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    • 3. 发明授权
    • Post-silicide spacer removal
    • 后硅化物间隔物去除
    • US07393746B2
    • 2008-07-01
    • US11548870
    • 2006-10-12
    • Thomas W. DyerSunfei FangJiang YanSiddhartha PandaYong Meng LeeJunJung Kim
    • Thomas W. DyerSunfei FangJiang YanSiddhartha PandaYong Meng LeeJunJung Kim
    • H01L21/33
    • H01L21/32H01L29/665H01L29/6653H01L29/6656
    • A method forms a gate conductor over a substrate, forms spacers (e.g., nitride spacers) on sides of the gate conductor, and implants an impurity into exposed regions of the substrate not protected by the gate conductor and the spacers. Then the method forms a silicide on surfaces of the exposed regions of the substrate. The method forms a conformal protective layer (e.g., an oxide or other similar material) over the silicide, the spacers, and the gate conductor. Next, the method forms a non-conformal sacrificial layer (e.g., nitride or other material that can be selectively removed with respect to the protective layer) over the protective layer. A subsequent partial etching process partially etches the sacrificial layer such that relatively thinner regions of the sacrificial layer that are over the spacers are completely removed and the relatively thicker regions of the sacrificial layer that are over the substrate are not removed. The next step in the method removes only those portions of the protective layer that cover the spacers, without removing the portions of the protective layer that cover the silicide. As the spacers are now exposed and the silicide is protected by the protective and sacrificial layers, the method can safely remove the spacers without affecting the silicide.
    • 一种方法在衬底上形成栅极导体,在栅极导体的侧面上形成间隔物(例如,氮化物间隔物),并将杂质注入到未被栅极导体和间隔物保护的衬底的暴露区域中。 然后,该方法在衬底的暴露区域的表面上形成硅化物。 该方法在硅化物,间隔物和栅极导体之上形成共形保护层(例如,氧化物或其它类似材料)。 接下来,该方法在保护层上形成非共形牺牲层(例如,可相对于保护层选择性去除的氮化物或其它材料)。 随后的部分蚀刻工艺部分地蚀刻牺牲层,使得在间隔物之上的牺牲层的相对较薄的区域被完全去除,并且除去衬底之上的牺牲层的相对较厚的区域。 该方法中的下一步骤仅去除覆盖间隔物的保护层的那些部分,而不去除覆盖硅化物的保护层的部分。 由于间隔物现在被暴露并且硅化物被保护层和牺牲层保护,所以该方法可以安全地去除间隔物而不影响硅化物。