下转换发光粉体SrAl_2O_4:Eu^(2+),Dy^(3+)在硅太阳能电池中的应用

Enhancing the performance of silicon solar cells by incorporation of down-converting SrAl_2O_4:Eu^(2+),Dy^(3+) phosphors

采用化学共沉淀法结合水热处理方法制备了颗粒尺寸约为40 nm的发光粉体SrAl2O4:Eu2+,Dy3+。荧光光谱测试显示,该粉体在受到250～450 nm紫外光激发后可发射出约510 nm的可见光,且发射光与激发光强接近,因此该粉体具有下转换功能特性。将质量分数10%的SrAl2O4:Eu2+,Dy3+与聚甲基丙烯酸甲酯(PMMA)在N,N-二甲基甲酰胺溶剂中充分混合后,采用丝网印刷技术将其涂覆于市售硅太阳能电池板上形成覆盖下转换薄膜的太阳能电池,对涂覆和未涂覆下转换材料的太阳能电池进行了光电性能测试,结果表明涂覆下转换材料的太阳能电池的开路电压和短路电流均得到提高,并且电池的光电转化效率从7.96%提高至8.96%,提高了1%。

SrAl2O4：Eu^2＋,Dy^3＋ phosphors with a particle size of 40 nm have been synthesized via chemical co- precipitation followed by hydrothermal treatment. Their excitation and emission spectra demonstrated that they can be excited by ultraviolet light from 250 nm to 450 nm, and emit 510 nm visible light whose intensity was close to that of the exciting radiation. After mixing phosphors （ mass fraction 10% ） with a solution of polymethyl methacrylate in HCON（CH3）2, the mixture was then screen-printed on top of commercially available silicon solar cells to form down-converting films. The photocurrent -voltage characteristics of cells with and without films were measured. The experimental results revealed that after incorporating the film both the short circuit current （J,c） and open cir- cuit voltage （Voc） increased, and an enhancement of 1% （from 7.96% to 8.96% ） in power conversion efficiency （η） of the Si solar cell was achieved.