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本文采用水热反应法,通过改变合成条件,经XRD和FESEM表征,证实合成了四方金红石相异形复层(阵列-团簇)结构的TiO2薄膜。合成薄膜的下层是TiO2的阵列,上层是团簇状的TiO2,并且构成阵列和团簇的每个方柱又由多根纳米棒(25~65 nm)组成。上层团簇的生成量和厚度可以通过改变反应物的初始浓度、反应时间和生长基片的角度进行调控。将这种异形复层结构薄膜试用于染料敏化太阳能电池(DSSC)光阳极,发现其光电转化效率比单层阵列TiO2薄膜提高了2.6倍。由此表明TiO2这种以纳米棒为单元结构的异形复层薄膜,上层团簇结构有利于产生采光作用以及吸附微粒的作用,下层阵列结构有利于载流子的定向快速传输,其复合结构的形成,致使光电转换效果明显提高。
In this paper, the hydrothermal reaction method was adopted to modify the synthesis conditions, and characterized by XRD and FESEM. It was confirmed that the TiO2 thin film with tetragonal rutile shaped composite (array-cluster) structure was synthesized. The lower layer of the composite film is an array of TiO2, the upper layer is a cluster of TiO2, and each of the square columns that make up the array and clusters consists of multiple nanorods (25-65 nm). The formation and thickness of the upper cluster can be controlled by changing the initial concentration of the reactants, the reaction time and the growth substrate. The heterostructured multilayered structure film was applied to the dye-sensitized solar cell (DSSC) photoanode and its photoelectric conversion efficiency was 2.6 times higher than that of the single-layer TiO2 film. This shows that TiO2 nanorods as the unit structure of heterostructured multilayer film, the upper cluster structure is conducive to produce lighting and the role of adsorption of particles, the lower the array structure is conducive to the carrier fast directional transmission, the composite structure of Formed, resulting in significantly improved photoelectric conversion effect.