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    • 6. 发明申请
    • Buried well for semiconductor devices
    • 埋在半导体器件上
    • US20070069309A1
    • 2007-03-29
    • US11235575
    • 2005-09-26
    • Richard LindsayPhung NguyenJeong-Hwan Yang
    • Richard LindsayPhung NguyenJeong-Hwan Yang
    • H01L29/76
    • H01L29/105H01L29/1087
    • A substrate having a buried well is provided. The substrate may be formed by implanting ions in a surface well of a first substrate and subsequently forming a semiconductor layer, such as an epitaxial layer, over the surface well. In this manner, the surface well becomes a buried well having a semiconductor layer that is substantially undoped formed thereon. In an embodiment, a transistor is formed on the substrate. Because the epitaxial layer is substantially undoped, the transistor may be formed such that the junction capacitance between the source/drain regions and the underlying region is reduced. If desired, the epitaxial layer, or a portion thereof, may be doped to decrease the resistance between the channel region and the well contact.
    • 提供具有埋置井的衬底。 衬底可以通过在第一衬底的表面阱中注入离子并随后在表面上形成诸如外延层的半导体层来形成。 以这种方式,表面阱成为具有基本上未掺杂的半导体层的掩埋阱。 在一个实施例中,在衬底上形成晶体管。 因为外延层基本上是未掺杂的,所以可以形成晶体管,使得源极/漏极区域与下面的区域之间的结电容减小。 如果需要,可以掺杂外延层或其一部分以减小沟道区和阱接触之间的电阻。