Spacers with rectangular profile and methods of forming the same
First Claim
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1. A device comprising:
- a semiconductor substrate;
a gate stack over the semiconductor substrate;
a gate spacer on a sidewall of the gate stack, wherein the gate spacer comprises;
an inner portion having an inner sidewall contacting the sidewall of the gate stack; and
an outer portion comprising;
an inner edge contacting an outer edge of the inner portion, wherein the inner portion and the outer portion of the gate spacer are formed of different materials, wherein an entirety of the outer portion is offset from the inner portion; and
a bottom surface over and spaced apart from the semiconductor substrate; and
a source/drain region adjacent to the gate spacer, wherein an inner edge of the source/drain region is flushed with an outer edge of the outer portion, and wherein no source/drain extension region exists between the inner edge of the source/drain region and the outer edge of the inner portion of the gate spacer.
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Abstract
A method includes forming a spacer layer on a top surface and sidewalls of a patterned feature, wherein the patterned feature is overlying a base layer, A protection layer is formed to contact a top surface and a sidewall surface of the spacer layer. The horizontal portions of the protection layer are removed, wherein vertical portions of the protect layer remain after the removal. The spacer layer is etched to remove horizontal portions of the spacer layer, wherein vertical portions of the spacer layer remain to form parts of spacers.
36 Citations
20 Claims
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1. A device comprising:
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a semiconductor substrate; a gate stack over the semiconductor substrate; a gate spacer on a sidewall of the gate stack, wherein the gate spacer comprises; an inner portion having an inner sidewall contacting the sidewall of the gate stack; and an outer portion comprising; an inner edge contacting an outer edge of the inner portion, wherein the inner portion and the outer portion of the gate spacer are formed of different materials, wherein an entirety of the outer portion is offset from the inner portion; and a bottom surface over and spaced apart from the semiconductor substrate; and a source/drain region adjacent to the gate spacer, wherein an inner edge of the source/drain region is flushed with an outer edge of the outer portion, and wherein no source/drain extension region exists between the inner edge of the source/drain region and the outer edge of the inner portion of the gate spacer. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A device comprising:
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a substrate; a first gate spacer and a second gate spacer over the substrate; a gate stack between and contacting the first gate spacer and the second gate spacer; a first dielectric layer contacting a sidewall of the first gate spacer, wherein the first dielectric layer is vertically spaced apart from the substrate, and an entirety of the first dielectric layer does not overlap the first gate spacer; a second dielectric layer comprising; a top portion having a bottom surface contacting a top surface of the first dielectric layer; a middle portion having a sidewall contacting a sidewall of the first dielectric layer; and a bottom portion having a top surface contacting a bottom surface of the first dielectric layer, wherein the middle portion is continuously connected to the top portion and the bottom portion with no distinguishable interface therebetween; and a source/drain region extending into the substrate, wherein an inner edge of the source/drain region is flushed with an outer edge of the first dielectric layer, with the first dielectric layer not overlapping the source/drain region, and the inner edge of the source/drain region is spaced apart from the first gate spacer by a space, and no source/drain extension region is formed in the space. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A device comprising:
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a semiconductor substrate; a gate spacer having an outer edge and an inner edge, wherein the outer edge is straight and extends to contact the semiconductor substrate; a gate stack having an edge contacting the inner edge of the gate spacer; a first dielectric layer contacting an upper portion of the outer edge of the gate spacer, wherein the first dielectric layer has a bottom higher than a bottom of the outer edge of the gate spacer, and an entirety of the first dielectric layer is formed of a polymer; a second dielectric layer comprising; a top portion having a bottom surface contacting a top surface of the first dielectric layer; a middle portion having a sidewall contacting a sidewall of the first dielectric layer; and a bottom portion having a top surface contacting a bottom surface of the first dielectric layer, wherein the middle portion is continuously connected to the top portion and the bottom portion with no distinguishable interface therebetween; and a source/drain region, wherein an inner edge of the source/drain region is flushed with an outer edge of the first dielectric layer, with the first dielectric layer not overlapping the source/drain region, and the inner edge of the source/drain region is spaced apart from the gate spacer by a space, and no source/drain extension region is formed in the space. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification