银粉对硅太阳电池正银电极性能的影响  

EFFECTS OF SILVER POWDER ON PROPERTIES OF FRONT-SIDE AG CONTACTS FOR SILICON SOLAR CELLS

作　　者：李宏勇[1] 付明[1] 王玥[1] 范琳 陈栋 丰昭 

机构地区：[1]华中科技大学光学与电子信息学院,武汉430074 [2]武汉优乐光电科技有限公司,武汉430206

出　　处：《太阳能学报》2017年第1期206-211,共6页Acta Energiae Solaris Sinica

基　　金：武汉市科技局应用基础研究项目(2014010101010022)

摘　　要：利用不同性能的银粉配制正银浆料,通过丝网印刷、烧结工艺制作硅太阳电池,研究银粉粒径、形貌和结晶性等对硅太阳电池正银的丝网印刷性能和电池转换效率等性能的影响。用扫描电镜(SEM)分析正银栅线电极的微观结构及烧结后Ag-Si界面处银微晶的形成情况。结果表明,银粉粒径和形貌对栅线电极的高-宽比和电极致密性有直接影响;Ag-Si界面处的银微晶大小和数量是正银电极形成欧姆接触的关键。利用正银电极的烧结原理,分析不同银粉对正银电极欧姆接触形成的影响,粒径为1.47μm的球形银粉,有较高的振实密度和烧结活性,制备的电池转换效率较高。The effects of particle size, morphology and crystallinity of silver powder on the printing performance of front silver paste and the electrical properties of front-side Ag contacts are investigated. The effect of silver powder on the conversion efficiency of solar cells is studied by preparing front silver pastes with various silver powders and fabricating solar cells through screen printing and sintering process. The microstrueture of front-side Ag contacts and the Ag crystallite at the Ag-Si interface are analysed by SEM. The results indicate that the size and morphology of silver particles have a great effect on aspect ratio and compactness of the silver grids. The number and size of the silver crystals at the Ag-Si interface are key to the ohmic contact of front-side Ag contacts. The effect of different silver powders on the formation of ohmic contact is analysed using the sintering principle of front-side Ag contacts. As high tap density and sintering activity, the conversion efficiency of solar ceils fabricated using spherical silver powders with size of 1.47 μm is higher.

关 键 词：硅太阳电池 正银电极 微观结构 银微晶 转换效率 

分 类 号：O742.5[理学—晶体学]