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    • 21. 发明申请
    • DEVICE WITH STRESSED CHANNEL
    • 具有应力通道的设备
    • US20110031503A1
    • 2011-02-10
    • US12538627
    • 2009-08-10
    • Bruce B. DorisJohnathan E. FaltermeierLahir S. AdamBalasubramanian S. Haran
    • Bruce B. DorisJohnathan E. FaltermeierLahir S. AdamBalasubramanian S. Haran
    • H01L29/161H01L27/092H01L21/04H01L21/8238
    • H01L21/823807H01L21/823814H01L29/66628H01L29/66636H01L29/7848
    • An FET device is disclosed which contains a source and a drain that are each provided with an extension. The source and the drain, and their extensions, are composed of epitaxial materials containing Ge or C. The epitaxial materials and the Si substrate have differing lattice constants, consequently the source and the drain and their extensions are imparting a state of stress onto the channel. For a PFET device the epitaxial material may be SiGe, or Ge, and the channel may be in a compressive state of stress. For an NFET device the epitaxial material may be SiC and the channel may be in a tensile state of stress. A method for fabricating an FET device is also disclosed. One may form a first recession in the Si substrate to a first depth on opposing sides of the gate. The first recession is filled epitaxially with a first epitaxial material. Then, a second recession may be formed in the Si substrate to a second depth, which is greater than the first depth. Next, one may fill the second recession with a second epitaxial material, which is the same kind of material as the first epitaxial material. The epitaxial materials are selected to have a different lattice constant than the Si substrate, and consequently a state of stress is being imparted onto the channel.
    • 公开了一种FET器件,其包含各自具有延伸部的源极和漏极。 源极和漏极及其延伸部分由包含Ge或C的外延材料组成。外延材料和Si衬底具有不同的晶格常数,因此源极和漏极及其延伸部分在沟道上赋予应力状态 。 对于PFET器件,外延材料可以是SiGe或Ge,并且沟道可以处于压应力的压缩状态。 对于NFET器件,外延材料可以是SiC,并且沟道可以处于应力的拉伸状态。 还公开了一种用于制造FET器件的方法。 可以在Si衬底中形成第一凹陷到栅极的相对侧上的第一深度。 用第一外延材料外延地填充第一次衰退。 然后,可以在Si衬底中形成比第一深度更大的第二深度的第二凹陷。 接下来,可以用与第一外延材料相同的材料的第二外延材料填充第二凹陷。 选择外延材料具有与Si衬底不同的晶格常数,并且因此在沟道上施加应力状态。