Method of forming low-leakage dielectric layer
First Claim
1. A method of forming a node dielectric for a capacitor, the method comprising:
- a. forming a nitride film on a semiconductor surface;
b. oxidizing at least a portion of the nitride film; and
c. nitriding at least a portion of the oxidized nitride film.
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Accused Products
Abstract
Two new processes are disclosed for forming a high quality dielectric layer. A first process includes a re-nitridation step following the oxidation of an SiN film in the formation of a dielectric layer. A second process includes a sequential nitridation step to form a SiN film in the formation of a dielectric layer. In a particular embodiment of the second process, sequential ammonia annealing at elevated temperatures is used to bake sequentially deposited thin nitride layers. By using these methods, dielectric films with higher capacitance and lower leakage current have been obtained. The methods described herein have been applied to a deep trench capacitor array, but is equally applicable for other device dielectrics including, but not limited to, stacked capacitor DRAMs.
63 Citations
20 Claims
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1. A method of forming a node dielectric for a capacitor, the method comprising:
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a. forming a nitride film on a semiconductor surface;
b. oxidizing at least a portion of the nitride film; and
c. nitriding at least a portion of the oxidized nitride film. - View Dependent Claims (2, 3, 4, 5)
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6. A method of forming a node dielectric for a capacitor, the method comprising:
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a. depositing a first thin nitride film on a semiconductor surface;
b. baking the first thin nitride film at an elevated temperature;
c. depositing a second thin nitride film on the first nitride film; and
d. baking the second thin nitride film at an elevated temperature. - View Dependent Claims (7, 8, 9, 10, 11, 12, 13)
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14. A method of forming a node dielectric for a capacitor, the method comprising:
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a. depositing a first thin nitride film on a semiconductor surface;
b. nitriding at least a portion of the first thin nitride film;
c. depositing a second thin nitride film on the nitrided first nitride film; and
d. nitriding at least a portion of the second thin nitride film. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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Specification