METHOD OF FABRICATING NMOS DEVICES
First Claim
1. A method of fabricating n-channel metal-oxide-semiconductor (NMOS) devices, the method comprising the steps of:
- providing a substrate having a plurality of NMOS structures formed thereon;
depositing a silicon nitride layer having a high tensile stress over the substrate; and
sequentially exposing and dry etching a plurality of portions of the silicon nitride layer in an order of channel lengths of the plurality of NMOS structures such that each portion of the etched silicon nitride layer has a thickness proportional to the channel length of its corresponding NMOS structure.
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Accused Products
Abstract
A method of fabricating n-channel metal-oxide-semiconductor (NMOS) devices is disclosed, the method including: providing a substrate having a plurality of NMOS structures formed thereon; depositing a silicon nitride layer having a high tensile stress over the substrate; and sequentially exposing and dry etching a plurality of portions of the silicon nitride layer in an order of channel lengths of the plurality of NMOS structures such that each portion of the etched silicon nitride layer has a thickness proportional to the channel length of its corresponding NMOS structure. Compared to a conventional method, the above fabrication method of NMOS devices can achieve uniform performance adjustment of NMOS devices after a silicon nitride layer with a high tensile stress is deposited.
4 Citations
8 Claims
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1. A method of fabricating n-channel metal-oxide-semiconductor (NMOS) devices, the method comprising the steps of:
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providing a substrate having a plurality of NMOS structures formed thereon; depositing a silicon nitride layer having a high tensile stress over the substrate; and sequentially exposing and dry etching a plurality of portions of the silicon nitride layer in an order of channel lengths of the plurality of NMOS structures such that each portion of the etched silicon nitride layer has a thickness proportional to the channel length of its corresponding NMOS structure. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification