Patent ID: 7687362
Filing Date: 2010-03-30
Classification: H01L

Abstract:
1. A method for manufacturing a semiconductor device, comprising the steps of: forming an isolation layer in the semiconductor substrate to define an active region that includes a channel portion; first etching the channel portion in the active region; forming a spacer over a side wall of the isolation layer exposed by the first etching of the channel portion in the active region and a side wall of the first etched channel portion; second etching the first etched channel portion, except the edges in a direction of the channel width thereof and the portion of the active region that is not first etched using the spacer as an etching mask so that a U-shape groove is formed in the channel portion of the active region and the entire active region is placed below a upper surface of the isolation layer; removing the spacer; and forming a gate over the channel portion in the active region including the U-shape groove.