Method for forming an inlaid via in a semiconductor device
    1.
    发明授权
    Method for forming an inlaid via in a semiconductor device 失效
    在半导体器件中形成镶嵌通孔的方法

    公开(公告)号:US6054377A

    公开(公告)日:2000-04-25

    申请号:US858109

    申请日:1997-05-19

    摘要: A inlaid interconnect is formed in a semiconductor device (30). A first interlayer dielectric (ILD) 40 is deposited and etched to form a via opening (44). An etchstop layer (42) is deposited on ILD (40). A second ILD (45) is deposited on etchstop layer (42) in a manner so that a pinch-off region (46) is formed to prevent substantial deposition of the ILD material into via opening (44). While a small deposit (47) of ILD material may form within the via opening, this can be easily removed in a subsequent etch of ILD (45) which forms a trench opening (48) in ILD (45). A metal layer (50) is then deposited and polished to form a metal interconnect having a trench portion (52) and a via portion (54) in device (30). The present invention avoids the need for a substantial over-etch to clear the via, and avoids the need to form a thick resist mask to form the via opening, while maintaining a controlled via diameter.

    摘要翻译: 嵌入的互连形成在半导体器件(30)中。 沉积和蚀刻第一层间电介质(ILD)40以形成通孔(44)。 蚀刻阻挡层(42)沉积在ILD(40)上。 第二ILD(45)以这样的方式沉积在蚀刻阻挡层(42)上,使得形成夹断区域(46)以防止ILD材料大量沉积到通孔(44)中。 虽然ILD材料的小沉积物(47)可以在通孔开口内形成,但是在ILD(45)中形成沟槽开口(48)的ILD(45)的后续蚀刻中可以容易地去除这种沉积物(47)。 然后沉积和抛光金属层(50)以形成在器件(30)中具有沟槽部分(52)和通孔部分(54)的金属互连。 本发明避免了实质上过度蚀刻以清除通孔的需要,并避免需要形成厚的抗蚀剂掩模以形成通路孔,同时保持受控的通孔直径。