Methods of anneal after deposition of gate layers
First Claim
1. A method of fabricating a gate structure of a p-type metal-oxide-semiconductor transistor (PMOS) device on a silicon substrate, comprising:
- forming the gate structure on the substrate, wherein the gate structure includes an opening after one or more dummy layers have been removed to form the opening;
forming an interfacial oxide layer on the silicon substrate in the opening;
depositing a high dielectric constant (high-k) dielectric layer over the interfacial oxide layer; and
performing a 2-stage preheat high-temperature anneal to reduce a number of interfacial sites at an interface between the silicon substrate and the interfacial oxide layer and to improve the PMOS negative bias temperature instability (NTBI) performance of the PMOS device, wherein a first stage preheat is performed at a temperature in a range from about 400°
C. to about 600°
C., and wherein a second stage preheat is performed at a temperature in a range from about 700°
C. to about 900°
C., and a high temperature anneal is performed at a peak temperature in a range from 875°
C. to about 1200°
C.
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Abstract
Multi-stage preheat high-temperature anneal processes after the deposition of the gate dielectric layer(s) reduce the number of interfacial sites and improve the negative bias temperature instability (NTBI) performance of a p-type metal-oxide-semiconductor transistor (PMOS). The gate dielectric layers may include an interfacial oxide layer and a high-k dielectric layer. The multi-stage preheat is designed to reduce dopant deactivation and to improve inter-mixing between the interfacial oxide layer and the high-k dielectric layer. The high-temperature anneal is used to reduce the number of interfacial sites at the interface between the silicon substrate and the interfacial oxide layer.
30 Citations
20 Claims
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1. A method of fabricating a gate structure of a p-type metal-oxide-semiconductor transistor (PMOS) device on a silicon substrate, comprising:
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forming the gate structure on the substrate, wherein the gate structure includes an opening after one or more dummy layers have been removed to form the opening; forming an interfacial oxide layer on the silicon substrate in the opening; depositing a high dielectric constant (high-k) dielectric layer over the interfacial oxide layer; and performing a 2-stage preheat high-temperature anneal to reduce a number of interfacial sites at an interface between the silicon substrate and the interfacial oxide layer and to improve the PMOS negative bias temperature instability (NTBI) performance of the PMOS device, wherein a first stage preheat is performed at a temperature in a range from about 400°
C. to about 600°
C., and wherein a second stage preheat is performed at a temperature in a range from about 700°
C. to about 900°
C., and a high temperature anneal is performed at a peak temperature in a range from 875°
C. to about 1200°
C. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method of fabricating a gate structure of a p-type metal-oxide-semiconductor transistor (PMOS) device on a silicon substrate, comprising:
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forming the gate structure on the substrate, wherein the gate structure includes an opening after one or more dummy layers have been removed to form the opening; forming an interfacial oxide layer on the silicon substrate in the opening; depositing a high dielectric constant (high-k) dielectric layer over the interfacial oxide layer; and performing a 2-stage preheat millisecond anneal to reduce a number of interfacial sites at an interface between the silicon substrate and the interfacial oxide layer and to improve the PMOS negative bias temperature instability (NTBI) performance of the PMOS device, wherein a first stage preheat is performed at a temperature in a range from about 400°
C. to about 600°
C. for a duration in a range from about 2 seconds to about 20 seconds, and wherein a second stage preheat is performed at a temperature in a range from about 700°
C. to about 900°
C. for a duration in a range from about 1 second to about 20 seconds, and a millisecond anneal is performed at a peak temperature in a range from 950°
C. to about 1200°
C. for a duration in a range from about 1 ms to about 40 ms. - View Dependent Claims (15, 16, 17, 18)
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19. A method of fabricating a gate structure of a p-type metal-oxide-semiconductor transistor (PMOS) device on a silicon substrate, comprising:
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forming the gate structure on the substrate, wherein the gate structure includes an opening after one or more dummy layers have been removed to form the opening; forming an interfacial oxide layer on the silicon substrate in the opening; depositing a high dielectric constant (high-k) dielectric layer over the interfacial oxide layer; and performing a 2-stage preheat spike anneal to reduce a number of interfacial sites at an interface between the silicon substrate and the interfacial oxide layer and to improve the PMOS negative bias temperature instability (NTBI) performance of the PMOS device, wherein a first stage preheat is performed at a temperature in a range from about 400°
C. to about 600°
C. for a duration in a range from about 2 seconds to about 20 seconds, and wherein a second stage preheat is performed at a temperature in a range from about 700°
C. to about 900°
C. for a duration in a range from about 1 second to about 20 seconds, and a spike anneal is performed at a peak temperature in a range from 875°
C. to about 1010°
C. for a duration in a range from about 0.5 second to about 5 seconds. - View Dependent Claims (20)
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Specification