Patent ID: 8927353
Filing Date: 2015-01-06
Classification: H01L

Abstract:
1. A method of forming a fin field effect transistor, comprising: providing a semiconductor substrate; forming a first masking layer overlying the semiconductor substrate; forming a second masking layer overlying the first masking layer; forming a photoresist pattern with a first width overlying the second masking layer; etching the second masking layer while using the photoresist pattern as a first etch mask; trimming the photoresist pattern to form a trimmed photoresist pattern with a second width smaller than the first width; etching the second masking layer and the first masking layer while using the trimmed photoresist pattern as a second etch mask to form a stacked mask comprising the first masking layer and the second masking layer; etching the semiconductor substrate to form a fin structure between two trenches; removing the second masking layer; forming a gate dielectric layer along sidewalls of the fin structure; and forming a gate electrode covering the first masking layer and the gate dielectric layer.