YVO_4:Eu^(3+)@SiO_2下转换发光特性及其太阳电池应用研究  

Down-conversion Photoluminescence Properties of YVO_4:Eu^(3+)@SiO_2 Core-shell Structures for Solar Cell Applications

作　　者：檀满林[1] 尚旭冉 马清[1] 王晓伟[1] 符冬菊[1] 李冬霜[1] 张维丽[1] 陈建军[1] 张化宇[2] TAN Man-Lin SHANG Xu-Ran MA Qing WANG Xiao-Wei FU Dong-Ju LI Dong-Shuangl ZHANG Wei-Li CHEN Jian-Jun ZHANG Hua-Yu(Research Institute of Ysinghua University in Shenzhen, Shenzhen 518057, China Harbin Institute of Technology Shenz- hen Graduate School, Shenzhen 518055, China)

机构地区：[1]深圳清华大学研究院,深圳518057 [2]哈尔滨工业大学深圳研究生院,深圳518055

出　　处：《无机材料学报》2016年第10期1110-1116,共7页Journal of Inorganic Materials

基　　金：深圳市科技计划项目(CXZZ20150323160924557;JCYJ20140419122040620;JCYJ20160301100700645);广东省科技计划(2014A010106004);国家自然科学基金(51302150)~~

摘　　要：铕掺杂钒酸钇(YVO_4:Eu^(3+))作为常用的下转换发光材料一直受到广泛的关注和研究,但是YVO_4:Eu^(3+)的表面缺陷会严重影响材料的发光效率。为了进一步改善YVO_4:Eu^(3+)纳米粉体材料的粒度分布和形貌特点,在亚微米级别的SiO_2微球表面涂覆一层YVO_4:Eu^(3+),制成YVO_4:Eu^(3+)@SiO_2核–壳结构,得到单分散的球形YVO_4:Eu^(3+)下转换发光材料,实现YVO_4:Eu^(3+)的发光性能和SiO_2球形特性的有机结合。研究发现,当壳核比为0.6时,YVO_4:Eu^(3+)@SiO_2核–壳结构材料的发光强度可达到纯纳米粉体材料发光强度的90%以上。将改性后的YVO_4:Eu^(3+)@SiO_2核–壳结构材料涂覆在硅基薄膜太阳电池上,可使电池的短路电流密度和转化效率分别由6.694 m A/cm^2和9.40%提升至8.417 m A/cm^2和10.15%,增益效果较为明显。实验结果表明,采用溶液法制备的YVO_4:Eu^(3+)@SiO_2纳米粉体材料由于具有形貌规则、团聚小和尺寸分布均匀等特点,可用作硅基薄膜太阳电池下转换发光层材料。Europium ions doped yttrium vanadate （YVO4： Eu^3＋） has excellent emission properties for down-conversion applications. However, the serious surface defects of YVO4： Eu^3＋ hinder the improvement of lumi- nescent efficiency. In order to improve the particle size distribution and morphology of YVO4： Eu^3＋ nano-powders, mono-dispersed spherical YVO4：Eu^3＋@SiO2 core-shell structure materials were prepared by coating a layer of YVO4： Eu^3＋ onto the surface of SiO2 microspheres. With the shell-core ratio setting as 0.6, the luminescence intensity of YVO4 Eu^3＋@SiO2 core-sheU structure composite could reach up to more than 90% of pure YVO4： Eu3＂ nano-powder. Fur- thermore, the prepared YVO4：Eu^3＋@SiO2 core-shell structure films were used as down-conversion materials for amorphous silicon thin film solar cells. The cell parameters such as short current density and photoelectric conversion efficiency increased from original 6.694 mA/cm^2 and 9.40% to 8.417 mA/cm^2 and 10.15%, respectively. Thus YVO4： Eu^3＋@SiO2 core-shell configuration can be fabricated from YVO4： Eu^3＋ and SiO2 microsphere to avoid agglomeration. Eu^3＋ The prepared YVO4： Eu @SiO2 core-shell structures have regular morphology and uniform particle sizes, which are suitable to be used as down-conversion light emitting layer in amorphous silicon solar cells.

关 键 词：钒酸钇 核-壳结构 太阳电池 下转换 

分 类 号：TB303[一般工业技术—材料科学与工程]