In this work, we report the preparation of TiO₂ nanoparticles with a high surface area, from 120 to 168 m² g⁻¹ by the hydrothermal-microemulsion route and hydrothermal temperature effect over particle size, porosity, and photovoltaic parameter. The TiO₂ samples were characterized by Raman, BET, TEM, SEM-FE, I–V curves, and EIS. The increase of hydrothermal temperature correlates with particle and pore size. Although when the synthesis temperature was 250 °C, the surface area presents an unexpected decrease of c.a. 28%. TiO₂ samples were employed as thin-film photo-anodes for dye-sensitized solar cell (DSSC) solar cells. Photovoltaic results showed that the sample prepared at 250 °C presented the more suitable textural properties for the DSSC application. The prepared TiO₂ materials with a particle size of 6.93 ± 0.59 nm and anatase crystalline phase favor electron transport and diffusion of electrolyte species, which directly impact in solar cell efficiency.

中文翻译：

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TiO 2的粒径和孔径对DSSC效率的影响

在这项工作中，我们报道了通过水热微乳化途径和水热温度对粒径，孔隙率和光伏参数的影响，制备了表面积从120至168 m ²  g ^-1的TiO ₂纳米粒子。TiO ₂样品通过拉曼光谱，BET，TEM，SEM-FE，IV曲线和EIS进行表征。水热温度的升高与颗粒和孔径有关。尽管当合成温度为250°C时，表面积却出乎意料地降低了约28％。二氧化钛₂样品被用作染料敏化太阳能电池（DSSC）太阳能电池的薄膜光阳极。光伏结果表明，在250°C下制备的样品具有更适合DSSC应用的织构性质。制备的粒径为6.93±0.59nm，锐钛矿晶相的TiO ₂材料有利于电子传递和电解质种类的扩散，直接影响太阳能电池的效率。