SRAM and logic transistors with variable height multi-gate transistor architecture
First Claim
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1. An apparatus comprising:
- a first multi-gate transistor having a non-planar semiconductor body with first sidewall height; and
a second multi-gate transistor having a non-planar semiconductor body with a second sidewall height, wherein the first multi-gate transistor is in an SRAM cell of a microprocessor.
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Abstract
Multi-gate transistors having different channel widths formed on non-planar semiconductor bodies have different sidewall heights and method of manufacturing the same. In an embodiment, a multi-gate SRAM transistor is formed on a non-planar semiconductor body having a greater sidewall height than a non-planar semiconductor body utilized for a multi-gate logic transistor to improve performance of SRAM and logic transistors formed on the same substrate. In another embodiment, to reduce cell area, a first SRAM transistor is formed on a non-planar semiconductor body having a greater sidewall height than a non-planar semiconductor body utilized for a second multi-gate SRAM transistor.
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Citations
20 Claims
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1. An apparatus comprising:
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a first multi-gate transistor having a non-planar semiconductor body with first sidewall height; and a second multi-gate transistor having a non-planar semiconductor body with a second sidewall height, wherein the first multi-gate transistor is in an SRAM cell of a microprocessor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An apparatus comprising:
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a multi-gate SRAM transistor in an integrated circuit having a first non-planar semiconductor body sidewall height and a first non-planar semiconductor body width; and a multi-gate logic transistor in the integrated circuit having a second non-planar semiconductor body sidewall height and a second width; and
, wherein the first non-planar semiconductor body sidewall height is greater than the second non-planar semiconductor body sidewall height. - View Dependent Claims (10, 11, 12)
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13. A method of forming a multi-gate SRAM transistor comprising:
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forming first isolation region on a bulk semiconductor substrate adjacent to and planar with a pull-down SRAM transistor semiconductor body; forming a second isolation region on the bulk semiconductor substrate adjacent to and planar with a second semiconductor body; performing a first etch on both the first isolation region and the second isolation region to expose at least a portion of the sidewalls of both the SRAM transistor semiconductor body and the second transistor semiconductor body; masking the second isolation region; performing a second etch on the first isolation region to expose an additional portion of the SRAM transistor semiconductor body sidewalls; forming a first gate insulator adjacent to the exposed portion of the sidewalls of the pull-down SRAM transistor semiconductor body and forming a second gate insulator adjacent to the exposed portion of the sidewalls of the second transistor semiconductor body; forming a first gate electrode adjacent to the first gate insulator and forming a second gate electrode adjacent to the second gate insulator; and forming a first pair of source/drain regions on opposite sides of the first gate electrode and a second pair of source/drain regions on opposite sides of the second gate electrode. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20)
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Specification