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    • 3. 发明申请
    • STABILIZED SURFACE BETWEEN A FLUOROSILICATE GLASS DIELECTRIC AND A LINER/BARRIER LAYER
    • 氟硅酸盐玻璃介质与衬里/隔离层之间的稳定表面
    • WO0213234A3
    • 2002-08-01
    • PCT/US0124177
    • 2001-07-31
    • APPLIED MATERIALS INC
    • MOGHADAM FARHADTRIBULA DANAM SAAD HICHEMKRISHNA NETY MMAITY NIRMALYA
    • H01L21/768
    • H01L21/76855H01L21/76802H01L21/76807H01L21/76814H01L21/76826H01L21/76843
    • A method of stabilizing a fluorosilicate glass (FSG) (36, 40) used as an inter-level dielectric layer and having via or other holes (42, 44) formed therethrough for contacting an aluminium or copper metallization. The FSG layer including the hole is subjected first to a plasma of nitrogen and possibly hydrogen and then to an argon plasma. The nitrogen plasma creates a nitrogen-rich surface, which reacts with the after deposited titanium to form a thin stable TiN layer. The nitrogen plasma may be applied at relatively low power. The hydrogen plasma removes free fluorine in the FSG which can create problems with peeling. The hydrogen/nitrogen may be supplied in the form of forming gas containing less than 7 % hydrogen. The subsequent argon plasma cleans the surface, including possibly removing a nitrided aluminium surface formed by the nitrogen plasma from an aluminium metallization. The process may also be applied to a copper dual-damascene metallization. After the two plasma treatments, a liner/barrier layer, preferably of Ti/TiN for Al and Ta/TaN for Cu, is coated on the walls of the hole and over the top of the FSG layer, and a metal is deposited in the hole to fill it.
    • 一种稳定氟硅酸盐玻璃(FSG)(36,40)的方法,所述氟硅酸盐玻璃(36,40)用作层间电介质层并具有穿过其中形成的通孔或其他孔(42,44)以接触铝或铜金属化层。 包含该孔的FSG层首先经受氮等离子体和可能的氢,然后经受氩等离子体。 氮等离子体产生富氮表面,其与后沉积的钛反应形成薄而稳定的TiN层。 氮等离子体可以以相对较低的功率施加。 氢等离子去除FSG中的游离氟,这可能产生剥离问题。 氢/氮可以以含有少于7%的氢的形成气体的形式供应。 随后的氩等离子体清洁表面,包括可能从铝金属化层去除由氮等离子体形成的氮化铝表面。 该工艺也可以应用于铜双金属镶嵌金属化。 在两次等离子体处理之后,衬里/阻挡层,优选用于Al的Ti / TiN和用于Cu的Ta / TaN被涂覆在孔的壁上和FSG层的顶部上,并且金属沉积在 孔来填充它。