Invention Grant
- Patent Title: Method of fabricating a field-effect transistor
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Application No.: US17038316Application Date: 2020-09-30
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Publication No.: US11545569B2Publication Date: 2023-01-03
- Inventor: Manoj Chandrika Reghunathan , Peter Hofmann
- Applicant: X-FAB SEMICONDUCTOR FOUNDRIES GMBH
- Applicant Address: DE Erfurt
- Assignee: X-FAB SEMICONDUCTOR FOUNDRIES GMBH
- Current Assignee: X-FAB SEMICONDUCTOR FOUNDRIES GMBH
- Current Assignee Address: DE Erfurt
- Agency: Thompson Hine LLP
- Priority: GB1708908 20170605
- Main IPC: H01L21/225
- IPC: H01L21/225 ; H01L29/78 ; H01L29/66 ; H01L21/8238 ; H01L29/08 ; H01L29/06

Abstract:
A method of fabricating a laterally diffused metal oxide semiconductor transistor including providing a substrate, forming a first well of a first doping polarity type in the substrate, forming a gate on a portion of the first well, the gate including an oxide layer and an at least partially conductive layer on the oxide layer, and forming a mask on at least a portion of the gate and at least a portion of the first well, wherein the mask has a sloping edge. The method further includes forming a second well of a second doping polarity type at least partially in the first well by implanting ions in the first well, the second well extending under a portion of the gate, the second doping polarity type being of opposite type to the first doping polarity type. The method includes forming a first one of a source and drain of the first doping polarity type in or on the second well, thereby defining a channel of the transistor under the gate. The method further includes forming a second one of the source and drain of the first doping polarity type in or on the first well, wherein the implanting includes directing at least a first beam of ions towards the first well at an angle substantially perpendicular to a surface plane of the substrate, and directing at least a second beam of ions towards the first well at an angle substantially offset from a surface normal of the substrate.
Public/Granted literature
- US20210013340A1 METHOD OF FABRICATING A FIELD-EFFECT TRANSISTOR Public/Granted day:2021-01-14
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