采用十二烷基苯磺酸钠表面活性剂(DBS)辅助水热法合成TiO2纳米材料, XRD和TEM测试表明, 不含DBS的TiO2溶胶水热处理后得到10~20nm锐钛矿型TiO2纳米颗粒; 添加DBS后, 生成了金红石型TiO2纳米棒. 虽然金红石型TiO2纳米棒光电极的染料吸附性能和光电性能均不如锐钛矿型TiO2纳米颗粒光电极, 但金红石型TiO2纳米棒漫反射性能较高. 可用其制备具有光电转换性能的反射层, 这种新型反射层使染料敏化太阳能电池光电转换效率提高了26.14%, 而含Ti-nanoxide 300大颗粒TiO2构成的反射层仅能使电池光电转换效率提高11.04%. 这种差异的根源在于金红石型TiO2纳米棒不仅具有散射光能力, 其本身还可吸附染料进行光电转换. 随着反射层厚度的增加, 电池短路电流逐步提高. 而不吸附染料且无光电转换能力的Ti-nanoxide 300传统反射层则没有这种功能.
The sodiumdodecyl benzene sulfate (DBS) surfactant was used in the hydrothermal synthesisof TiO2 nanomaterials. Without the addition of DBS in the TiO2 Sol,theobtained sample is 10~20nm anatase TiO2 nanoparticle. While with the additionof DBS, the obtained sample turns to rutile TiO2 nanorod. Althoughthe dye adsorption ability and the photovoltaic performance of thephotoelectrode with rutile TiO2 nanorod is poorer than that of thephotoelectrode with anatase TiO2 nanoparticle, the rutile TiO2nanorod has higher light scattering ability. When using the rutile TiO2nanorod in the fabrication of the reflecting layer in the photoelectrode, thelayer can reflect light and convert energy. This new kind of reflecting layerin the photoelectrode shows higher efficiency in enhancing the energy conversionefficiency of dye-sensitized solar cell (with 26.14% enhancement) than that oftraditional Ti-nanoxide 300 reflecting layer (with 11.04% enhancement). Thereason is that the double functions of rutile TiO2 nanorod reflectinglayer are superior than that of traditional Ti-nanoxide 300 reflecting layer inenhancing the short-circuit current density of dye-sensitized solar cell.
参考文献
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