太阳能电池浆料用亚微米球形银粉的制备工艺研究

发布时间：2019-01-01 13:41

【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。
[Abstract]:Sub-micron spherical silver powder was prepared by liquid phase reduction with ascorbic acid as reducing agent, AgNO3 as silver salt and polyethylene glycol 4000 (PEG-4000) as dispersant. The effects of ascorbic acid concentration, dispersant addition method and solution pH value on the particle size of silver powder were investigated by L9 (33) orthogonal design. The optimum conditions for the preparation of submicron spherical silver powder were obtained as follows: the concentration of pH=5,AgNO3 was 0.5 mol/L,AgNO3, the concentration of ascorbic acid was 0.9 mol/L, and the concentration of ascorbic acid was 0.9 mol/L,. PEG-4000/AgNO3 (mass ratio) is 1.2 and reaction temperature is room temperature. The results of laser particle size analyzer, XRD and SEM showed that the silver powder prepared under the optimum experimental conditions was pure, uniform in size distribution and spherical in shape. The silver powder obtained under the optimized conditions is modulated into the paste used for solar cells, which is printed on the silicon wafer and sintered by screen. The surface resistance of the sintered film silver grid line is 0.721 m / -, which can meet the electrical performance requirements of the solar cell.
【作者单位】：昆明理工大学;昆明理工恒达科技有限公司;
【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)
【分类号】：TM914.4;TF123.2

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