Method and structure for reduction of contact resistance of metal silicides using a metal-germanium alloy
    41.
    发明授权
    Method and structure for reduction of contact resistance of metal silicides using a metal-germanium alloy 有权
    使用金属锗合金降低金属硅化物的接触电阻的方法和结构

    公开(公告)号:US06753606B2

    公开(公告)日:2004-06-22

    申请号:US09994954

    申请日:2001-11-27

    IPC分类号: H01L2348

    CPC分类号: H01L21/28518

    摘要: A method of reducing the contact resistance of metal silicides to the p+ silicon area or the n+ silicon area of the substrate comprising: (a) forming a metal germanium (Ge) layer over a silicon-containing substrate, wherein said metal is selected from the group consisting of Co, Ti, Ni and mixtures thereof; (b) optionally forming an oxygen barrier layer over said metal germanium layer; (c) annealing said metal germanium layer at a temperature which is effective in converting at least a portion thereof into a substantially non-etchable metal silicide layer, while forming a Si—Ge interlayer between said silicon-containing substrate and said substantially non-etchable metal silicide layer; and (d) removing said optional oxygen barrier layer and any remaining alloy layer. When a Co or Ti alloy is employed, e.g., Co—Ge or Ti—Ge, two annealing steps are required to provide the lowest resistance phase of those metals, whereas, when Ni is employed, a single annealing step forms the lowest resistance phase of Ni silicide.

    摘要翻译: 一种降低金属硅化物与衬底的p +硅区域或n +硅区域的接触电阻的方法,包括:(a)在含硅衬底上形成金属锗(Ge)层,其中所述金属选自 由Co,Ti,Ni及其混合物组成的组; (b)任选地在所述金属锗层上形成氧阻隔层; (c)在有效地将其至少一部分转化成基本上不可蚀刻的金属硅化物层的温度下退火所述金属锗层,同时在所述含硅衬底和所述基本上不可蚀刻的衬底之间形成Si-Ge中间层 金属硅化物层; 和(d)去除所述任选的氧气阻挡层和任何剩余的合金层。 当使用Co或Ti合金时,例如Co-Ge或Ti-Ge,需要两个退火步骤来提供这些金属的最低电阻相,而在使用Ni时,单个退火步骤形成最低的电阻相 的Ni硅化物。

    Method for increasing the capacitance of a trench capacitor
    43.
    发明授权
    Method for increasing the capacitance of a trench capacitor 失效
    增加沟槽电容器电容的方法

    公开(公告)号:US06448131B1

    公开(公告)日:2002-09-10

    申请号:US09929182

    申请日:2001-08-14

    IPC分类号: H01L218242

    摘要: A method for increasing the trench capacitor surface area is provided. The method, which utilizes a metal silicide to roughen the trench walls, increases capacitance due to the increase in the trench surface area after the silicide has been removed. The roughening of the trench walls can be controlled by varying one or more of the following parameters: the density of the metal, the metal film thickness, the silicide phase, and the choice of the metal. Once the metal is deposited in the trench, the method is self-limited. Shrinking the trench to its original width can be obtained by subsequent silicon deposition or by diffusion of silicon from a cap layer through the silicide.

    摘要翻译: 提供了一种用于增加沟槽电容器表面积的方法。 利用金属硅化物粗糙化沟槽壁的方法由于硅化物被去除之后的沟槽表面积的增加而增加了电容。 可以通过改变一个或多个以下参数来控制沟槽壁的粗糙化:金属的密度,金属膜厚度,硅化物相以及金属的选择。 一旦金属沉积在沟槽中,该方法是自限制的。 通过随后的硅沉积或通过硅化物从盖层扩散硅可以获得将沟槽缩小至原始宽度。

    Method and structure for reduction of contact resistance of metal silicides using a metal-germanium alloy
    48.
    发明授权
    Method and structure for reduction of contact resistance of metal silicides using a metal-germanium alloy 失效
    使用金属锗合金降低金属硅化物的接触电阻的方法和结构

    公开(公告)号:US06331486B1

    公开(公告)日:2001-12-18

    申请号:US09519897

    申请日:2000-03-06

    IPC分类号: H01L244

    CPC分类号: H01L21/28518

    摘要: A method of reducing contact resistance of metal silicides to a silicon-containing substrate is provided. The method includes first forming a metal germanium layer over a silicon-containing substrate. An optionally oxygen barrier layer may be formed over the metal germanium layer. Next, the structure containing the metal germanium layer is annealed at a temperature effective in converting at least a portion of the metal germanium layer into a substantially non-etchable metal silicide layer, while forming a Si-Ge interlayer between the substrate and the silicide layer. After annealing, the optional oxygen barrier layer and any remaining metal germanium layer is removed from the substrate.

    摘要翻译: 提供了一种降低金属硅化物与含硅衬底的接触电阻的方法。 该方法包括首先在含硅衬底上形成金属锗层。 可以在金属锗层上形成任选的氧阻挡层。 接下来,含有金属锗层的结构在有效地将金属锗层的至少一部分转化为基本上不可蚀刻的金属硅化物层的同时,在衬底和硅化物层之间形成Si-Ge中间层的温度下进行退火 。 在退火之后,从衬底去除可选的氧阻挡层和任何剩余的金属锗层。

    Method for self-aligned formation of silicide contacts using metal silicon alloys for limited silicon consumption and for reduction of bridging
    49.
    发明授权
    Method for self-aligned formation of silicide contacts using metal silicon alloys for limited silicon consumption and for reduction of bridging 有权
    使用金属硅合金自发对准形成硅化物接触的方法,用于有限的硅消耗和减少桥接

    公开(公告)号:US06323130B1

    公开(公告)日:2001-11-27

    申请号:US09515033

    申请日:2000-03-06

    IPC分类号: H01L2144

    CPC分类号: H01L29/665 H01L21/28518

    摘要: A method of substantially reducing Si consumption and bridging during metal silicide contact formation comprising the steps of: (a) forming a metal silicon alloy layer over a silicon-containing substrate containing an electronic device to be electrically contacted, said silicon in said alloy layer being less than about 30 atomic % and said metal is Co, Ni or mixtures thereof; (b) annealing said metal silicon alloy layer at a temperature of from about 300° to about 500° C. so as to form a metal rich silicide layer that is substantially non-etchable compared to said metal silicon alloy or pure metal; (c) selectively removing any non-reacted metal silicon alloy over non-silicon regions; and (d) annealing said metal rich silicide layer under conditions effective in forming a metal silicide phase that is in its lowest resistance phase. An optional oxygen barrier layer may be formed over the metal silicon alloy layer prior to annealing step (b).

    摘要翻译: 一种在金属硅化物接触形成期间显着降低Si消耗和桥接的方法,包括以下步骤:(a)在含有电接触的电子器件的含硅衬底上形成金属硅合金层,所述合金层中的所述硅为 小于约30原子%,所述金属为Co,Ni或其混合物; (b)在约300℃至约500℃的温度下退火所述金属硅合金层,以便与所述金属硅合金或纯金属相比形成基本不可蚀刻的富金属硅化物层; (c)在非硅区域上有选择地去除任何未反应的金属硅合金; 和(d)在有效形成处于其最低电阻相的金属硅化物相的条件下退火所述富金属硅化物层。 可以在退火步骤(b)之前在金属硅合金层上形成任选的氧阻挡层。