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    • 15. 发明公开
    • Method of fabricating a deep trench insulated gate bipolar transistor
    • Verfahren zur Herstellung eines bipolaren Transistors mit tiefgrabenisoliertem Gate
    • EP2482320A2
    • 2012-08-01
    • EP12164824.0
    • 2009-12-18
    • Power Integrations, Inc.
    • Parthasarathy, VijayBanerjee, Sujit
    • H01L29/739H01L21/331H01L29/66
    • H01L29/7397H01L29/66333
    • In one embodiment, a method comprises forming an epitaxial layer over a substrate of an opposite conductivity type, the epitaxial layer being separated by a buffer layer having a doping concentration that is substantially constant in a vertical direction down to the buffer layer. A pair of spaced-apart trenches is formed in the epitaxial layer from a top surface of the epitaxial layer down at least into the buffer layer. A dielectric material is formed in the trenches over the first and second sidewall portions. Source/collector and body regions of are formed at the top of the epitaxial layer, the body region separating the source/collector region of the pillar from a drift region of the epitaxial layer that extends from the body region to the buffer layer. An insulated gate member is then formed in each of the trenches adjacent to and insulated from the body region.
    • 在一个实施例中,一种方法包括在相反导电类型的衬底上形成外延层,该外延层被缓冲层隔开,该缓冲层的垂直方向上的缓冲层的掺杂浓度基本上是恒定的。 至少在缓冲层中,从外延层的顶表面在外延层中形成一对间隔开的沟槽。 介电材料形成在第一和第二侧壁部分上的沟槽中。 源极/集电极和主体区域形成在外延层的顶部,体区域将柱的源极/集电极区域与从体区域延伸到缓冲层的外延层的漂移区域分离。 然后在与身体区域相邻并与其绝缘的每个沟槽中形成绝缘门构件。