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    • 1. 发明申请
    • SELF-LIMITED METAL RECESS FOR DEEP TRENCH METAL FILL
    • 自有金属浸渍深层金属镀膜
    • US20050070064A1
    • 2005-03-31
    • US10605362
    • 2003-09-25
    • Nikki EdlemanRichard Wise
    • Nikki EdlemanRichard Wise
    • H01L21/285H01L21/3213H01L21/8242H01L21/8234
    • H01L27/10861H01L21/28568H01L21/32136
    • Disclosed is a method of manufacturing a deep trench capacitor structure that forms a trench in a substrate, lines the trench with a polysilicon liner, and forms titanium nitride columns along the polysilicon liner. The method etches the titanium nitride columns using chlorine-based dry chemistry that is substantially isotropic. This etching process removes the upper portion of the titanium nitride columns without affecting the polysilicon liner. The etching process attacks only in the uppermost portion of the titanium nitride columns such that, after the etching process is completed, the remaining lower portions of the titanium nitride columns are substantially unaffected by the etching process. Then, the method fills the space between the titanium nitride columns and the upper portion of the trench with additional polysilicon material. The process of filling the space simultaneously forms a polysilicon plug and polysilicon cap.
    • 公开了一种制造深沟槽电容器结构的方法,其在衬底中形成沟槽,用多晶硅衬垫对沟槽进行排列,并沿着多晶硅衬垫形成氮化钛柱。 该方法使用基本上各向同性的氯基干化学法蚀刻氮化钛柱。 该蚀刻工艺除去氮化钛柱的上部,而不影响多晶硅衬垫。 蚀刻过程仅在氮化钛柱的最上部进行攻击,使得在蚀刻工艺完成之后,氮化钛柱的其余下部基本上不受蚀刻工艺的影响。 然后,该方法用附加的多晶硅材料填充氮化钛柱和沟槽的上部之间的空间。 同时填充空间的过程形成多晶硅插塞和多晶硅盖。