METHOD OF FORMING A SPACER
First Claim
1. A method of forming a spacer, comprising:
- forming on a substrate a pattern structure having a sidewall which is substantially upright with respect to the substrate;
forming a spacer formation layer over the structure such that a portion of the spacer formation layer extends along the sidewall of the structure;
forming a sacrificial layer on the spacer formation layer;
forming a sacrificial layer pattern covering the portion of the spacer formation layer which extends along the sidewall of the pattern structure, wherein the forming of the sacrificial layer pattern comprises anisotropically etching the sacrificial layer using a wet etching solution; and
forming a spacer on the sidewall of the pattern structure by etching the spacer formation layer using the sacrificial layer pattern as a mask.
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Accused Products
Abstract
A sacrificial layer and wet etch are used to form a sidewall spacer so as to prevent damage to the structure on which the spacer is formed and to the underlying substrate as well. Once the structure is formed on the substrate a spacer formation layer is formed to cover the structure, and a sacrificial layer is formed on the spacer formation layer. The sacrificial layer is wet etched to form a sacrificial layer pattern on that portion of the spacer formation layer extending along a sidewall of the structure. The spacer is formed on the sidewall of the structure by wet etching the spacer formation layer using the sacrificial layer pattern as a mask.
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Citations
12 Claims
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1. A method of forming a spacer, comprising:
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forming on a substrate a pattern structure having a sidewall which is substantially upright with respect to the substrate; forming a spacer formation layer over the structure such that a portion of the spacer formation layer extends along the sidewall of the structure; forming a sacrificial layer on the spacer formation layer; forming a sacrificial layer pattern covering the portion of the spacer formation layer which extends along the sidewall of the pattern structure, wherein the forming of the sacrificial layer pattern comprises anisotropically etching the sacrificial layer using a wet etching solution; and forming a spacer on the sidewall of the pattern structure by etching the spacer formation layer using the sacrificial layer pattern as a mask. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method of forming a spacer, comprising:
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forming on a substrate a pattern structure having a sidewall which is substantially upright with respect to the substrate; forming a spacer formation layer over the pattern structure such that a portion of the spacer formation layer extends along the sidewall of the pattern structure; forming a sacrificial layer pattern covering the portion of the spacer formation layer which extends along the sidewall of the pattern structure; and forming a spacer on the sidewall of the pattern structure by soaking portions of the spacer formation layer exposed by the sacrificial layer pattern with a wet etching solution. - View Dependent Claims (8, 9, 10, 11)
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12-20. -20. (canceled)
Specification