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    • 1. 发明授权
    • Process for fabricating a semiconductor device having an improved metal
interconnect structure
    • 具有改进的金属互连结构的半导体器件的制造方法
    • US5527739A
    • 1996-06-18
    • US448157
    • 1995-05-23
    • Louis C. ParrilloJeffrey L. Klein
    • Louis C. ParrilloJeffrey L. Klein
    • H01L23/522H01L23/532H01L21/28
    • H01L23/53238H01L23/5226H01L23/53219H01L2924/0002Y10S438/927
    • A metal interconnect structure includes copper interface layers (24, 30) located between a refractory metal via plug (28), and first and second metal interconnect layers (16, 32). The copper interface layers (24, 30) are confined to the area of a via opening (22) in an insulating layer (20) overlying the first interconnect layer (16) and containing the via plug (28). The interface layers (24, 30) are subjected to an anneal to provide copper reservoirs (36, 37) in the interconnect layers (16, 32) adjacent to the interface layers (24, 30). The copper reservoirs (36, 37) continuously replenish copper depleted from the interface when an electric current is passed through the interconnect structure. A process includes the selective deposition of copper onto an exposed region (23) of the first metal interconnect layer (16), and onto the upper portion the via plug (28), followed by an anneal in forming gas to form the copper reservoirs (36, 37).
    • 金属互连结构包括位于耐火金属通孔塞(28)和第一和第二金属互连层(16,32)之间的铜界面层(24,30)。 铜界面层(24,30)被限制在覆盖在第一互连层(16)上并包含通孔塞(28)的绝缘层(20)中的通路孔(22)的区域中。 对界面层(24,30)进行退火处理,以在与界面层(24,30)相邻的互连层(16,32)中提供铜储存器(36,37)。 当电流通过互连结构时,铜储存器(36,37)连续补充从界面耗尽的铜。 一种方法包括将铜选择性沉积在第一金属互连层(16)的暴露区域(23)上,并在上部通孔塞(28)上,然后在形成气体中进行退火以形成铜储存器 36,37)。
    • 2. 发明授权
    • Semiconductor device having an improved metal interconnect structure
    • 具有改进的金属互连结构的半导体器件
    • US5442235A
    • 1995-08-15
    • US172320
    • 1993-12-23
    • Louis C. ParrilloJeffrey L. Klein
    • Louis C. ParrilloJeffrey L. Klein
    • H01L23/522H01L23/532H01L29/460
    • H01L23/53238H01L23/5226H01L23/53219H01L2924/0002Y10S438/927
    • A metal interconnect structure includes copper interface layers (24, 30) located between a refractory metal via plug (28), and first and second metal interconnect layers (16, 32). The copper interface layers (24, 30) are confined to the area of a via opening (22) in an insulating layer (20) overlying the first interconnect layer (16) and containing the via plug (28). The interface layers (24, 30) are subjected to an anneal to provide copper reservoirs (36, 37) in the interconnect layers (16, 32) adjacent to the interface layers (24, 30). The copper reservoirs (36, 37) continuously replenish copper depleted from the interface when an electric current is passed through the interconnect structure. A process includes the selective deposition of copper onto an exposed region (23) of the first metal interconnect layer (16), and onto the upper portion the via plug (28), followed by an anneal in forming gas to form the copper reservoirs (36, 37).
    • 金属互连结构包括位于耐火金属通孔塞(28)和第一和第二金属互连层(16,32)之间的铜界面层(24,30)。 铜界面层(24,30)被限制在覆盖在第一互连层(16)上并包含通孔塞(28)的绝缘层(20)中的通路孔(22)的区域中。 对界面层(24,30)进行退火处理,以在与界面层(24,30)相邻的互连层(16,32)中提供铜储存器(36,37)。 当电流通过互连结构时,铜储存器(36,37)连续补充从界面耗尽的铜。 一种方法包括将铜选择性沉积在第一金属互连层(16)的暴露区域(23)上,并在上部通孔塞(28)上,然后在形成气体中进行退火以形成铜储存器 36,37)。
    • 3. 发明授权
    • Method for forming self-aligned vias in multi-level metal integrated
circuits
    • 在多级金属集成电路中形成自对准通孔的方法
    • US4917759A
    • 1990-04-17
    • US339451
    • 1989-04-17
    • Duncan M. FisherJeffrey L. Klein
    • Duncan M. FisherJeffrey L. Klein
    • H01L21/768H01L23/522
    • H01L21/76885H01L23/5226H01L2924/0002
    • A process for forming a via in a semiconductor device using a self-aligned metal pillar to connect metal layers separated by a dielectric. A first aluminum layer is formed on an oxide layer overlying a semiconductor substrate, and a thin tungsten layer is formed and patterned overlying the first aluminum layer. The pattern in this tungsten layer will determine the pattern for the first level of metal interconnect to be formed later in the first aluminum layer. The tungsten layer is etched using the underlying first aluminum layer as an etch stop. A second aluminum layer is then formed overlying the patterned tungsten layer and the exposed regions of the first aluminum layer. In one continuous etching step the second aluminum layer is patterned and etched to form a pillar, and the first aluminum layer is etched to form the first level of metal interconnect in the semiconductor device using the pattern formed earlier in the tungsten layer and to expose regions of the oxide layer. A dielectric is deposited overlying the exposed regions of the oxide layer, the formed pillar, and the thin tungsten layer. This dielectric is etched back to expose the top of the pillar, and then a third aluminum layer is deposited overlying the dielectric to make electrical contact to the exposed surface of the pillar.
    • 在半导体器件中使用自对准金属柱形成通孔以连接由电介质隔开的金属层的工艺。 在覆盖半导体衬底的氧化物层上形成第一铝层,并且形成覆盖在第一铝层上的薄钨层。 该钨层中的图案将确定在第一铝层中稍后形成的第一级金属互连的图案。 使用下面的第一铝层作为蚀刻停止层来蚀刻钨层。 然后形成第二铝层,覆盖图案化的钨层和第一铝层的暴露区域。 在一个连续蚀刻步骤中,对第二铝层进行图案化和蚀刻以形成柱,并且使用在钨层中较早形成的图案,在半导体器件中蚀刻第一铝层以形成第一级金属互连,并暴露区域 的氧化物层。 沉积在氧化物层,形成的柱和薄钨层的暴露区域上的电介质。 将该电介质回蚀以暴露柱的顶部,然后沉积覆盖在电介质上的第三铝层以与柱的暴露表面电接触。
    • 8. 发明授权
    • LDD transistor process having doping sensitive endpoint etching
    • 具有掺杂敏感端点蚀刻的LDD晶体管工艺
    • US4978626A
    • 1990-12-18
    • US240013
    • 1988-09-02
    • Stephen S. PoonJames R. PfiesterFrank K. BakerJeffrey L. Klein
    • Stephen S. PoonJames R. PfiesterFrank K. BakerJeffrey L. Klein
    • H01L21/28H01L21/336H01L21/8238H01L27/092H01L29/78
    • H01L29/6659H01L21/28114H01L21/823828H01L29/78H01L29/7836H01L27/0928
    • An LDD transistor is formed by using a process which insures that a layer of gate oxide is not inadvertently etched into and is not ruptured by static electrical charges. At least two thicknesses of gate electrode material of varying doping levels are formed over a layer of gate oxide which is above a semiconductor substrate. A chemical etch is utilized wherein by monitoring a ratio of chemical product and chemical reactant of the chemical etch reactions, specific endpoints in the etching of the gate electrode material can be easily detected. A small layer of gate electrode material is allowed to remain over the gate oxide layer during ion implanting and the formation and removal of gate sidewall spacers used in fabricating an LDD transistor. After formation of most of the LDD transistor, the remaining protective thickness of gate electrode material is removed and the exposed gate oxide layer is exposed to a final oxidizing anneal step. In other forms, an inverse-T gate structure LDD transistor is formed, and an LDD transistor is formed via a process having a reduced number of ion implants steps.
    • 通过使用确保栅极氧化物层不会被无意蚀刻而不被静电电荷破裂的工艺形成LDD晶体管。 在半导体衬底之上的栅极氧化物层上形成具有不同掺杂水平的至少两个厚度的栅电极材料。 使用化学蚀刻,其中通过监测化学蚀刻反应的化学产品和化学反应物的比例,可以容易地检测到栅电极材料的蚀刻中的特定端点。 在离子注入期间允许一小层栅电极材料保留在栅极氧化物层上方,并且在制造LDD晶体管时形成和去除栅极侧壁间隔物。 在形成大多数LDD晶体管之后,去除栅电极材料的剩余保护厚度,暴露的栅极氧化层暴露于最后的氧化退火步骤。 在其他形式中,形成逆T栅极结构LDD晶体管,并且通过具有减少数量的离子注入步骤的工艺形成LDD晶体管。