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    • 7. 发明授权
    • Metal interconnect structure for an integrated circuit with improved
electromigration reliability
    • 具有改善的电迁移可靠性的集成电路的金属互连结构
    • US5641992A
    • 1997-06-24
    • US513494
    • 1995-08-10
    • Pei-Ing Paul LeeBernd VollmerDarryl RestainoBill Klaasen
    • Pei-Ing Paul LeeBernd VollmerDarryl RestainoBill Klaasen
    • H01L21/28H01L21/285H01L21/768H01L23/532H01L23/48
    • H01L21/76843H01L21/28512H01L21/7685H01L21/76877H01L23/53223H01L2924/0002
    • A multilayer interconnect structure for a semiconductor integrated circuit comprising a base layer of titanium, a second layer of titanium nitride, a third layer of an aluminum alloy and a top layer of titanium nitride. All of the layers contained within the multilayer interconnect structure are deposited by in-situ deposition in an ultra-high vacuum deposition system. The different layers deposited in the deposition system are conducted consecutively without a disruption to the vacuum. Although each layer in the multilayer interconnect structure are deposited within the integrated ultra-high vacuum deposition system, with multiple deposition chambers, the deposition of the different layers is conducted at different temperatures. The time to the electromigration failure of the multilayer interconnect structure, caused by the electromigration of the aluminum alloy, is greatly increased by depositing the aluminum alloy layer at a temperature in excess of 300.degree. C. and preferably between 350.degree. C. and 550.degree. C. The titanium layer and the adjacent titanium nitride layer below the aluminum alloy layer provide the interconnect structure with low resistivity and prevent alloy spiking of the base substrate. As a result, a multilayer interconnect structure provided that has improved electromigration reliability and a low resistance, thereby enabling more dense applications within an integrated circuit.
    • 一种用于半导体集成电路的多层互连结构,包括钛基底层,第二氮化钛层,第三层铝合金和顶层氮化钛。 包含在多层互连结构内的所有层通过原位沉积沉积在超高真空沉积系统中。 沉积在沉积系统中的不同层连续进行,而不会破坏真空。 尽管多层互连结构中的每个层都沉积在具有多个沉积室的集成超高真空沉积系统内,但不同层的沉积在不同的温度下进行。 通过在超过300℃,优选350℃至550℃的温度下沉积铝合金层,由铝合金的电迁移引起的多层互连结构的电迁移故障的时间大大增加。 C.在铝合金层下面的钛层和相邻的氮化钛层提供具有低电阻率的互连结构并防止基底衬底的合金尖峰。 结果,提供了具有改善的电迁移可靠性和低电阻的多层互连结构,从而使集成电路内的应用更加密集。