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    • 41. 发明公开
    • Iridium composite barrier structure and method for same
    • 铱 - Verbundsbarrierestruktur und Verfahren zu deren Herstellung
    • EP1035589A2
    • 2000-09-13
    • EP00301790.2
    • 2000-03-06
    • SHARP KABUSHIKI KAISHASharp Laboratories of America, Inc.
    • Zhang, FengyanMaa, Jer-ShenHsu, Sheng Teng
    • H01L29/45H01L21/28
    • H01L28/75H01L21/28291H01L28/55H01L29/516
    • An Ir combination film has been provided that is useful in forming an electrode of a ferroelectric capacitor. The combination film includes tantalum and oxygen, as well as iridium. The Ir combination film effectively prevents oxygen diffusion, and is resistant to high temperature annealing in oxygen environments. When used with an underlying Ta or TaN layer, the resulting conductive barrier also suppresses to diffusion of Ir into any underlying Si substrates. As a result, Ir silicide products are not formed, which degrade the electrode interface characteristics. That is, the Ir combination film remains conductive, not peeling or forming hillocks, during high temperature annealing processes, even in oxygen. A method for forming an Ir composite film barrier layer and Ir composite film ferroelectric electrode are also provided.
    • 提供了可用于形成铁电电容器的电极的Ir组合膜。 组合膜包括钽和氧,以及铱。 Ir组合膜有效防止氧气扩散,耐氧环境中耐高温退火。 当与下面的Ta或TaN层一起使用时,所得到的导电屏障还抑制Ir扩散到任何下面的Si衬底中。 结果,不形成铱硅化物产物,这降低了电极界面特性。 也就是说,即使在氧气中,Ir组合膜在高温退火过程中也保持导电性,不会剥离或形成小丘。 还提供了形成Ir复合膜阻挡层和Ir复合膜铁电电极的方法。
    • 43. 发明公开
    • Method for fabricating ferroelectric integrated circuits including a hydrogen heating step
    • 一种制备的铁电集成电路的用氢退火步骤过程
    • EP0954019A2
    • 1999-11-03
    • EP99102688.1
    • 1999-02-12
    • SYMETRIX CORPORATIONNEC Corporation
    • Cuchiaro, Joseph D.Furuya, AkiraPaz de AraujoMiyasaki, Yoichi
    • H01L21/324H01L21/316H01L27/115H01L21/8247G11C11/22
    • H01L27/11502G11C11/22H01L21/28291H01L21/31691H01L21/324H01L27/11507H01L28/55H01L28/56
    • An integrated circuit is formed that contains a ferroelectric element (122) comprising metal oxide material containing at least two metals. Various methods and structures are applied to minimize the degradation of ferroelectric properties caused by hydrogen during fabrication of the circuit. Oxygen is added to some elements of the integrated circuit to serve as a getter of hydrogen during fabrication steps. To minimize hydrogen degradation, the ferroelectric compound can be fabricated from a liquid precursor containing one or more of the constituent metals in excess of the amount corresponding to a stoichiometrically balanced concentration. A hydrogen barrier layer (126), preferably comprising titanium nitride, is formed to cover the top of the ferroelectric element (122). A hydrogen heat treatment in hydrogen gas is performed on the integrated circuit at a temperature from 200° to 350°C and for a time period not exceeding 30 minutes to minimize degradation of the ferroelectric properties by hydrogen while restoring other properties of the integrated circuit. An oxygen recovery anneal at 800°C after high-energy hydrogen steps restores ferroelectric properties.
    • 一种集成电路形成确实包含一个铁电元件(122)包括含有至少两种金属的金属氧化物材料。 各种方法和结构被施加到电路的制造过程中由氢引起的铁电特性的退化最小化。 氧气被添加到集成电路的一些元件以用作氢的过程中制造步骤的吸气剂。 为了最小化氢退化,铁电化合物可以从液体前体含有过量的化学计量量对应于一个平衡浓度组成金属的一个或多个来制造。 氢阻挡层(126),优选地包括氮化钛,形成为覆盖铁电元件(122)的顶部。 氢气中的氢热处理的温度下进行所述集成电路上从200℃至350℃并保持一定时间周期不超过30分钟的氢,同时恢复该集成电路的其它特性,以最小化铁电特性的退化。 高能量的氢步骤后,在800℃的氧复原退火恢复铁电特性。