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    • 33. 发明授权
    • Metallization process for a semiconductor device
    • 半导体器件的金属化工艺
    • US5444018A
    • 1995-08-22
    • US135863
    • 1993-10-13
    • Dennis J. YostThomas D. BonifieldRoc Blumenthal
    • Dennis J. YostThomas D. BonifieldRoc Blumenthal
    • H01L21/28H01L21/285H01L21/768H01L23/522H01L21/441
    • H01L21/28512H01L21/76895H01L2924/0002
    • A contact for a semiconductor device has a via extending through a dielectric and collimated titanium in the via. Depositing titanium by collimation places sufficient metal into high aspect ratio contacts to make good electrical connection. The collimated titanium may be reacted in a nitrogen containing ambient to form a titanium silicide layer at the bottom of the contact and a titanium nitride layer over the titanium silicide layer. The titanium silicide layer provides good electrical contact to a device in a silicon semiconductor substrate and lowers contact resistance. Tungsten may be deposited over the colliminated titanium to form a conductor layer. The titanium nitride layer provides a sticking layer for the tungsten. The contact structure and the method are useful in high aspect ratio contacts present in VLSI multilevel interconnected devices such as dynamic random access memories.
    • 用于半导体器件的触点具有延伸穿过通孔中的电介质和准直钛的通孔。 通过准直沉积钛将足够的金属置入高纵横比触点,以实现良好的电连接。 准直的钛可以在含氮环境中反应以在接触的底部形成硅化钛层,并且在钛硅化物层上方形成氮化钛层。 硅化钛层与硅半导体衬底中的器件提供良好的电接触并降低接触电阻。 钨可以沉积在准直钛上以形成导体层。 氮化钛层为钨提供粘附层。 接触结构和方法对于存在于VLSI多级互连设备(例如动态随机存取存储器)中的高纵横比触点是有用的。