Circuits and methods using vertical, complementary transistors
First Claim
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1. An inverter, comprising:
- a first vertically configured transistor formed within a first vertically configured structure extending outwardly from, a semiconductor substrate;
a second vertically configured transistor formed within a second vertically configured structure extending outwardly from a semiconductor substrate;
an electrical contact between source/drain regions of the first and second vertically configured transistors to provide an output for the inverter; and
a shared gate contact located adjacent to the body regions of the first and the second vertically configured transistors, the shared gate contact interconnecting the vertically configured transistors wherein the gate contact comprises an input to the inverter.
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Abstract
A method and structure for an improved, vertically configured inverter array is provided. The inverter includes a buried gate contact coupling the body regions of a complementary pair of transistors. An electrical contact couples the second source/drain regions of the complementary pair of transistors. The transistors are formed in vertical pillars of single crystalline semiconductor material.
138 Citations
21 Claims
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1. An inverter, comprising:
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a first vertically configured transistor formed within a first vertically configured structure extending outwardly from, a semiconductor substrate;
a second vertically configured transistor formed within a second vertically configured structure extending outwardly from a semiconductor substrate;
an electrical contact between source/drain regions of the first and second vertically configured transistors to provide an output for the inverter; and
a shared gate contact located adjacent to the body regions of the first and the second vertically configured transistors, the shared gate contact interconnecting the vertically configured transistors wherein the gate contact comprises an input to the inverter.
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2. A method of fabricating an inverter, comprising:
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forming a first vertically configured transistor, the first transistor extending outwardly from a semiconductor substrate;
forming a second vertically configured transistor, the second transistor extending outwardly from a semiconductor substrate;
forming an electrical contact between source/drain regions of the first and second vertically configured transistors to provide an output for the inverter; and
forming a single gate contact, the gate contact located adjacent to the body regions of the first and second vertically configured transistors wherein the gate contact comprises an input to the inverter.- View Dependent Claims (3, 4, 5, 6)
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7. A method of fabricating an inverter, comprising:
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forming a first transistor in a first pillar of single crystalline semiconductor material that extends outwardly from the substrate, the first pillar having a number of sides, the first transistor having a body region and first and second source/drain regions that are vertically aligned, the first transistor further having a gate that is associated with a side of the first transistor and adjacent to the body region of the first transistor;
forming a second transistor in a second pillar of single crystalline semiconductor material that extends outwardly from the substrate, the second pillar having a number of sides, the second transistor having a body region and first and second source/drain regions that are vertically aligned, the second transistor further having a gate that is associated with a side of the second transistor and adjacent to the body region of the second transistor forming a single, shared gate contact located adjacent to the gates and the the body regions of both first and second transistors; and
forming a metal contact between the first source/drain regions of the first and second transistor types. - View Dependent Claims (8, 9, 10, 11)
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12. A method of fabricating an array of inverters, comprising:
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forming multiple complementary pairs of transistors extending outwardly from a semiconductor substrate and having upper surfaces, each transistor in a pair having a vertically stacked body region and a first and second source/drain regions, each transistor further having a gate;
forming an electrical contact between the transistors in each complementary pair;
forming a plurality of isolation trenches extending parallel to and between the multiple complementary pairs of transistors; and
forming a shared gate contact adjacent to the slates and the body regions in each complementary pair of transistors, and wherein the gate contact communicates with the body region of each transistor in the pair. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19)
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20. A method of fabricating an array, comprising:
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forming alternating first source/drain region layers of differently doped semiconductor material extending outwardly from a semiconductor substrate;
forming alternating body region layers of differently doped semiconductor material on the first source/drain region layer;
forming alternating second source/drain region layers of differently doped semiconductor material on the body region layers;
forming a plurality of isolation trenches so as to form isolated pillars of semiconductor material, each including a first source/drain region, a body region and a second source/drain region for a transistor;
forming a gate contact disposed within at least one of the plurality of trenches, wherein the gate contact couples body regions of a complementary pair of transistors; and
connecting the second source/drain regions of the complementary transistors to form an inverter.
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21. A method of fabricating an array of inverters, comprising:
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implanting ions into a semiconductor substrate in an alternating parallel pattern so as to form alternating bars of differently doped semiconductor material;
selectively growing, upon the alternating bars, multiple epitaxial layers of differently doped silicon in order to create an alternating parallel pattern of differently doped vertically configured silicon material;
forming a plurality of orthogonally bisecting isolation trenches to form a pattern of differently doped vertically configured silicon pillars;
forming electrical contacts between complementary pairs of the differently doped vertically configured silicon pillars; and
forming gate contacts within at least one of the plurality of orthogonally bisecting isolation trenches that interconnects complementary pairs of differently doped vertically configured silicon pillars.
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Specification