Semiconductor device and manufacturing method thereof
First Claim
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1. A semiconductor device manufacturing method comprising:
- forming, on an insulating layer, a plurality of first mask layers and a second mask layer which is arranged between the first mask layers and has a width larger than that of a first mask layer, the first mask layers and the second mask layer being arrayed at equal spaces;
reducing a width of each of the first mask layers and the second mask layer by selectively etching the first mask layers and the second mask layer;
forming a plurality of sidewalls on side surfaces of the first mask layers and the second mask layer;
removing the first mask layers and the second mask layer to leave the sidewalls;
selectively etching the insulating layer using the sidewalls as a mask to form, in the insulating layer, a plurality of first trenches and a second trench which is arranged between the first trenches and has a width larger than that of a first trench; and
burying a conductor in the first trenches and the second trench to form, in the insulating layer, a plurality of first interconnection layers and a second interconnection layer having a width larger than that of a first interconnection layer.
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Abstract
A semiconductor device includes a plurality of first interconnection layers which are provided in an insulating layer and formed in a pattern having a width and space smaller than a resolution limit of an exposure technique, and a second interconnection layer which is provided between the first interconnection layers in the insulating layer and has a width larger than that of a first interconnection layer. A space between the second interconnection layer and each of first interconnection layers adjacent to both sides of the second interconnection layer equals the space between the first interconnection layers.
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11 Claims
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1. A semiconductor device manufacturing method comprising:
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forming, on an insulating layer, a plurality of first mask layers and a second mask layer which is arranged between the first mask layers and has a width larger than that of a first mask layer, the first mask layers and the second mask layer being arrayed at equal spaces; reducing a width of each of the first mask layers and the second mask layer by selectively etching the first mask layers and the second mask layer; forming a plurality of sidewalls on side surfaces of the first mask layers and the second mask layer; removing the first mask layers and the second mask layer to leave the sidewalls; selectively etching the insulating layer using the sidewalls as a mask to form, in the insulating layer, a plurality of first trenches and a second trench which is arranged between the first trenches and has a width larger than that of a first trench; and burying a conductor in the first trenches and the second trench to form, in the insulating layer, a plurality of first interconnection layers and a second interconnection layer having a width larger than that of a first interconnection layer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification