太阳能电池浆料用亚微米球形银粉的制备工艺研究  

Preparation of Sub-micron Spherical Silver Powders for Solar Cell Paste

作　　者：黄惠[1] 赖耀斌[1] 付仁春[1] 陈步明[1] 郭忠诚[1,2] 

机构地区：[1]昆明理工大学,云南昆明650093 [2]昆明理工恒达科技有限公司,云南昆明650106

出　　处：《稀有金属材料与工程》2014年第6期1497-1501,共5页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(50974065;51004057);云南省自然科学基金(2011FZ031);昆明理工大学分析测试基金(2010198)

摘　　要：以抗坏血酸为还原剂,AgNO3为银盐,聚乙二醇4000(PEG-4000)为分散剂,采用液相还原法制备亚微米球形银粉。采用L9(33)正交试验设计,考察抗坏血酸浓度、分散剂加入方式以及溶液pH值对银粉粒度的影响。分析得出制备亚微米球形银粉的优化条件为:pH=5,AgNO3浓度为0.5 mol/L,AgNO3和抗坏血酸溶液中分别加入一半分散剂,抗坏血酸的浓度为0.9 mol/L,PEG-4000/AgNO3(质量比)为1.2,反应温度为室温。通过激光粒度仪、XRD及SEM表征,表明在较优实验条件下制备的亚微米级银粉纯净,粒度分布均匀,呈球状。并将优化条件下所得银粉调制成太阳能电池用浆料,通过丝网印刷在硅片上并烧结,烧结膜银栅线的表面方阻为0.721 m/□,可满足太阳能电池的电性能要求。Using ascorbic acid as a reducing agent, AgNO3 as silver salts and polyethylene glycol 4000（PEG-4000） as dispersant, sub-micron spherical silver powders were prepared by a liquid-phase reduction method. By means of the orthogonal design of three factors and three levels, the effects of the following factors on the particles size of silver powders were studied, including the concentration of ascorbic acid, the way of dispersant addition into solution and the pH value of the solution. The optimized preparation conditions of sub-micron spherical silver powders were obtained. The sub-micron spherical silver powders could be synthesized under the conditions of pH=5, AgNO3 concentration of 0.5 mol/L, adding half of the dispersant to the AgNO3 and ascorbic acid solution, C6H806 concentration of 0.9 mol/L, PEG-4000/AgNO3 mass ratio of 1.2 and at room temperature. The sub-micron spherical silver powders were characterized by laser particle distribution analyzer, SEM and XRD. The results show that the prepared silver powders are pure, with uniform particle size distribution and spherical shape under optimized experiment conditions. The paste prepared with the obtained silver powders was printed on the silicon, and the square resistance of the sintered film is 0.721 mΩ/□, indicating the electrical property of the prepared silver is qualified for solar cells

关 键 词：化学还原法 球形银粉 正交设计 太阳能电池 浆料 

分 类 号：TM914.4[电气工程—电力电子与电力传动] TF123.2[冶金工程—粉末冶金]