Method of fabricating self-aligned contact window which includes forming a undoped polysilicon spacer that extends into a recess of the gate structure
First Claim
1. A method of fabricating a self-aligned contact window, comprising:
- providing a substrate having a gate oxide layer;
forming a conductive layer, a first oxide layer and a first undoped polysilicon layer on the substrate;
patterning the first undoped polysilicon layer, the first oxide layer and the conductive layer to form a gate structure having a surface;
removing a portion of the first oxide layer to form a recess therein;
forming a second oxide layer on the surface of the gate structure;
forming an undoped polysilicon spacer on the sidewall of the gate structure such that the undoped polysilicon spacer extends into the recess of the first oxide layer;
forming a dielectric layer over the substrate; and
forming a self-aligned contact window within the dielectric layer to expose the substrate.
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Accused Products
Abstract
A method of fabricating a self-aligned contact window is described. A gate oxide layer, a conductive layer, a first oxide layer and an undoped polysilicon layer are successively formed on a substrate. These layers above are patterned to form a gate structure. A water clean step is performed, producing a recess in the first oxide layer. A second oxide layer is thermally formed on the surface of the gate structure. An undoped polysilicon spacer is formed on the sidewall of the gate structure and a portion of the undoped polysilicon spacer extends into the recess of the first oxide layer. A dielectric layer is formed over the substrate and using the undoped polysilicon spacer as an etching stop, a self-aligned contact window is formed to expose the source/drain region.
58 Citations
15 Claims
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1. A method of fabricating a self-aligned contact window, comprising:
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providing a substrate having a gate oxide layer; forming a conductive layer, a first oxide layer and a first undoped polysilicon layer on the substrate; patterning the first undoped polysilicon layer, the first oxide layer and the conductive layer to form a gate structure having a surface; removing a portion of the first oxide layer to form a recess therein; forming a second oxide layer on the surface of the gate structure; forming an undoped polysilicon spacer on the sidewall of the gate structure such that the undoped polysilicon spacer extends into the recess of the first oxide layer; forming a dielectric layer over the substrate; and forming a self-aligned contact window within the dielectric layer to expose the substrate. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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Specification