TiO_2/Eu^(3+),Y^(3+)下转换薄膜的制备及其在染料敏化太阳能电池中的应用

The Preparation of TiO_2/Eu^(3+),Y^(3+) Down-conversion Film and Its Application in Dye-sensitized Solar Cells

采用溶胶-凝胶法制备了TiO2/Eu3+,Y3+下转换薄膜,将其应用到染料敏化太阳能电池中,利用其下转换特性将紫外光转换为可见光,提高了电池的可见光照强度.利用X射线衍射和荧光光谱对TiO2/Eu3+,Y3+粉体进行表征,利用荧光光谱和紫外-可见分光光度计对TiO2/Eu3+,Y3+下转换薄膜进行测试,荧光光谱显示,下转换薄膜受到396nm紫外光照射时可发射出535~620nm连续波长的可见光,具有下转换功能特性.与TiO2薄膜相比,二层下转换薄膜仍能保持较高的可见光透过率.当稀土元素总掺量为4%时,利用下转换特性使短路电流提高了21.5%,光电转换效率提高了14.1%.

TiO2/Eu^3＋ ,Y^3＋ down-conversion film was prepared by Sol-Gel method and applicated in dye- sensitized solar cells. Ultraviolet light converted to visible light by down-conversion feature to improve the visible light intensity of dye-sensitized solar cells. TiO2/Eu^3＋ , Y^3＋ powder were characterized by the X-ray diffraction and fluorescence spectroscopy, the TiO2/Eu^3＋ , y3＋ down-conversion film were tested by the fluorescence spectroscopy and ultraviolet-visible spectrophotometer. Exposed to 396 nm ultraviolet light, down-conversion film could emit 535 - 620 nm wavelength visible light which showed a down- conversion features of the film. Bilayer down-conversion film still kept a higher visible light transmittance compared with a single phase TiO2 film. When total rare earth content is 4%, short circuit current is increased by 21.5% and photoelectric conversion efficiency by 14.1% with down-conversion feature of TiO2/Eu^3＋ ,Y^3＋ film.