Composite thin films of titanium dioxide nanoparticles with particle size distribution prepared by electrophoresis
Composite thin films of titanium dioxide nanoparticles with particle size distribution prepared by electrophoresis
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DOI：
10.1016/j.matchemphys.2015.11.023
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发表时间：
2016-02
影响因子：
4.6
通讯作者：
R. Kawakami;Y. Sato;Yasushige Mori;S. Yoshikado
中科院分区：
文献类型：
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作者：
R. Kawakami;Y. Sato;Yasushige Mori;S. Yoshikado
为了提高染料敏化太阳能电池（DSSC）的能量转换效率，采用恒流电泳法制备了两种不同粒径和表面性质的TiO 2纳米粒子的胶体混合物，制备了纳米二氧化钛（TiO 2）复合薄膜作为电池负极。第一种类型是在本研究中合成的，尺寸约为5 nm;这些被称为TNP。第二类是商业上获得的TiO 2纳米颗粒（P25），其尺寸约为20 nm。在电泳过程中改变P25与TNP的质量比。因为TNP小并且膜具有高比表面积，所以沉积膜以使靠近DSSC的入射窗的区域中的P25与TNP的质量比最小化。薄膜厚度的上限显着增加相比，在由一种或两种TiO 2纳米粒子，但没有粒度梯度的胶体沉积。提出了一种计算P25与TNP质量比、数均粒径梯度和具有粒径梯度的薄膜的比表面积的方法。入射光的收集效率在宽波长范围内得到提高，结果，使用这些薄膜制造的DSSC的能量转换效率得到提高。
In order to improve the energy conversion efficiency of dye-sensitized solar cells (DSSCs), deposition of anatase titanium dioxide (TiO2) composite thin films as the negative electrode was attempted using constant-current electrophoresis with a colloidal mixture of two types of TiO2nanoparticles with different sizes and surface properties. The first type was synthesized in the present study and had a size of about 5 nm; these are referred to as TNPs. The second type was commercially obtained TiO2nanoparticles (P25) with a size of about 20 nm. The P25-to-TNP mass ratio was changed during electrophoresis. Because the TNPs were small and the film had a high specific surface area, the film was deposited to minimize the P25-to-TNP mass ratio in the region close to the entrance window of the DSSC. The upper limit of the film thickness was markedly increased compared to deposition in a colloid consisting of one or two kinds of TiO2nanoparticles, but without a particle size gradient. A method for calculating the P25-to-TNP mass ratio, the gradient of the number average particle size, and the specific surface area of thin films with a particle size gradient was proposed. The harvesting efficiency for incident light was improved over a wide wavelength range, and as a result, the energy conversion efficiency of DSSCs fabricated using these thin films was increased.