二氧化钛纳米线阵列的制备及其染料敏化太阳能电池性质的研究

发布时间：2018-03-24 06:00

本文选题：二氧化钛纳米线阵列　切入点：染料敏化　出处：《东北师范大学》2014年硕士论文

【摘要】：一维单晶TiO2纳米线阵列由于其优异的光生电荷分离与输运特性而受到光电化学研究领域的广泛关注。特别是TiO2单晶纳米线阵列的可控制备与光电转换应用是近年来国内外研究的热点。本文分别采用水热和溶剂热方法研究了一维TiO2纳米线阵列生长的影响因素，获得了制备高比表面积TiO2纳米线阵列的制备方法，并得到了光电转换效率高达5.46%的染料敏化太阳能电池器件。具体研究内容如下：采用水热合成方法制备了二氧化钛纳米线阵列，研究了生长基底、反应时间、盐酸含量以及氯化钠、盐酸多巴胺、PVP、PEG等添加剂对水热体系中二氧化钛纳米线阵列生长的影响规律。研究结果表明，反应体系中盐酸及氯化钠的增加明显抑制了二氧化钛纳米线径向的生长。采用溶剂热合成方法制备二氧化钛纳米线阵列，研究了反应前驱物（钛源、DEG、盐酸）浓度、反应时间、反应温度等对溶剂热体系中二氧化钛纳米线阵列生长的影响规律。研究结果表明，溶剂热体系有利于大长径比二氧化钛纳米线阵列的生长，在短时间可以制备出高比表面积、高密度取向生长纳米线阵列。以2小时溶剂热反应制备的二氧化钛纳米线阵列为光阳极，组装染料敏化太阳能电池器件。研究了钛酸纳米片（TN）晶种层、热退火及紫外臭氧处理对电池器件性能的影响。结果表明，预先沉积的TN层不仅为TiO2纳米线的生长提供成核位点，同时有效地阻挡了电解质溶液与FTO表面的电荷复合，其所构建的电池器件的光电转换效率达到了4.36%，比未沉积TN层的纳米线阵列光阳极电池器件提高6%。进一步的UV/O3处理，有效地去除了TiO2纳米线阵列表面的碳残余，，使其所构建电池的光电转换效率进一步提高到5.46%，显示出优异的太阳能光电转换特性。
[Abstract]:One-dimensional single crystal TiO2 nanowire arrays have attracted wide attention in the field of photochemistry for their excellent photocharge separation and transport properties. In particular, the controllable fabrication and photoelectric conversion of TiO2 single crystal nanowire arrays have been widely used in recent years. In this paper, the factors affecting the growth of one-dimensional TiO2 nanowire arrays were studied by hydrothermal and solvothermal methods. The preparation method of TiO2 nanowire array with high specific surface area was obtained, and the photoelectricity conversion efficiency of the dye sensitized solar cell device was up to 5.46%. The detailed research contents are as follows:. Titanium dioxide nanowire arrays were prepared by hydrothermal synthesis. The growth substrate, reaction time, hydrochloric acid content and sodium chloride were studied. The effect of additives such as dopamine hydrochloride and PVP- PEG on the growth of titanium dioxide nanowires array in hydrothermal system was studied. The results showed that the increase of hydrochloric acid and sodium chloride obviously inhibited the radial growth of titanium dioxide nanowires. TIO _ 2 nanowire arrays were prepared by solvothermal synthesis. The concentration of the precursor (titanium source DEG, hydrochloric acid) and the reaction time were studied. The effect of reaction temperature on the growth of TIO _ 2 nanowire arrays in solvothermal system. The results show that solvothermal system is favorable to the growth of TIO _ 2 nanowire arrays with large aspect ratio and high specific surface area can be prepared in a short time. Nanowire arrays were grown with high density orientation. The dye sensitized solar cell devices were assembled with titanium dioxide nanowire arrays prepared by 2 hours solvothermal reaction as photoanode. The seed layer of TNO _ 3 nanocrystalline titanate was studied. The effects of thermal annealing and ultraviolet ozone treatment on the performance of TiO2 devices show that the pre-deposited TN layer not only provides nucleation sites for the growth of TiO2 nanowires, but also effectively blocks the charge recombination between electrolyte solution and FTO surface. The photoelectric conversion efficiency of the fabricated battery device is 4.36, which is 6 times higher than that of the undeposited TN layer nanowire array photoanode battery device. Further UV/O3 treatment can effectively remove the carbon residue on the surface of TiO2 nanowire array. The photovoltaic conversion efficiency of the battery is further improved to 5.46, showing excellent photovoltaic conversion characteristics.
【学位授予单位】：东北师范大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TB383.1;TM914.4

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