A silicon-carbide mosfet cell structure and method for forming same
    13.
    发明公开
    A silicon-carbide mosfet cell structure and method for forming same 审中-公开
    硅酸镁MOSFET-Zellenstruktur und Herstellungsverfahrendafür

    公开(公告)号:EP2551912A2

    公开(公告)日:2013-01-30

    申请号:EP12177404.6

    申请日:2012-07-20

    Abstract: In one embodiment, the invention comprises a silicon-carbide MOSFET comprising individual MOSFET cells. Each cell comprises a U-shaped well (228) (P type) and two parallel sources (260) (N type) formed within the well. A plurality of source rungs (262) (doped N) connect sources (260) at multiple locations. Regions between two rungs (262) comprise a body region (252) (P type). These features are formed on an N-type epitaxial layer (220), which is formed on an N-type substrate (216). A contact (290) extends across and contacts a plurality of source rungs (262) and body regions (252). Gate oxide and a gate contact overlie a leg of a well of a first cell and a leg of a well of a second adjacent cell, inverting the conductivity responsive to a gate voltage. A MOSFET comprises a plurality of these cells to attain a desired low channel resistance. The cell regions are formed using self-alignment techniques at several states of the fabrication process.

    Abstract translation: 在一个实施例中,本发明包括包含单个MOSFET电池的碳化硅MOSFET。 每个单元包括形成在井内的U形孔(228)(P型)和两个平行源(260)(N型)。 在多个位置处多个源极(262)(掺杂的N)连接源(260)。 两个梯级(262)之间的区域包括主体区域(252)(P型)。 这些特征形成在形成在N型衬底(216)上的N型外延层(220)上。 接触件(290)跨越并接触多个源极(262)和主体区域(252)。 栅极氧化物和栅极接触覆盖在第二相邻电池的阱的第一电池和阱的阱的支路上,响应于栅极电压而反转电导率。 MOSFET包括多个这些单元以获得期望的低通道电阻。 在制造过程的几个状态下使用自对准技术形成单元区域。

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