Independently accessed double-gate and tri-gate transistors in same process flow
First Claim
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1. A method comprising:
- forming a first transistor on a substrate having a first body surrounded on three sides by a first metal gate; and
forming a second transistor on the substrate having a second body having two independent metal gates on opposite sides of the second body, and an insulative member formed on the second body, the insulative member formed between the two independent metal gates, wherein the first and second transistors are formed in a same process flow.
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Abstract
A method for fabricating double-gate and tri-gate transistors in the same process flow is described. In one embodiment, a sacrificial layer is formed over stacks that include semiconductor bodies and insulative members. The sacrificial layer is planarized prior to forming gate-defining members. After forming the gate-defining members, remaining insulative member portions are removed from above the semiconductor body of the tri-gate device but not the I-gate device. This facilitates the formation of metallization on three sides of the tri-gate device, and the formation of independent gates for the I-gate device.
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20 Claims
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1. A method comprising:
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forming a first transistor on a substrate having a first body surrounded on three sides by a first metal gate; and forming a second transistor on the substrate having a second body having two independent metal gates on opposite sides of the second body, and an insulative member formed on the second body, the insulative member formed between the two independent metal gates, wherein the first and second transistors are formed in a same process flow. - View Dependent Claims (2, 3, 4, 5)
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6. A method comprising:
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forming at least two semiconductor bodies from a semiconductor layer; forming an insulative member on the second semiconductor body; patterning a dielectric layer to form two gate dielectric layers on the two semiconductor bodies; and forming a conductive layer to form a first metal gate surrounding on three sides of the first semiconductor body and two independent metal gates on opposite sides of the second semiconductor body, the insulative member formed between the two independent metal gates, wherein the semiconductor bodies, the gate dielectric layers and the metal gates are formed in a same process step. - View Dependent Claims (7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. An integrated circuit formed by a process that includes:
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forming a first transistor on a substrate having a first body surrounded on three sides by a first metal gate; and forming a second transistor on the substrate having a second body having two independent metal gates on opposite sides of the second body, and an insulative member formed on the second body, the insulative member is formed between the two independent metal gates, wherein the first and second transistors are formed in a same process flow. - View Dependent Claims (17, 18, 19, 20)
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Specification