利用電泳法製備多層奈米二氧化鈦薄膜及散射層應用於染料敏化太陽能電池之研究

Applications of multilayer nanocrystalline TiO2 thin films and scattering layer prepared by electrophoretic deposition on dye-sensitized solar cells

康子鴻(Tz-Hung Kang)

指導教授 ： 閔庭輝

國立虎尾科技大學/電機資訊學院/光電與材料科技研究所/碩士(2010年)

摘要

本研究以電泳沉積法製備多層二氧化鈦(TiO2)薄膜與散射層應用於染料敏化太陽能電池(dye-snesitized solar cells, DSSCs)。由FE-SEM分析，以電泳沉積法製備二氧化鈦薄膜具有多孔性結構，其多孔性結構能增加更多染料之填充。且利用電泳沉積法製備多層二氧化鈦薄膜，能有效的改善薄膜表面之裂縫，而加了散射層之後，能增加入射光的行走路徑，進而提高入射光與二氧化鈦粒子之間的碰撞機率，以提升染料敏化太陽能電池之效率。XRD分析二氧化鈦薄膜，其薄膜較強的結晶相為銳鈦礦相。以UV-Vis分析二氧化鈦薄膜吸附N3染料，吸收波長明顯從紫外光提升至可見光範圍，對於光電轉換效率有很大的幫助。在仿照太陽光模擬器之燈源照射下(AM 1.5, 100mW/cm2)，二氧化鈦薄膜染料敏化太陽能電池的能量轉換效率為3.243％。由EIS分析可發現，當二氧化鈦薄膜厚度增加時，Rk的電阻值就變小，其主要原因是跟染料吸附量有關；照光後染料激發之電子增多，使得電阻值下降。

關鍵字

電泳法 ； 二氧化鈦 ； 染料敏化太陽能電池

並列摘要

The study is mainly to discuss that the effects of multilayer nanocrystalline TiO2 thin films and scattering layer prepared by electrophoretic deposition (EPD) on the performance of the dye-sensitized solar cells (DSSCs). In the field emission scanning electron microscopy (FE-SEM) analysis, TiO2 thin films prepared by EPD have the porous structure. The porous structure is advantageous in the dye-loading capacity. And used multilayer nanocrystalline TiO2 thin films prepared by EPD, the cracks can improved on the thin films surface. When added scattering layer in DSSCs, it can increase the path length of the incident light in the nanocrystalline TiO2 thin films. From the results of XRD analysis, the strong crystallization of TiO2 thin film is the anatase phase. UV-Vis spectrophotometer analysis can tell the situation of N3 dye adsorbing on the TiO2 thin films; the absorption wavelength obviously promotes from the ultraviolet ray to the visible light scope, and this is great help for conversion efficiency of DSSCs. Under the irradiation of the sunlight simulator (AM 1.5, 100 mW/cm2), the energy conversion efficiency of DSSCs with the TiO2 thin films is 3.243%. In the electrochemical impedance spectroscopy (EIS) analysis, the value of Rk decreases with increasing the thickness of TiO2 thin films, the primary cause is related with the dye adsorptive capacity. It may be due to the stimulation of illumination for the electron in the dye, resulting in the reduced of the Rk.

並列關鍵字

electrophoretic deposition ； TiO2 ； dye-sensitized solar cells

參考文獻

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