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发明授权
CN107919383B 开关元件 有权

开关元件
摘要：
本发明提供一种开关元件，抑制在连接区域产生的电场。开关元件具备：半导体基板；沟槽，设于半导体基板的上表面；栅极绝缘层，覆盖沟槽的内表面；以及栅电极，配置于沟槽内，并且通过栅极绝缘层而与半导体基板绝缘。半导体基板具备：第一导电型的第一半导体区域，与栅极绝缘层接触；第二导电型的体区域，在第一半导体区域的下侧与栅极绝缘层接触；第一导电型的第二半导体区域，在体区域的下侧与栅极绝缘层接触；第二导电型的底部区域，在沟槽的底面与栅极绝缘层接触；以及第二导电型的连接区域，在沟槽的侧面与栅极绝缘层接触，并且将体区域与底部区域连接。连接区域的厚度比底部区域的厚度厚。
摘要（英）：

A switching device may be provided with: a semiconductor substrate; a trench provided in an upper surface of the semiconductor substrate; a gate insulating layer covering an inner surface of the trench; and a gate electrode located in the trench. The semiconductor substrate includes: a first semiconductor region being in contact with the gate insulating layer; a body region being in contact with the gate insulating layer under the first semiconductor region; a second semiconductor region being in contact with the gate insulating layer under the body region; a bottom region being in contact with the gate insulating layer at a bottom surface of the trench; and a connection region being in contact with the gate insulating layer at a lateral surface of the trench and connecting the body region and the bottom region. The connection region is thicker than the bottom region.

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