利用電泳法製備奈米二氧化鈦與氧化鋅薄膜應用於可撓式染料敏化太陽能電池之研究

本研究選擇電泳沉積法製作二氧化鈦(TiO2)與氧化鋅(ZnO)薄膜電極，電泳沉積法之優點包括製程簡單、沉積速率快、製程溫度低，適用於材料鍍膜上。利用電泳法製備TiO2與ZnO薄膜電極，並改善奈米薄膜結構，藉由此方法製作高效率的可撓式染料敏化太陽能電池。本論文研究以電泳沉積法製備奈米TiO2與ZnO薄膜。XRD分析商用二氧化鈦奈米粒子進行電泳法沉積薄膜，其薄膜結晶相為銳鈦礦相，經過壓縮後薄膜晶同為銳鈦礦相。氧化鋅部份結晶性較佳，相對繞射強度較強。UV-Vis分析壓膜前後二氧化鈦和氧化鋅薄膜吸附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。效率方面，二氧化鈦薄膜經過壓縮製程後，在厚度1.7μm時，有最佳光電轉換效率，VOC = 0.74 V, JSC = 6.96 mA, F.F =53, η=2.73%。薄膜壓縮後，厚度變薄有助於縮短電子傳遞的路徑，並相對減少電阻，增加染料的吸附性。而氧化鋅薄膜，壓縮後效率變差，本身結構破壞，薄膜結構孔洞減少，染料分子團聚雜亂的堆疊方式，造成鈍化電子注入效率的因素，光電流減少，降低電池的效率。

關鍵字

電泳法；二氧化鈦；氧化鋅；染料敏化太陽能電池

並列摘要

Because electrophoretic method (EPD) has the advantage of high-speed deposition and low-temperature production suitable for plating film material, we use this method to make the thin film electrode of TiO2 and ZnO. Utilizing EPD to manufacture TiO2 and ZnO thin film can improve nano thin film structure. This method is applied to production of high-efficiency dye-sensitization solar cells. The paper research of EPD method was popularly used when making the thin film electrode of TiO2 and ZnO. We analyzed the XRD to dissect a titanium dioxide nanoparticles to deposite on the thin-film by EPD. The crystallization of thin film is the anatase phase, while the same anatase phase after compression. The crystallization of zinc oxide is better, and the relative diffraction intensity is stronger. UV-Vis spectrophotometer analysis can tell the situation of N3 dye adsorbing on the thin films of TiO2 and ZnO; the absorption wavelength obviously promotes from the ultraviolet ray to the visible light scope, and this has great help toward the electro-optic transfer efficiency. Efficiency aspect, the compressed TiO2 thin films have the best energy conversion efficiency when thickness is 1.7μm. VOC = 0.74V, JSC = 6.96 mA, F.F =53, η=2.73%. The thinner thickness of compressed thin film is helpful to the reduction of electron transfer way, and reduces resistance and increases adsorbability toward dye relatively. However, the efficiency of zinc oxide thin film after compression becomes worse due to disarrangement of its structure, hole reduction on thin film structure, and disordered pileup format of reuniting dye molecules. Above reasons lead to the deactivation of electron-injection efficiency and the loss of current, thus compressed ZnO thin film reduces the cell efficiency.