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    • 26. 发明专利
    • Semiconductor device
    • 半导体器件
    • JP2014116399A
    • 2014-06-26
    • JP2012268293
    • 2012-12-07
    • Toyota Motor Corpトヨタ自動車株式会社
    • SAWADA TOMONARI
    • H01L29/78H01L21/336H01L29/41H01L29/423H01L29/49
    • H01L29/7827H01L29/0634H01L29/407H01L29/4236H01L29/4916H01L29/4925H01L29/7397
    • PROBLEM TO BE SOLVED: To provide a high breakdown voltage semiconductor device in which a leak current is suppressed.SOLUTION: The semiconductor device has: a semiconductor substrate comprising a drift layer of a first conductivity type, a body layer of a second conductivity type which is formed on a surface of the drift layer, and a source layer formed on a part of a surface of the body layer; and a trench gate penetrating through the source layer and the body layer from a surface of the semiconductor substrate to the drift layer. The trench gate includes a trench formed in the semiconductor substrate, a gate insulating film formed on an inner wall surface of the trench, and a gate electrode covered by the gate insulating film and accommodated in the trench. The gate electrode has a region located on the side closer to the drift layer than the boundary between the body layer and the drift layer. The region includes at least one first semiconductor layer of the first conductivity type and one second semiconductor layer of the second conductivity type. The first semiconductor layer and the second semiconductor layer are joined to each other and arranged alternately.
    • 要解决的问题:提供抑制泄漏电流的高耐压电压半导体器件。解决方案:半导体器件具有:半导体衬底,其包括第一导电类型的漂移层,第二导电类型的体层, 形成在所述漂移层的表面上,以及源层,形成在所述主体层的表面的一部分上; 以及从半导体衬底的表面穿透源极层和主体层到沟道层的沟槽栅极。 沟槽栅极包括形成在半导体衬底中的沟槽,形成在沟槽的内壁表面上的栅极绝缘膜和被栅极绝缘膜覆盖并容纳在沟槽中的栅电极。 栅电极具有位于比体层和漂移层之间的边界更靠近漂移层的一侧的区域。 该区域包括第一导电类型的至少一个第一半导体层和第二导电类型的一个第二半导体层。 第一半导体层和第二半导体层彼此接合并交替布置。