Applications of nanocrystalline TiO2 and ZnO films prepared by electrophoretic deposition on flexible dye-sensitized solar cells

• Main Authors: Wei-Ting Chen, 陳維婷
• Other Authors: Teen-Hang Meen
• Format: Others
• Language: zh-TW
• Published: 2010
• Online Access: http://ndltd.ncl.edu.tw/handle/62697d

碩士 === 國立虎尾科技大學 === 光電與材料科技研究所 === 98 === 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.