III-N TRANSISTORS WITH EPITAXIAL LAYERS PROVIDING STEEP SUBTHRESHOLD SWING
    17.
    发明申请
    III-N TRANSISTORS WITH EPITAXIAL LAYERS PROVIDING STEEP SUBTHRESHOLD SWING 审中-公开
    带有外延层的III-N晶体管提供STEEP SUBTHRESHOLD SWING

    公开(公告)号:US20160365435A1

    公开(公告)日:2016-12-15

    申请号:US15120732

    申请日:2014-03-25

    Abstract: III-N transistors with epitaxial semiconductor heterostructures having steep subthreshold slope are described. In embodiments, a III-N HFET employs a gate stack with balanced and opposing III-N polarization materials. Overall effective polarization of the opposing III-N polarization materials may be modulated by an external field, for example associated with an applied gate electrode voltage. In embodiments, polarization strength differences between the III-N materials within the gate stack are tuned by composition and/or film thickness to achieve a desired transistor threshold voltage (Vt). With polarization strengths within the gate stack balanced and opposing each other, both forward and reverse gate voltage sweeps may generate a steep sub-threshold swing in drain current as charge carriers are transferred to and from the III-N polarization layers and the III-N channel semiconductor.

    Abstract translation: 描述具有陡峭亚阈值斜率的外延半导体异质结构的III-N晶体管。 在实施例中,III-NHFET采用具有平衡和相对的III-N极化材料的栅极叠层。 相对的III-N偏振材料的总体有效极化可以通过外部场来调制,例如与施加的栅电极电压相关联。 在实施例中,栅堆叠内的III-N材料之间的极化强度差异通过组合和/或膜厚来调节以实现期望的晶体管阈值电压(Vt)。 由于栅极堆叠内的极化强度平衡和相互对置,正向和反向栅极电压扫描都可能在漏极电流中产生陡峭的次阈值摆幅,因为电荷载流子传输到III-N偏振层和III-N极化层 通道半导体。

    Epitaxial buffer layers for group III-N transistors on silicon substrates
    20.
    发明授权
    Epitaxial buffer layers for group III-N transistors on silicon substrates 有权
    在硅衬底上的III-N晶体管的外延缓冲层

    公开(公告)号:US09583574B2

    公开(公告)日:2017-02-28

    申请号:US13631514

    申请日:2012-09-28

    Abstract: Embodiments include epitaxial semiconductor stacks for reduced defect densities in III-N device layers grown over non-III-N substrates, such as silicon substrates. In embodiments, a metamorphic buffer includes an AlxIn1-xN layer lattice matched to an overlying GaN device layers to reduce thermal mismatch induced defects. Such crystalline epitaxial semiconductor stacks may be device layers for HEMT or LED fabrication, for example. System on Chip (SoC) solutions integrating an RFIC with a PMIC using a transistor technology based on group III-nitrides (III-N) capable of achieving high Ft and also sufficiently high breakdown voltage (BV) to implement high voltage and/or high power circuits may be provided on the semiconductor stacks in a first area of the silicon substrate while silicon-based CMOS circuitry is provided in a second area of the substrate.

    Abstract translation: 实施例包括用于在诸如硅衬底的非III-N衬底上生长的III-N器件层中的缺陷密度降低的外延半导体堆叠。 在实施例中,变质缓冲器包括与上覆GaN器件层匹配的Al x In 1-x N层晶格以减少热失配引起的缺陷。 这种结晶外延半导体叠层可以是用于例如HEMT或LED制造的器件层。 使用基于能够实现高Ft的III族氮化物(III-N)的晶体管技术并且还具有足够高的击穿电压(BV)来实现高电压和/或高电平的片上系统(SoC)解决方案集成RFIC与PMIC 电源电路可以设置在硅衬底的第一区域中的半导体堆叠上,而硅基CMOS电路设置在衬底的第二区域中。

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