Patent ID: 7482212
Filing Date: 2009-01-27
Classification: H01L

Abstract:
1. A method of manufacturing a semiconductor device, comprising: forming a trench on a first surface of a silicon substrate; forming a thermal oxide layer on the trench and the silicon substrate; depositing an oxide layer on the trench and the silicon substrate; overturning the silicon substrate; planarizing a second surface of the silicon substrate by a chemical mechanical polishing (CMP) process; and forming a transistor on the second surface of the silicon substrate wherein the forming of the transistor comprises: forming a gate electrode on the second surface of the silicon substrate over the trench; forming extended source and drain regions on the second surface of the silicon substrate by implanting ions using the gate electrode as an implantation mask; forming a pair of spacers on the sidewalls of the gate electrode; and forming source and drain regions by implanting ions using the gate electrode and the spacers as an implantation mask, wherein the extended source and drain regions formed on the second surface extend towards the trench and are located in between the gate electrode and the trench; and said gate electrode is located directly above the trench.