Method of forming a silicon gate to produce silicon devices with improved performance
First Claim
1. A method of forming a silicon gate stack over a silicon substrate of a semiconductor device, the method comprising the steps of:
- growing an oxide layer over the silicon substrate;
depositing a thin layer of silicon in the absence of impurities to form a thin layer of silicon over the oxide layer;
depositing a thick layer of silicon over the thin layer of silicon, the thick layer having a greater thickness than the thin layer;
introducing impurities into only the thick layer of silicon to form a silicon gate which includes the thin layer of silicon having no impurities and the thick layer of silicon having the impurities, the impurities being introduced with a concentration; and
applying a protective screen oxide layer around the silicon gate stack, the impurities concentration and the thick layer thickness impeding an encroachment by the oxide layer into the silicon gate during application of the protective screen oxide layer around the silicon gate stack.
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Accused Products
Abstract
Disclosed herein is a method of forming a silicon gate stack onto a silicon substrate for a silicon device. The method of forming the silicon gate stack comprises the steps of growing an oxide layer onto the silicon substrate, depositing a thin layer of silicon to form a thin layer of silicon over the oxide layer, depositing a thick layer of silicon over the thin layer of silicon, and introducing impurities into only the thick layer of silicon to form a silicon gate whereby the silicon gate includes the thin layer of silicon and the thick layer of silicon having the impurities. The impurities being introduced with a concentration, the impurities concentration and the thick layer thickness impeding an encroachment by the oxide layer into the silicon gate during application of a protective screen oxide layer around the silicon gate stack.
31 Citations
8 Claims
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1. A method of forming a silicon gate stack over a silicon substrate of a semiconductor device, the method comprising the steps of:
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growing an oxide layer over the silicon substrate; depositing a thin layer of silicon in the absence of impurities to form a thin layer of silicon over the oxide layer; depositing a thick layer of silicon over the thin layer of silicon, the thick layer having a greater thickness than the thin layer; introducing impurities into only the thick layer of silicon to form a silicon gate which includes the thin layer of silicon having no impurities and the thick layer of silicon having the impurities, the impurities being introduced with a concentration; and applying a protective screen oxide layer around the silicon gate stack, the impurities concentration and the thick layer thickness impeding an encroachment by the oxide layer into the silicon gate during application of the protective screen oxide layer around the silicon gate stack. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method of forming a silicon gate stack over a silicon substrate of a semiconductor device, the method comprising the steps of:
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growing an oxide layer over the silicon substrate; depositing a thin layer of silicon in the absence of impurities to form a thin layer of silicon over the oxide layer; depositing a thick layer of silicon over the thin layer of silicon, the thick layer having a greater thickness than the thin layer; introducing impurities into the thick layer of silicon by doping the thick layer of silicon with nitrogen or carbon, the nitrogen being introduced including in the form of an ammonia gas (NH3), to form a silicon gate which includes the thin layer of silicon and the thick layer of silicon having the impurities; and applying a protective screen oxide layer around the silicon gate stack, the impurities being introduced with a concentration, the impurities concentration and the thick layer thickness impeding an encroachment by the oxide layer into the silicon gate during application of the protective screen oxide layer around the silicon gate stack.
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8. A method of forming a silicon gate stack over a silicon substrate of a semiconductor device, the method comprising the steps of:
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growing an oxide layer over the silicon substrate; depositing a thin layer of silicon in the absence of impurities to form a thin layer of silicon over the oxide layer; depositing a thick layer of silicon over the thin layer of silicon in the absence of impurities, the thick layer having a greater thickness than the thin layer; introducing impurities into only one of the thin layer or the thick layer of silicon to form a silicon gate which includes the thin layer of silicon and the thick layer of silicon one of which having the impurities, the impurities being introduced with a concentration; and applying a protective screen oxide layer around the silicon gate stack, the impurities concentration and the thick layer thickness impeding an encroachment by the oxide layer into the silicon gate during application of the protective screen oxide layer around the silicon gate stack.
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Specification