Invention Grant
US07713822B2 Method of forming high density trench FET with integrated Schottky diode
有权
用集成肖特基二极管形成高密度沟槽FET的方法
- Patent Title: Method of forming high density trench FET with integrated Schottky diode
- Patent Title (中): 用集成肖特基二极管形成高密度沟槽FET的方法
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Application No.: US12249889Application Date: 2008-10-10
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Publication No.: US07713822B2Publication Date: 2010-05-11
- Inventor: Paul Thorup , Ashok Challa , Bruce Douglas Marchant
- Applicant: Paul Thorup , Ashok Challa , Bruce Douglas Marchant
- Applicant Address: US ME South Portland
- Assignee: Fairchild Semiconductor Corporation
- Current Assignee: Fairchild Semiconductor Corporation
- Current Assignee Address: US ME South Portland
- Agency: Townsend and Townsend and Crew LLP
- Main IPC: H01L29/76
- IPC: H01L29/76 ; H01L29/94

Abstract:
A method of forming a monolithically integrated trench FET and Schottky diode includes the following steps. Two trenches are formed extending through an upper silicon layer and terminating within a lower silicon layer. The upper and lower silicon layers have a first conductivity type. First and second silicon regions of a second conductivity type are formed in the upper silicon layer between the pair of trenches. A third silicon region of the first conductivity type is formed extending into the first and second silicon regions between the pair of trenches such that remaining lower portions of the first and second silicon regions form two body regions separated by a portion of the upper silicon layer. A silicon etch is performed to form a contact opening extending through the first silicon region such that outer portions of the first silicon region remain, the outer portions forming source regions. An interconnect layer is formed filling the contact opening so as to electrically contact the source regions and the portion of the upper silicon layer. The interconnect layer electrically contacts the second silicon region so as to form a Schottky contact therebetween.
Public/Granted literature
- US20090035900A1 Method of Forming High Density Trench FET with Integrated Schottky Diode Public/Granted day:2009-02-05
Information query
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