoparticles, the commercial TiO2 nanoparticles such as DP-25, ST-01, ST-21, and ST-31 were compared with A-TiO2 nanoparticles. Further, the morphological change of nanoparticles and the efficient thin film photoanode after annealing at 500 oC were discussed. From TEM observation, it clearly reveals that the commercial TiO2 nanoparticles resulting in the formation of aggregates compare to A-TiO2 nanoparticles. Therefore, the A-TiO2 has shown excellent photoelectron conversion energy.
Part II. The flower-like TiO2 (F1-TiO2) nanoparticles were prepared by hydrothermal method using titanium (IV) n-butoxide as the precursor. The changes in surface morphology of the particles were discussed by varying the hydrothermal reaction time. F1-TiO2 particles of around 200~300 nm were obtained at hydrothermal reaction time of 24 hours and 60 % packing rate in the Teflon jar. The obtained F1-TiO2 particles were composed of rod-like titanium dioxide which was confirmed by TEM images. Further, the F1-TiO2 oil paste was prepared with the addition of ethyl cellulose/ethanol and terpineol. Then the F1-TiO2 oil paste was coated as a scattering layer on top of A-TiO2 layer. To evaluate the cell performance, cell efficiency and other electrical measurements were analyzed in comparison with commercial scattering layer, such as CR-EL (R-TiO2).
Part III. The cubic-like structure TiO2 (C-TiO2) nanoparticles were prepared by hydrothermal method using the commercialized ST-01 titanium dioxide nanoparticles. The cubic-like structure was obtained by increasing the hydrothermal time. C-TiO2 paste was coated as scattering layer in order to prepare the working electrode in DSSC. Hence, the quasi one dimensional (1D) structure showed an excellent effective electron transport, confirmed by EIS analysis. In this work, DSSC working electrode was prepared by coating A-TiO2 paste as a first layer onto a transparent conductive glass using a doctor-blade technique. Then the C-TiO2 paste were employed as scattering layer. In addition, to analyze the effect of the C-TiO2 (scattering layers), commercial scattering TiO2 nanoparticles such as Dyesol were compared and cell performance were analyzed.

並列關鍵字

Hydrothermal ； Anatase ； Flower-TiO2 ； Cubic-TiO2 ； Scattering layer ； Dye-sensitized solar cell

參考文獻

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