分级微纳结构ZnO空心球的制备及其光电转换性能

Preparation of Hollow ZnO Spheres with Hierarchical Micro/Nano Architectures and Photoelectric Conversion Property

以醋酸锌为锌源,二甘醇为溶剂,通过一种改进的溶剂热法制备出具有分级微纳结构的ZnO空心球。X射线衍射(XRD),扫描电子显微术(SEM),N2吸附脱附等表征结果显示此ZnO材料的初级结构为纳米颗粒,次级结构为该纳米颗粒构筑的微米级多分散小球。聚焦离子束(FIB)切割实验表明,小球内部为中空结构。这种新颖的复合结构应用于染料敏化太阳电池(DSSC)领域,有两大优势:其初级结构提供了大的比表面以吸附更多染料分子,同时其次级结构和孔结构可以起到光散射中心的作用,提高光的利用率,从而最终提高了电池的光电转换效率。

Hollow ZnO spheres with hierarchical micro/nanoarchitectures were prepared by a modified solvothermal method using zinc acetate as zinc source and diethylene glycol as solvent. X-ray diffraction （XRD）, scanning electron microscope （SEM） and N2 adsorptiondesorption show that they are polydisperse microspheres consisting of many primary nanoparticles. Hollow structures can be observed when a sphere is split by focused ion beam （FIB）. The application of this novel complex architecture to dye-sensitized solar cell （DSSC） leads to two benefits： the secondary structures can function as light scattering centers, while primary structures provide large surface area.