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    • 52. 发明授权
    • Method of fabricating MIM capacitor with the encapsulated metal structure serving as the lower plate
    • 制造具有封装金属结构的MIM电容器作为下板的方法
    • US06825075B2
    • 2004-11-30
    • US10757214
    • 2004-01-14
    • Kevin S. PetrarcaDonald CanaperiMahadevaiyer KrishnanKenneth Jay SteinRichard P. Volant
    • Kevin S. PetrarcaDonald CanaperiMahadevaiyer KrishnanKenneth Jay SteinRichard P. Volant
    • H01L218242
    • H01L21/76849H01L21/76834H01L21/7684H01L28/60
    • A method is described for fabricating an encapsulated metal structure in a feature formed in a substrate. The sidewalls and bottom of the feature are covered by a barrier layer and the feature is filled with metal, preferably by electroplating. A recess is formed in the metal, and an additional barrier layer is deposited, covering the top surface of the metal and contacting the first barrier layer. The additional barrier layer is planarized, preferably by chemical-mechanical polishing. The method may be used in fabricating a MIM capacitor, with the encapsulated metal structure serving as the lower plate of the capacitor. A second substrate layer is deposited on the top surface of the substrate, with an opening overlying the encapsulated metal structure. A dielectric layer is deposited in the opening, covering the encapsulated metal structure at the bottom thereof. An additional layer, serving as the upper plate of the capacitor, is deposited to cover the dielectric layer and to fill the opening. The dielectric layer and the additional layer are planarized, preferably by CMP.
    • 描述了一种在衬底中形成的特征中制造封装金属结构的方法。 特征的侧壁和底部被阻挡层覆盖,并且该特征被金属填充,优选地通过电镀。 在金属中形成凹部,并且沉积附加的阻挡层,覆盖金属的顶表面并与第一阻挡层接触。 优选通过化学机械抛光将附加阻挡层平坦化。 该方法可用于制造MIM电容器,其中封装的金属结构用作电容器的下板。 第二衬底层沉积在衬底的顶表面上,具有覆盖封装的金属结构的开口。 介电层沉积在开口中,覆盖其底部的封装金属结构。 作为电容器的上板的附加层被沉积以覆盖电介质层并填充开口。 介电层和附加层优选通过CMP平坦化。
    • 60. 发明授权
    • Method of fabricating micro-electromechanical switches on CMOS compatible substrates
    • 在CMOS兼容基板上制造微机电开关的方法
    • US06798029B2
    • 2004-09-28
    • US10434999
    • 2003-05-09
    • Richard P. VolantJohn C. BissonDonna R. CoteTimothy J. DaltonRobert A. GrovesKevin S. PetrarcaKenneth J. SteinSeshadri Subbanna
    • Richard P. VolantJohn C. BissonDonna R. CoteTimothy J. DaltonRobert A. GrovesKevin S. PetrarcaKenneth J. SteinSeshadri Subbanna
    • H01L2982
    • H01H59/0009H01H2059/0018H01H2059/0072
    • A method of fabricating micro-electromechanical switches (MEMS) integrated with conventional semiconductor interconnect levels, using compatible processes and materials is described. The method is based upon fabricating a capacitive switch that is easily modified to produce various configurations for contact switching and any number of metal-dielectric-metal switches. The process starts with a copper damascene interconnect layer, made of metal conductors inlaid in a dielectric. All or portions of the copper interconnects are recessed to a degree sufficient to provide a capacitive air gap when the switch is in the closed state, as well as provide space for a protective layer of, e.g., Ta/TaN. The metal structures defined within the area specified for the switch act as actuator electrodes to pull down the movable beam and provide one or more paths for the switched signal to traverse. The advantage of an air gap is that air is not subject to charge storage or trapping that can cause reliability and voltage drift problems. Instead of recessing the electrodes to provide a gap, one may just add dielectric on or around the electrode. The next layer is another dielectric layer which is deposited to the desired thickness of the gap formed between the lower electrodes and the moveable beam that forms the switching device. Vias are fabricated through this dielectric to provide connections between the metal interconnect layer and the next metal layer which will also contain the switchable beam. The via layer is then patterned and etched to provide a cavity area which contains the lower activation electrodes as well as the signal paths. The cavity is then back-filled with a sacrificial release material. This release material is then planarized with the top of the dielectric, thereby providing a planar surface upon which the beam layer is constructed.
    • 描述了使用兼容工艺和材料制造与常规半导体互连级别集成的微机电开关(MEMS)的方法。 该方法基于制造容易修改以产生用于接触切换和任何数量的金属 - 介电金属开关的各种配置的电容开关。 该过程开始于铜镶嵌互连层,由金属导体嵌入电介质中。 铜互连的全部或部分凹陷到足以在开关处于闭合状态时提供电容气隙的程度,并为例如Ta / TaN的保护层提供空间。 在为开关指定的区域内限定的金属结构用作致动器电极以下拉可移动光束并且提供一个或多个路径用于开关信号横越。 气隙的优点是空气不会受到可能导致可靠性和电压漂移问题的电荷储存或捕集。 代替使电极凹陷以提供间隙,可以仅在电极上或周围添加电介质。 下一层是另一介质层,其被沉积到形成在下电极和形成开关器件的可移动梁之间的间隙的期望厚度上。 通过该电介质制造通孔以提供金属互连层和还包含可切换光束的下一个金属层之间的连接。 然后对通孔层进行图案化和蚀刻以提供包含下部激活电极以及信号路径的空腔区域。 然后用牺牲脱模材料填充空腔。 然后将该释放材料与电介质的顶部平坦化,由此提供构造波束层的平坦表面。