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US5972722A Adhesion promoting sacrificial etch stop layer in advanced capacitor structures 失效
先进的电容器结构中的粘附促进牺牲蚀刻停止层

Adhesion promoting sacrificial etch stop layer in advanced capacitor
structures
摘要:
A high-k dielectric capacitor structure and fabrication method that incorporates an adhesion promoting etch stop layer 200 to promote adhesion of the bottom electrode 220 to the interlevel dielectric layer 210 and to provide a well controlled, repeatable and uniform recess prior to the dielectric 230 deposition. By using a sacrificial layer 200, for example silicon nitride (Si3N4), this layer can act as an etch stop during the recess etch to eliminate parasitic capacitance between adjacent capacitor cells A and B and can promote adhesion of the bottom electrode material 220 to the substrate 210.
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