研究了宏观整平剂、微观整平剂及电流密度对铜微凸点表面平整性的影响,探讨了2种整平剂和电流密度对铜微凸点表面的作用机制.镀液组成和工艺参数为:CuSO475 g/L,H2SO4100 g/L,Cl-50 mg/L,整平剂H和W0～10 mg/L,(25±2)℃,60 r/min,1～8A/dm2,35 min.结果表明,宏观整平剂可促进铜的沉积,微观整平剂则可抑制铜的沉积,二者相互配合可改变电镀过程中镀孔的电力线分布,使电流密度分布均匀.在一定范围内提高电流密度可加快铜微凸点的生长.在6 A/dm2下,2种整平剂的质量浓度均为5 mg/L时,可制得结晶细腻、表面平整的铜微凸点.
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