Patent ID: 8987111
Filing Date: 2015-03-24
Classification: H01L

Abstract:
1. A method of fabricating a semiconductor device, comprising: patterning a substrate to form a plurality of line-shaped first grooves extending along a first direction and active lines protruding from the substrate to delimit sidewalls of the first grooves; forming first device isolation layers to fill the first grooves; forming a plurality of line-shaped first mask patterns extending along a second direction on the substrate, the first and second directions crossing each other; etching the first device isolation layers and the active lines using the first mask patterns as an etch mask to form a plurality of second grooves; removing portions of the active lines exposed by the second grooves and spaced apart from each other to form bar-shaped active portions and first holes therebetween, the removing portions of the active lines exposing sidewalls of the first device isolation layers and extending along the first direction; forming second device isolation layers to fill at least portions of the first holes; forming word lines in the second grooves, wherein widths of the second grooves are different from widths of the first holes.