SEMICONDUCTOR MEMORY DEVICE AND METHOD OF FABRICATING THE SAME
First Claim
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1. A semiconductor memory device comprising:
- a semiconductor substrate;
a first contact plug and a second contact plug provided on the semiconductor substrate; and
a first bit line being in contact with the first contact plug, and a second bit line provided on the second contact plug,wherein the first contact plug is in contact with a top surface of the first bit line and is electrically insulated from the second bit line, anda bottom surface of the second bit line is higher in height than the top surface of the first bit line.
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Abstract
According to one embodiment, a semiconductor memory device comprises: a semiconductor substrate; a first contact plug and a second contact plug on the semiconductor substrate; a first bit line being in contact with the first contact plug; and a second bit line on the second contact plug, wherein the first contact plug is in contact with a top surface of the first bit line and is electrically insulated from the second bit line, and a bottom surface of the second bit line is higher in height than the top surface of the first bit line.
14 Citations
17 Claims
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1. A semiconductor memory device comprising:
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a semiconductor substrate; a first contact plug and a second contact plug provided on the semiconductor substrate; and a first bit line being in contact with the first contact plug, and a second bit line provided on the second contact plug, wherein the first contact plug is in contact with a top surface of the first bit line and is electrically insulated from the second bit line, and a bottom surface of the second bit line is higher in height than the top surface of the first bit line. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method of fabricating a semiconductor memory device, comprising:
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forming a first insulating film on a semiconductor substrate; forming a second insulating film on the first insulating film; processing the second insulating film to form a first wiring trench; forming a first bit line in the first wiring trench; forming a third insulating film on the second insulating film and the first bit line; processing the third insulating film, the second insulating film, and the first insulating film to form a first contact hole and a second contact hole and also to expose a top surface of the first bit line through the first contact hole; burying a first contact plug into the first contact hole, and a second contact plug into the second contact hole; forming a fourth insulating film on the third insulating film, the first contact plug, and the second contact plug; processing the fourth insulating film to form a second wiring trench on the second contact plug; and forming a second bit line in the second wiring trench. - View Dependent Claims (13, 14, 15, 16, 17)
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Specification