Semiconductor device and manufacturing method thereof
First Claim
Patent Images
1. A semiconductor device having a source and a drain, said device comprising:
- first and second regions as said source and said drain, respectively; and
a gate electrode formed to have a buried gate structure, a portion of said gate electrode being put between said first and second regions,wherein a width of said gate electrode is wider than a gate width of said first and second regions.
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Abstract
A semiconductor device has elements formed on a substrate separately from each other. Each of the elements includes first and second regions as a source and a drain; a gate electrode formed to have a buried gate structure, and a portion of the gate electrode is put between the first and second regions. The width of the gate electrode is wider than the gate width of the first and second regions.
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Citations
20 Claims
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1. A semiconductor device having a source and a drain, said device comprising:
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first and second regions as said source and said drain, respectively; and a gate electrode formed to have a buried gate structure, a portion of said gate electrode being put between said first and second regions, wherein a width of said gate electrode is wider than a gate width of said first and second regions. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method of manufacturing a semiconductor device, comprising:
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forming a conductive region on a semiconductor substrate; performing a first patterning to said conductive layer and said semiconductor substrate by using a first mask to form a gate electrode trench, a device separation trench, and first and second regions; filling said gate electrode trench and said device separation trench with a gate electrode material; forming a resist pattern by using a second mask having a pattern coarser than said first mask; removing said gate electrode material from a part of said gate electrode trench and said device separation trench by said resist pattern; and filing said gate electrode trench part and said device separation trench with an insulating film to form a device separation region. - View Dependent Claims (10, 11, 12, 13, 14)
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15. A method of manufacturing a semiconductor device, comprising:
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forming a conductive region on a semiconductor substrate; performing a first patterning to said conductive layer and said semiconductor substrate by using a first mask to form a gate electrode trench, a device separation trench, and first and second regions; filling said gate electrode trench and said device separation trench with an insulating film to form a device separation region; forming a resist pattern by using a second mask having a pattern coarser than said first mask, to expose a part of said gate electrode trench and a periphery of said gate electrode trench; removing said insulating film from a region not covered by said resist pattern; and filling a gate electrode material in a region from which said insulating film is removed, to form a gate electrode. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification