聚乙二醇共水热合成TiO_2纳米晶多孔薄膜

Sythesis of TiO_2 Nanocrystalline Nanoporous Films with Polyethylene Glycol in Hydrothermal Reaction

以钛酸丁酯为原料,在水热过程中加入聚乙二醇(分子量2 000)合成TiO2纳米晶,并制备多孔薄膜用于染料敏化太阳能电池(DSSCs)。采用X射线衍射仪(XRD)、扫描电子显微镜(SEM)、台阶仪、紫外-可见分光光度计(UV-vis)对纳米晶粒的晶体结构、薄膜的表面形貌、厚度和光学吸收性能以及电池的光电能量转换性能随聚乙二醇的加入量变化的规律进行了探索。结果表明,聚乙二醇的加入抑制了锐钛矿相TiO2晶粒的生长,诱导了金红石相的形成。当聚乙二醇的加入量为TiO2质量的5%时性能达到最佳,采用单层多孔薄膜以及不添加四-叔丁基吡啶的电解质组装的电池获得了2.86%的光电能量转换效率。

TiO2 nanocrystallines were prepared by hydrothermal reaction using tetrabutyl titanate as the starting material and poly（ethylene glycol）（PEG,MW=2 000） as the additive.TiO2 nanoporous thin films were fabricated using the synthesized nanocrystallines and used to assemble dye-sensitized solar cells.The crystallographic structure of the nanocrystalline was characterized by X-ray diffraction,while the thickness,surface morphology and optical properties of the films were studied by scanning electron microscopy,profiler measuring system and UV-vis spectroscopy respectively.The photovoltaic performance of the solar cells was studied.The influence of addition of PEG on the crystallite structure and average crystal size was analyzed.It was found that the growth of the anatase nanocrystallines was inhibited by PEG.When the content of PEG is about 5% of TiO2,the rutile appears,and the best photo-to-electric energy conversion efficiency of 2.86% is reached using liquid state electrolyte without 4-tert-pyridine.