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.:
Date of Patent:
Mar. 25, 2014
Filed:
Apr. 21, 2011
Wei-chieh Lin, Hsinchu, TW;
Jia-fu Lin, Yilan County, TW;
Wei-Chieh Lin, Hsinchu, TW;
Jia-Fu Lin, Yilan County, TW;
Sinopower Semiconductor Inc., Hsinchu Science Park, Hsinchu, TW;
Abstract
A manufacturing method of a depletion mode trench semiconductor device includes following steps. Firstly, a substrate including a drift epitaxial layer disposed thereon is provided. A trench is disposed in the drift epitaxial layer. A gate dielectric layer is formed on an inner sidewall of the trench and an upper surface of the drift epitaxial layer. A base doped region is formed in the drift epitaxial layer and adjacent to a side of the trench. A thin doped region is formed and conformally contacts the gate dielectric layer. A gate material layer is formed to fill the trench. A source doped region is formed in the base doped region, and the source doped region overlaps the thin doped region at a side of the trench. Finally, a contact doped region is formed to overlap the thin doped region, and the contact doped region is adjacent to the source doped region.