采用水热合成技术, 以盐酸、去离子水和钛酸丁酯为反应前驱物, 在透明导电玻璃(FTO)衬底上合成TiO2纳米线束阵列. 采用X射线衍射(XRD)、扫描电子显微镜(SEM)和高分辨透射电镜(TEM)对其结构和形貌进行了分析. 结果表明: 在FTO衬底上形成了垂直排列的具有金红石结构的单晶TiO2纳米线束阵列, TiO2纳米线束由直径4~6nm的几十条纳米线聚集在一起, 形成宽度约110~210nm、长度约3?m的四方柱状结构. 研究了以TiO2纳米线束阵列为光阳极制备的染料敏化太阳能电池的光电性能, 其开路电压为0.72V, 短路电流密度为2.9mA/cm2, 填充因子为0.42, 转换效率为0.88%.
Highly oriented single-crystalline TiO2 nanowire bundle arrays on transparent conductive fluorine- doped tin oxide (FTO) substrates were prepared by hydrothermal method using the precursors of tetrabutyl titanate, deionized water and hydrochloric acid. The structure and morphology characteristics of all the samples were analyzed by X-ray diffraction (XRD), scanning electron microscope (SEM) and transmission electron microscope (TEM). Results show that highly uniform and dense vertical arrays of single crystalline nanowire bundles with flat tetragonal crystallographic planes are formed. The nanowire bundles have a width of 110-210 nm (approximately 20-40 nanowires in each bundle), the single nanowire’s diameter is between 4-6 nm, and the length of the nanowire bundle is about 3μm. Dye-sensitized solar cells (DSSCs) made from oriented TiO2 nanowire arrays anode are studied. The open circuit voltage, short circuit current density and fill factor of the cells are about 0.72 V, 2.9 mA/cm2 and 0.42, respectively. The power conversion efficiency is about 0.88%.
参考文献
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| [2] | Emil E P, Boercker J E, Aydil E S. Electron transport and recombination in polycrystalline TiO2 |
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