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The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.

The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.

Patent No.:

US 10903354 B1

PDFFull Text
Date of Patent:
Jan. 26, 2021

Filed:

Apr. 01, 2019

Semiconductor device

Applicant:

Renesas Electronics Corporation, Tokyo, JP;

Inventor:

Yoshito Nakazawa, Ibaraki, JP;

Assignee:

RENESAS ELECTRONICS CORPORATION, Tokyo, JP;

Attorney:

McDermott Will & Emery LLP

Primary Examiner:

Marcos D Pizarro

Assistant Examiner:

Antonio B Crite

Int. Cl.
CPC ...
H01L 29/78 (2006.01); H01L 29/10 (2006.01); H01L 29/40 (2006.01); H01L 29/66 (2006.01); H01L 29/04 (2006.01); H01L 29/06 (2006.01); H01L 29/417 (2006.01); H01L 29/739 (2006.01); H01L 29/861 (2006.01); H01L 21/265 (2006.01); H01L 27/085 (2006.01);
U.S. Cl.
CPC ...
H01L 29/7813 (2013.01); H01L 29/1095 (2013.01); H01L 29/407 (2013.01); H01L 29/66734 (2013.01); H01L 29/7811 (2013.01);
Abstract

A semiconductor device includes: a cell region provided in a main surface of a semiconductor substrate composed of a crystal plane (100); a field insulating film embedded in the semiconductor substrate; and an annular p-type well region surrounding the cell region. The p-type well region includes a first region extending in a <010> direction, a second region extending in a <001> direction, and a third region connecting the first region and the second region and having an arc shape in plan view. The field insulating film has an opening provided in the p-type well region and extending along the p-type well region in plan view. The opening includes a first opening extending in the <010> direction in the first region and a second opening extending in the <001> direction in the second region, and the first opening and the second opening are divided from each other in the third region.

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