Patent ID: 8034682
Filing Date: 2011-10-11
Classification: H01L,Y10S

Abstract:
1. A method of forming a semiconductor device, comprising: removing portions of a silicon layer such that a plurality of trenches are formed each having sidewalls which fan out near the top of the trench to extend directly over a portion of the silicon layer adjacent each trench sidewall; forming a first insulating layer lining the trench sidewalls; forming a gate electrode partially filling each trench; forming a second insulating layer in each trench, the second insulating layer extending over each gate electrode and over the portions of the silicon layer which extend directly under the trench sidewalls; and removing exposed silicon to expose an edge of the first insulating layer in each trench, the exposed edge of the first insulating layer in each trench defining a portion of each contact opening formed between every two adjacent trenches.