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    • 21. 发明授权
    • Method for manufacturing semiconductor device
    • 制造半导体器件的方法
    • US07547558B2
    • 2009-06-16
    • US10835311
    • 2004-04-30
    • Yoichi OkitaJunichi WatanabeNaoya Sashida
    • Yoichi OkitaJunichi WatanabeNaoya Sashida
    • H01L21/00
    • H01L28/57H01L27/11507
    • An Al2O3 film for covering a ferroelectric capacitor is formed by a sputtering process. The thickness of the Al2O3 film is preferably optimized according to amount of remanent polarization and fatigue tolerance required for the ferroelectric capacitor, for example, 10 nm to 100 nm. Next, oxygen is supplied to a PZT film via the Al2O3 film by executing a heat treatment in an oxygen atmosphere. As a result, an oxygen deficit in the PZT film is made up for. At this time, evaporation of Pb in the PZT film is suppressed because of the Al2O3 film, and deterioration of the fatigue tolerance responsive to decrease of Pb amount is suppressed. Subsequently, another Al2O3 film is formed as a second protective film by the sputtering process for opposing the deterioration factor in later process. The thickness of the Al2O3 film is preferably the thickness which sufficiently protects the ferroelectric capacitor from the deterioration factor in later wiring process.
    • 通过溅射法形成用于覆盖铁电电容器的Al 2 O 3膜。 Al 2 O 3膜的厚度优选根据强电介质电容器所需的剩余极化和耐疲劳性的量优化,例如10nm〜100nm。 接下来,通过在氧气氛中进行热处理,经由Al 2 O 3膜向PZT膜供给氧。 结果,PZT膜中的氧气缺乏。 此时,由于Al 2 O 3膜,PZT膜中的Pb的蒸发被抑制,并且抑制了响应于Pb量降低的疲劳强度的劣化。 随后,通过用于与稍后的工艺中的劣化因子相对的溅射工艺,形成另一Al 2 O 3膜作为第二保护膜。 Al 2 O 3膜的厚度优选是在稍后的布线处理中充分保护铁电体的劣化因子的厚度。