Invention Grant
- Patent Title: Trench-gated MIS devices
- Patent Title (中): 沟通门槛MIS设备
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Application No.: US12917378Application Date: 2010-11-01
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Publication No.: US09324858B2Publication Date: 2016-04-26
- Inventor: Anup Bhalla , Dorman Pitzer , Jacek Korec , Xiaorong Shi , Sik Lui
- Applicant: Anup Bhalla , Dorman Pitzer , Jacek Korec , Xiaorong Shi , Sik Lui
- Applicant Address: US CA Santa Clara
- Assignee: Vishay-Siliconix
- Current Assignee: Vishay-Siliconix
- Current Assignee Address: US CA Santa Clara
- Main IPC: H01L29/76
- IPC: H01L29/76 ; H01L29/78 ; H01L21/8234 ; H01L27/088 ; H01L29/423 ; H01L29/66 ; H01L29/06 ; H01L29/10 ; H01L29/40 ; H01L29/872

Abstract:
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.
Public/Granted literature
- US20110042742A1 STRUCTURES OF AND METHODS OF FABRICATING TRENCH-GATED MIS DEVICES Public/Granted day:2011-02-24
Information query
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