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    • 35. 发明授权
    • Ultrathin deposited gate dielectric formation using low-power, low-pressure PECVD for improved semiconductor device performance
    • 使用低功率,低压PECVD的超薄沉积栅介质形成,以改善半导体器件性能
    • US06251800B1
    • 2001-06-26
    • US09227513
    • 1999-01-06
    • Sey-Ping SunMark I. GardnerCharles E. May
    • Sey-Ping SunMark I. GardnerCharles E. May
    • H01L2131
    • H01L21/28185C23C16/402H01L21/02164H01L21/02211H01L21/02274H01L21/0228H01L21/02332H01L21/02337H01L21/28194H01L21/31612
    • An ultrathin gate dielectric and a method for forming the same are provided. The gate dielectric is believed to allow enhanced performance of semiconductor devices including transistors and dual-gate memory cells. A low-power, low-pressure plasma-enhanced chemical vapor deposition (PECVD) method employing silane and nitrous oxide sources is used to deposit the dielectric. As compared to conventional PECVD deposition, the method uses lower silane and nitrous oxide flow rates, a more dilute silane in nitrogen mixture, a lower chamber pressure, and a lower radio frequency power density. These settings allow plasma conditions to stabilize so that deposition may be performed in time increments at least as short as 0.1 second, so that oxide thicknesses at least as small as one angstrom may be controllably deposited. The oxide is preferably deposited in portions at multiple substrate mounting positions in a deposition chamber. Combination of oxide portions in this manner is believed to reduce the density of pinholes in the oxide, and the low-power, low-pressure deposition conditions are further believed to reduce plasma damage to the oxide and reduce the density of trap states in the oxide. A rapid thermal anneal of the oxide may be performed after deposition, and may improve the quality of the interface between the oxide and the underlying semiconductor substrate.
    • 提供一种超薄栅极电介质及其形成方法。 认为栅极电介质允许包括晶体管和双栅极存储器单元的半导体器件的增强的性能。 使用采用硅烷和一氧化二氮源的低功率,低压等离子体增强化学气相沉积(PECVD)方法沉积电介质。 与传统的PECVD沉积相比,该方法使用较低的硅烷和一氧化二氮流率,氮混合物中更稀的硅烷,较低的室压力和较低的射频功率密度。 这些设置允许等离子体条件稳定,使得可以以至少短至0.1秒的时间增量执行沉积,使得至少小至一埃的氧化物厚度可以可控地沉积。 优选在沉积室中的多个基板安装位置处部分地沉积氧化物。 认为以这种方式组合氧化物部分可以降低氧化物中针孔的密度,并且进一步认为低功率,低压沉积条件可减少对氧化物的等离子体损伤并降低氧化物中陷阱态的密度 。 可以在沉积之后进行氧化物的快速热退火,并且可以提高氧化物和下面的半导体衬底之间的界面的质量。
    • 40. 发明申请
    • STRUCTURE AND METHOD OF MANUFACTURING A STRAINED FinFET WITH STRESSED SILICIDE
    • 具有应力硅化物的应变FinFET的结构和方法
    • US20080173942A1
    • 2008-07-24
    • US11625431
    • 2007-01-22
    • Huilong ZhuSiddhartha PandaJay W. StraneSey-Ping SunBrian L. Tessier
    • Huilong ZhuSiddhartha PandaJay W. StraneSey-Ping SunBrian L. Tessier
    • H01L29/786H01L21/336
    • H01L29/785H01L29/66795
    • A stressed semiconductor structure including at least one FinFET device on a surface of a substrate, typically a buried insulating layer of an initial semiconductor-on-insulator substrate, is provided. In a preferred embodiment, the at least one FinFET device includes a semiconductor Fin that is located on an unetched portion of the buried insulator layer which has a raised height as compared to an adjacent and adjoining etched portion of the buried insulating layer. The semiconductor Fin includes a gate dielectric on its sidewalls and optionally a hard mask located on an upper surface thereof. The inventive structure also includes a gate conductor, which is located on the surface of the substrate, typically the buried insulating layer, and the gate conductor is at least laterally adjacent to the gate dielectric located on the sidewalls of the semiconductor Fin. A stressed silicide is located on the gate conductor, which introduces stress into the channel of the FinFET device. The stressed silicide memorizes the stress from a sacrificial stressed film that is formed prior to forming the stressed silicide. The stress type of the stressed film is introduced into the silicide during a silicide anneal step.
    • 提供了一种应力半导体结构,其包括在衬底的表面上的至少一个FinFET器件,通常是初始绝缘体上半导体衬底的掩埋绝缘层。 在优选实施例中,所述至少一个FinFET器件包括位于所述掩埋绝缘体层的未蚀刻部分上的半导体Fin,所述半导体Fin与所述掩埋绝缘层的相邻和相邻蚀刻部分相比具有升高的高度。 半导体鳍包括其侧壁上的栅极电介质和任选地位于其上表面上的硬掩模。 本发明的结构还包括栅极导体,其位于衬底的表面上,通常为掩埋绝缘层,并且栅极导体至少横向邻近位于半导体Fin的侧壁上的栅极电介质。 应力硅化物位于栅极导体上,其将应力引入FinFET器件的沟道中。 应力硅化物记忆在形成应力硅化物之前形成的牺牲应力膜的应力。 在硅化物退火步骤期间,将应力膜的应力类型引入到硅化物中。