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    • 1. 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。
    • 7. 发明申请
    • THRESHOLD VOLTAGE IMPROVEMENT EMPLOYING FLUORINE IMPLANTATION AND ADJUSTMENT OXIDE LAYER
    • 使用荧光植入和调整氧化层的阈值电压改进
    • US20100289088A1
    • 2010-11-18
    • US12465908
    • 2009-05-14
    • Weipeng LiDae-Gyu ParkMelanie J. SheronyJin-Ping HanYong Meng Lee
    • Weipeng LiDae-Gyu ParkMelanie J. SheronyJin-Ping HanYong Meng Lee
    • H01L27/088H01L21/8236
    • H01L21/823807
    • An epitaxial semiconductor layer may be formed in a first area reserved for p-type field effect transistors. An ion implantation mask layer is formed and patterned to provide an opening in the first area, while blocking at least a second area reserved for n-type field effect transistors. Fluorine is implanted into the opening to form an epitaxial fluorine-doped semiconductor layer and an underlying fluorine-doped semiconductor layer in the first area. A composite gate stack including a high-k gate dielectric layer and an adjustment oxide layer is formed in the first and second area. P-type and n-type field effect transistors (FET's) are formed in the first and second areas, respectively. The epitaxial fluorine-doped semiconductor layer and the underlying fluorine-doped semiconductor layer compensate for the reduction of the decrease in the threshold voltage in the p-FET by the adjustment oxide portion directly above.
    • 可以在为p型场效应晶体管保留的第一区域中形成外延半导体层。 形成离子注入掩模层并图案化以在第一区域中提供开口,同时阻挡至少为n型场效应晶体管保留的第二区域。 将氟注入到开口中以在第一区域中形成外延氟掺杂半导体层和下面的掺氟半导体层。 在第一和第二区域中形成包括高k栅极电介质层和调整氧化物层的复合栅极堆叠。 P型和n型场效应晶体管(FET)分别形成在第一和第二区域中。 外延氟掺杂半导体层和下面的掺氟半导体层通过直接在上面的调整氧化物部分来补偿p-FET中阈值电压的降低。