Vertical field effect transistor including extension and stressors
First Claim
1. A method of inducing strain on a channel region of a vertical transistor, the method comprising:
- forming a channel region that extends from a first source/drain region to a second source/drain region;
encapsulating a first portion of the channel region with a first encapsulating structure and a second portion of the channel region with a second encapsulating structure;
removing the second encapsulating structure while maintaining the first encapsulating structure to expose the second portion of the channel region; and
replacing the second portion of the channel region with a stressor region that induces a strain on the first portion of the channel region.
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Accused Products
Abstract
A vertical field effect transistor (FET) includes a first source/drain region formed on an upper surface of a semiconductor substrate, and a semiconductor channel material that extends vertically from the first source/drain region to a second source/drain region. A metal gate structure encapsulating the semiconductor channel material. The vertical FET further includes a stressor region that contacts the semiconductor channel material and the first source/drain region. The combination of the semiconductor channel material and the stressor region defines a total length of a strained channel region of the vertical field effect transistor.
23 Citations
15 Claims
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1. A method of inducing strain on a channel region of a vertical transistor, the method comprising:
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forming a channel region that extends from a first source/drain region to a second source/drain region; encapsulating a first portion of the channel region with a first encapsulating structure and a second portion of the channel region with a second encapsulating structure; removing the second encapsulating structure while maintaining the first encapsulating structure to expose the second portion of the channel region; and replacing the second portion of the channel region with a stressor region that induces a strain on the first portion of the channel region. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 10)
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9. A method of inducing a strain on a channel region of a vertical field effect transistor (FET), the method comprising:
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removing an encapsulating structure to form a void that exposes a first portion of the channel region, the channel region having a first lattice constant; selectively removing the first portion of the channel region while preserving a second portion of the channel region, the second portion having a first channel end connected to a first source/drain region and a second channel end exposed to the void; and forming a stressor region having a first stressor end formed against the second channel and a second stressor end formed against a second source/drain region, the stressor region having a second lattice constant different from the first lattice constant so as to induce a strain on the preserved second portion of the channel region. - View Dependent Claims (11, 12, 13, 14, 15)
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Specification