碳球模板剂对TiO2光阳极微结构及其光电性能影响研究

以葡萄糖为原料水热合成碳球作为模板剂,将其与TiO2纳米晶共混制备纳米多孔TiO2光阳极。采用场发射电子扫描电镜(SEM)、台阶仪、紫外-可见分光光度计(UV-Vis)等对TiO2薄膜的表面形貌、厚度和散射能力进行表征。研究发现,随着碳球含量的增加,光阳极单位体积内的表面积先增加后减小;薄膜对光的散射能力也呈现同样趋势。采用所制备的光阳极组装染料敏化太阳能电池,性能测试结果表明,随着碳球含量的增加,电池短路电流密度先增加,后减小。当碳球加入量为TiO2纳米晶质量的3%时,电池光电转换效率达到最佳为5.15%。

The effect of carbon spheres used as template on microstructure and photo-electric performance of TiO2 thin film

Carbon spheres were synthesized by hydrothermal reaction using glucose as raw material.The carbon spheres were used as template so as the prepare mesoporous TiO2 thin film which acted as the photoanode of dye sensitized solar cells.Film thickness,surface morphology and scattering ability of the films were studied using profiler,scanning electron microscopy,and UV-Vis spectroscopy respectively.Photovoltaic performance of the cells was evaluated,and the effect of carbon spheres on the cell performance was studied.It was found that with the increase of contents of carbon spheres,surface area in unit volume of the TiO2 film increased at first,and then decreased;similar trend was also observed in the light scattering ability of the TiO2 film.Due to both of the enlarged surface area and the enhanced light scattering ability,photocurrent density of the solar cell and hence the cell performance was optimized,reaching 5.15% at the testing condition.