发明授权
- 专利标题: Trench-gated MIS devices
- 专利标题(中): 沟通门槛MIS设备
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申请号: US12917378申请日: 2010-11-01
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公开(公告)号: US09324858B2公开(公告)日: 2016-04-26
- 发明人: Anup Bhalla , Dorman Pitzer , Jacek Korec , Xiaorong Shi , Sik Lui
- 申请人: Anup Bhalla , Dorman Pitzer , Jacek Korec , Xiaorong Shi , Sik Lui
- 申请人地址: US CA Santa Clara
- 专利权人: Vishay-Siliconix
- 当前专利权人: Vishay-Siliconix
- 当前专利权人地址: US CA Santa Clara
- 主分类号: H01L29/76
- IPC分类号: H01L29/76 ; H01L29/78 ; H01L21/8234 ; H01L27/088 ; H01L29/423 ; H01L29/66 ; H01L29/06 ; H01L29/10 ; H01L29/40 ; H01L29/872
摘要:
In a trench-gated MIS device contact is made to the gate within the trench, thereby eliminating the need to have the gate material, typically polysilicon, extend outside of the trench. This avoids the problem of stress at the upper corners of the trench. Contact between the gate metal and the polysilicon is normally made in a gate metal region that is outside the active region of the device. Various configurations for making the contact between the gate metal and the polysilicon are described, including embodiments wherein the trench is widened in the area of contact. Since the polysilicon is etched back below the top surface of the silicon throughout the device, there is normally no need for a polysilicon mask, thereby saving fabrication costs.
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