MEMORY ARRAY WITH ULTRA-THIN ETCHED PILLAR SURROUND GATE ACCESS TRANSISTORS AND BURIED DATA/BIT LINES
First Claim
1. A method of fabricating a memory array comprising:
- forming a plurality of conductive data/bit lines extending generally in a first direction in an upper surface of a semiconductive substrate;
forming a plurality of access transistors extending generally upward from the upper surface of the substrate and aligned generally atop a corresponding data/bit line, wherein forming the access transistors comprises;
forming a pillar extending generally upward from the upper surface of the substrate and generally aligned atop the corresponding data/bit line;
forming a source region generally at a lower portion of the pillar so as to be in electrical communication with the corresponding data/bit line;
forming a drain region generally at an upper portion of the pillar, wherein the pillar intermediate the source and drain regions is substantially fully depleted; and
forming a gate structure substantially about the pillar in lateral directions such that the access transistors are substantially off with no applied gate potential; and
forming a plurality of conductive word lines extending generally in a second direction and in electrical contact with a corresponding gate structure at least a first surface thereof such that bias voltage applied to a given word line is communicated about the corresponding pillar via the gate structure.
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Accused Products
Abstract
A memory array with data/bit lines extending generally in a first direction formed in an upper surface of a substrate and access transistors extending generally upward and aligned generally atop a corresponding data/bit line. The access transistors have a pillar extending generally upward with a source region formed so as to be in electrical communication with the corresponding data/bit line and a drain region formed generally at an upper portion of the pillar and a surround gate structure substantially completely encompassing the pillar in lateral directions and extending substantially the entire vertical extent of the pillar and word lines extending generally in a second direction and in electrical contact with a corresponding surround gate structure at least a first surface thereof such that bias voltage applied to a given word line is communicated substantially uniformly in a laterally symmetric extent about the corresponding pillar via the surround gate structure.
102 Citations
20 Claims
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1. A method of fabricating a memory array comprising:
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forming a plurality of conductive data/bit lines extending generally in a first direction in an upper surface of a semiconductive substrate; forming a plurality of access transistors extending generally upward from the upper surface of the substrate and aligned generally atop a corresponding data/bit line, wherein forming the access transistors comprises; forming a pillar extending generally upward from the upper surface of the substrate and generally aligned atop the corresponding data/bit line; forming a source region generally at a lower portion of the pillar so as to be in electrical communication with the corresponding data/bit line; forming a drain region generally at an upper portion of the pillar, wherein the pillar intermediate the source and drain regions is substantially fully depleted; and forming a gate structure substantially about the pillar in lateral directions such that the access transistors are substantially off with no applied gate potential; and forming a plurality of conductive word lines extending generally in a second direction and in electrical contact with a corresponding gate structure at least a first surface thereof such that bias voltage applied to a given word line is communicated about the corresponding pillar via the gate structure. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method of fabricating a memory array comprising:
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forming a plurality of access transistors extending generally upward from an upper surface of a semiconductor substrate and aligned in association with a corresponding data/bit line, wherein forming the access transistors comprises; forming a pillar; forming a source region generally at a lower portion of the pillar so as to be in electrical communication with the corresponding data/bit line; forming a drain region generally at an upper portion of the pillar, wherein at least a portion of the pillar intermediate the source and drain regions is depleted; and forming a gate structure substantially about the pillar such that the access transistors are substantially off with no applied gate potential; and forming a plurality of conductive word lines, each of the conductive word lines in electrical contact with a corresponding gate structure at least a first surface thereof such that bias voltage applied to a given word line is communicated about the corresponding pillar via the gate structure. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification