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    • 4. 发明申请
    • Metal insulator metal (MIM) capacitor fabrication with sidewall barrier removal aspect
    • 金属绝缘体金属(MIM)电容器制造与侧壁屏障去除方面
    • US20060024902A1
    • 2006-02-02
    • US10903712
    • 2004-07-30
    • Sameer AjmeraDarius CrenshawStephan GrunowSatyavolu Papa RaoPhillip Matz
    • Sameer AjmeraDarius CrenshawStephan GrunowSatyavolu Papa RaoPhillip Matz
    • H01L21/20
    • H01L28/75
    • A method (10) of forming a MIM (metal insulator metal) capacitor is disclosed whereby adverse affects associated with copper diffusion are mitigated even as the capacitor is scaled down. A layer of bottom electrode/copper diffusion barrier material (136) is formed (16) within an aperture (128) wherein the capacitor (100) is to be defined. The bottom electrode layer (136) is formed via a directional process so that a horizontal aspect (138) of the layer (136) is formed over a metal (110) at a bottom of the aperture (128) to a thickness (142) that is greater than a thickness (144) of a sidewall aspect (148) of the layer (136) formed upon sidewalls (132) of the aperture (128). Accordingly, the thinner sidewall aspects (148) are removed during an etching act (18) while some of the thicker horizontal aspect (138) remains. A layer of capacitor dielectric material (150) is then conformally formed (20) into the aperture 128 and over the horizontal aspect (138). A layer of top electrode material (152) is then conformally formed (22) over the layer of capacitor dielectric material (150) to complete the capacitor stack (154).
    • 公开了形成MIM(金属绝缘金属)电容器的方法(10),其中即使电容器按比例缩小,也减轻了与铜扩散相关的不利影响。 一层底部电极/铜扩散阻挡材料(136)在其中限定电容器(100)的孔(128)内形成(16)。 底部电极层(136)通过定向工艺形成,使得层(136)的水平方面(138)形成在孔(128)底部的金属(110)上至厚度(142) 大于形成在孔(128)的侧壁(132)上的层(136)的侧壁方面(148)的厚度(144)。 因此,在蚀刻行为(18)期间移除较薄的侧壁方面(148),而较厚的水平方面(138)中的一些保留。 然后将一层电容器电介质材料(150)保形地形成(20)到孔128中并且在水平方面(138)上。 然后在电容器介电材料(150)的层上共形形成(22)顶层电极材料层(152)以完成电容器堆叠(154)。