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    • 9. 发明授权
    • Ammoniacal alkaline cupric etchant solution for and method of reducing
etchant undercut
    • 氨基碱性蚀刻剂溶液和减少蚀刻剂底切的方法
    • US4319955A
    • 1982-03-16
    • US204216
    • 1980-11-05
    • Kenneth J. Murski
    • Kenneth J. Murski
    • C23F1/34H05K3/06B44C1/22C23F1/00
    • C23F1/34H05K3/067
    • An improved ammoniacal alkaline etchant solution and method of reducing etchant undercut for use in etching copper and copper-containing alloy traces on substrates having resist-coated areas and non-coated areas, which reduces the amount of undercutting beneath the resist-coated areas that lie above the copper traces. The improved etchant solution contains an organic undercut inhibitor which can be either 5-nitro-1H indazole or pyrazole and the improved method includes the step of incorporating said organic undercut inhibitor in a standard ammoniacal alkaline cupric etchant solution. The organic undercut inhibitor causes the formation of a bath-insoluble, physically weak, etch-resistant film on the copper substrate. Said film serves to protect the side walls of an etched depression and thereby diminishes undercutting.
    • 一种改进的氨基碱性蚀刻剂溶液和减少蚀刻剂底切的方法,用于在具有抗蚀剂涂覆区域和非涂覆区域的基底上蚀刻含铜和含铜合金迹线,这减少了在抗蚀剂涂覆区域下方的底切量 铜线以上。 改进的蚀刻剂溶液含有可以是5-硝基-1H-吲唑或吡唑的有机底切抑制剂,并且改进的方法包括将所述有机底切抑制剂掺入标准氨基碱性蚀刻剂溶液中的步骤。 有机底切抑制剂导致在铜基底上形成浴不溶性,物理上弱的耐蚀刻膜。 所述膜用于保护蚀刻凹陷的侧壁,从而减少底切。