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反应体系中引入强还原剂抗坏血酸,通过反应条件抑制置换反应,使EDTA银络合溶液优先发生液相还原反应,制备了Cu/Ag核壳金属粉。采用XRD、SEM、EDS、TGA和激光粒度仪等分析手段对所得核壳金属粉的晶相组成、形貌、粒度分布及含量进行分析。结果表明:抗坏血酸还原法经过一次包覆后,在纳米级Cu粉的表面得到包覆完整的Ag层。本工艺得到Cu/30%Ag(质量分数)核壳粉末具有良好的抗氧化性和热稳定性。并将所得Cu/30%Ag核壳金属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,用四探针测试仪测得烧结膜的方阻为12.35 mΩ/□,可满足太阳能电池的电性能要求。
A strong reducing agent, ascorbic acid, was introduced into the reaction system, and the displacement reaction was restrained to make the silver-complexing solution preferentially undergo liquid-phase reduction reaction to prepare Cu / Ag core-shell metal powder. The crystal phase composition, morphology, size distribution and content of the obtained core-shell metal powders were analyzed by XRD, SEM, EDS, TGA and laser particle size analyzer. The results show that the coated Ag layer can be obtained on the surface of nano-sized Cu powder after one coat by ascorbic acid reduction method. The process obtains Cu / 30% Ag (mass fraction) core-shell powder with good oxidation resistance and thermal stability. The obtained Cu / 30% Ag core-shell metal powder was prepared into a slurry for solar cells, screen printed on a silicon wafer and sintered. The square resistance of the sintered film was 12.35 mΩ / □ as measured by a four-probe tester, Can meet the electrical performance requirements of solar cells.