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    • 1. 发明申请
    • METAL ALLOY LAYER OVER CONDUCTIVE REGION OF TRANSISTOR DEVICE OF DIFFERENT CONDUCTIVE MATERIAL THAN CONDUCTIVE REGION
    • 不同导电材料与导电区域的晶体管器件导电区域的金属合金层
    • US20070284654A1
    • 2007-12-13
    • US11422965
    • 2006-06-08
    • Judith M. RubinoJames PanDinkar SinghJonathan SmithAnna Topol
    • Judith M. RubinoJames PanDinkar SinghJonathan SmithAnna Topol
    • H01L29/76
    • H01L29/78H01L29/7845
    • A transistor device and method are disclosed for reducing parasitic resistance and enhancing channel mobility using a metal alloy layer over a conductive region. A transistor device may include a conductive region such as a source, drain and/or gate including at least one first conductive material, and a metal alloy layer disposed on substantially all of a surface of the conductive region, the metal alloy layer including a second conductive material different than the at least one first conductive materials. In one embodiment, the second conductive material includes a cobalt and/or nickel alloy. The metal alloy layer provides a non-epitaxial raised source/drain (and gate) to reduce the parasitic series resistance in, for example, nFETs fabricated on UTSOI. In addition, the metal alloy layer may include a stress to enhance mobility in a channel of the transistor device. The metal alloy layer may be formed using a selective electrochemical metal deposition process such as electroless or electrolytic plating.
    • 公开了一种晶体管器件和方法,用于在导电区域上使用金属合金层降低寄生电阻并增强沟道迁移率。 晶体管器件可以包括导电区域,例如包括至少一个第一导电材料的源极,漏极和/或栅极以及设置在导电区域的基本上所有表面上的金属合金层,金属合金层包括第二导电区域 导电材料不同于至少一种第一导电材料。 在一个实施例中,第二导电材料包括钴和/或镍合金。 金属合金层提供非外延凸起的源极/漏极(和栅极),以减少例如在UTSOI上制造的nFET的寄生串联电阻。 此外,金属合金层可以包括提高晶体管器件的沟道中的迁移率的应力。 可以使用诸如无电镀或电解电镀的选择性电化学金属沉积工艺来形成金属合金层。
    • 5. 发明授权
    • Reduced electromigration and stressed induced migration of copper wires by surface coating
    • 通过表面涂层减少电迁移和应力诱导的铜线迁移
    • US07468320B2
    • 2008-12-23
    • US11183773
    • 2005-07-19
    • Chao-Kun HuRobert RosenbergJudith M. RubinoCarlos J. SambucettiAnthony K. Stamper
    • Chao-Kun HuRobert RosenbergJudith M. RubinoCarlos J. SambucettiAnthony K. Stamper
    • H01L21/44
    • H01L21/76843H01L21/288H01L21/76849H01L21/76864H01L23/53228H01L23/53238H01L23/5329H01L2924/0002H01L2924/00
    • The idea of the invention is to coat the free surface of patterned Cu conducting lines in on-chip interconnections (BEOL) wiring by a 1-20 nm thick metal layer prior to deposition of the interlevel dielectric. This coating is sufficiently thin so as to obviate the need for additional planarization by polishing, while providing protection against oxidation and surface, or interface, diffusion of Cu which has been identified by the inventors as the leading contributor to metal line failure by electromigration and thermal stress voiding. Also, the metal layer increases the adhesion strength between the Cu and dielectric so as to further increase lifetime and facilitate process yield. The free surface is a direct result of the CMP (chemical mechanical polishing) in a damascene process or in a dry etching process by which Cu wiring is patterned. It is proposed that the metal capping layer be deposited by a selective process onto the Cu to minimize further processing. We have used electroless metal coatings, such as CoWP, CoSnP and Pd, to illustrate significant reliability benefits, although chemical vapor deposition (CVD) of metals or metal forming compounds can be employed.
    • 本发明的想法是在沉积层间电介质之前,通过1-20nm厚的金属层将芯片上互连(BEOL)布线中的图案化Cu导线的自由表面涂覆。 该涂层足够薄,以便消除对通过抛光进行附加平面化的需要,同时提供了防止氧化和表面或Cu的扩散的保护,这已经被本发明人鉴定为导致金属线路故障的主要贡献者通过电迁移和热 压力消除。 此外,金属层增加了Cu和电介质之间的粘合强度,从而进一步增加寿命并且有助于工艺产量。 自由表面是在镶嵌工艺中的CMP(化学机械抛光)或通过图形化Cu布线的干蚀刻工艺的直接结果。 提出通过选择性方法将金属覆盖层沉积到Cu上以最小化进一步的加工。 尽管可以使用金属或金属形成化合物的化学气相沉积(CVD),但我们已经使用了无电金属涂层,例如CoWP,CoSnP和Pd来说明显着的可靠性优点。