Process for manufacturing dual work function metal gates in a microelectronics device
First Claim
1. A process for forming a dual work function metal gate microelectronics device, comprising:
- forming a stacked gate structure in each of a pMOS region and an nMOS region of a microelectronics substrate, the gate structure comprising a gate dielectric, a first metal layer located over the gate dielectric and a sacrificial gate layer located over the first metal layer;
removing the sacrificial gate layer in at least one of the nMOS or pMOS regions, thereby forming a gate opening; and
modifying the first metal layer within the gate opening to form a gate electrode with a desired work function.
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Abstract
The present invention provides a method of forming a dual work function metal gate microelectronics device 200. In one aspect, the method includes forming nMOS and pMOS stacked gate structures 315a and 315b. The nMOS and pMOS stacked gate structures 315a and 315b each comprise a gate dielectric 205, a first metal layer, 305 located over the gate dielectric 205 and a sacrificial gate layer 310 located over the first metal layer 305. The method further includes removing the sacrificial gate layer 310 in at least one of the nMOS or pMOS stacked gate structures, thereby forming a gate opening 825 and modifying the first metal layer 305 within the gate opening 825 to form a gate electrode with a desired work function.
423 Citations
25 Claims
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1. A process for forming a dual work function metal gate microelectronics device, comprising:
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forming a stacked gate structure in each of a pMOS region and an nMOS region of a microelectronics substrate, the gate structure comprising a gate dielectric, a first metal layer located over the gate dielectric and a sacrificial gate layer located over the first metal layer;
removing the sacrificial gate layer in at least one of the nMOS or pMOS regions, thereby forming a gate opening; and
modifying the first metal layer within the gate opening to form a gate electrode with a desired work function. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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25. A process for forming an integrated circuit having dual work function metal gates, comprising:
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forming transistors over a microelectronics substrate, comprising;
building a transistor gate, comprising;
forming a stacked gate structure in each of a pMOS region and an nMOS region of a microelectronics substrate, the gate structure comprising a gate dielectric, a first metal layer located over the gate dielectric and a sacrificial gate layer located over the first metal layer;
removing the sacrificial gate layer in at least one of the nMOS or pMOS regions, thereby forming a gate opening; and
modifying the first metal layer within the gate opening to form a gate electrode with a desired work function;
forming source/drains in the microelectronics substrate prior to removing the sacrificial gate layer; and
forming interconnects in dielectric layers located over the transistors to interconnect the transistors and form an operative integrated circuit.
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Specification