Semiconductor devices comprising nitrogen-doped gate dielectric, and methods of forming semiconductor devices
First Claim
1. A method of forming a semiconductor device comprising:
- forming a gate dielectric layer extending across a location of a channel region of a PMOS transistor and across a location of a channel region of an NMOS transistor;
doping a first region of the gate dielectric layer with nitrogen to a first concentration;
after doping the first region of the gate dielectric layer with the nitrogen to the first concentration, doping a second region of the gate dielectric layer with nitrogen to a second concentration different from the first concentration;
one of the nitrogen-doped first and second regions of the gate dielectric layer including a nitrogen-doped NMOS gate dielectric material over and in direct physical contact with the channel region location of the NMOS transistor, and the other of the nitrogen-doped first and second regions of the gate dielectric layer including a nitrogen-doped PMOS gate dielectric material over and in direct physical contact with the channel region location of the PMOS transistor; and
the nitrogen-doped NMOS gate dielectric material being doped to a higher concentration of nitrogen than the nitrogen-doped PMOS gate dielectric material.
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Abstract
Some embodiments include semiconductor devices having first transistors of a first channel type and having second transistors of a second channel type. The first transistors include a first gate electrode, a first nitrogen-doped gate dielectric layer and a first high-k material. The second transistors include a second gate electrode, a second nitrogen-doped gate dielectric layer and a second high-k material. The second nitrogen-doped gate dielectric layer is doped with nitrogen to a different peak concentration than the first nitrogen-doped gate dielectric layer. Some embodiments include methods of forming PMOS and NMOS transistors having nitrogen-doped gate dielectric material.
4 Citations
20 Claims
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1. A method of forming a semiconductor device comprising:
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forming a gate dielectric layer extending across a location of a channel region of a PMOS transistor and across a location of a channel region of an NMOS transistor; doping a first region of the gate dielectric layer with nitrogen to a first concentration; after doping the first region of the gate dielectric layer with the nitrogen to the first concentration, doping a second region of the gate dielectric layer with nitrogen to a second concentration different from the first concentration;
one of the nitrogen-doped first and second regions of the gate dielectric layer including a nitrogen-doped NMOS gate dielectric material over and in direct physical contact with the channel region location of the NMOS transistor, and the other of the nitrogen-doped first and second regions of the gate dielectric layer including a nitrogen-doped PMOS gate dielectric material over and in direct physical contact with the channel region location of the PMOS transistor; andthe nitrogen-doped NMOS gate dielectric material being doped to a higher concentration of nitrogen than the nitrogen-doped PMOS gate dielectric material. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A method of forming a semiconductor device comprising:
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forming a gate dielectric material extending across a location of a channel region of a PMOS transistor and across a location of a channel region of an NMOS transistor; doping the gate dielectric material across the channel region of the PMOS transistor with nitrogen to a first concentration, thereby forming a first nitrogen doped region in direct physical contact with the channel region of the PMOS transistor; doping the gate dielectric material across the channel region of the NMOS transistor to a second concentration that is at least about 30% greater than the first concentration, thereby forming a second nitrogen doped region in direct physical contact with the channel region of the NMOS transistor; forming a first oxide over the gate dielectric material; forming a second oxide over the second oxide; forming a metal-containing composition over the second oxide; and wherein the PMOS transistor includes both the first oxide and the second oxide, and wherein the NMOS transistor comprises only the first oxide between the gate dielectric material and the metal-containing composition. - View Dependent Claims (20)
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Specification