SEMICONDUCTOR DEVICE WITH ENHANCED MOBILITY AND METHOD
First Claim
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1. A semiconductor device comprising:
- a region of semiconductor material having a major surface;
a trench control structure in the region of semiconductor material including a gate dielectric layer adjacent sidewall surfaces of the trench control structure and a gate electrode comprising a first conductive material adjoining the gate dielectric layer;
a body region within the region of semiconductor material and adjacent the trench control structure, where the trench control structure is configured to provide a channel region within the body region, where the channel region includes a source end and a drain end;
a source region within the body region having a first side adjacent the trench control structure and a second side opposite to the first side; and
a first feature comprising a material other than the first conductive material completely embedded within the gate electrode, where the first feature is configured to induce stress within portions of the channel region.
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Abstract
In one embodiment, a vertical insulated-gate field effect transistor includes a feature embedded within a control electrode. The feature is placed within the control electrode to induce stress within predetermined regions of the transistor.
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Citations
47 Claims
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1. A semiconductor device comprising:
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a region of semiconductor material having a major surface; a trench control structure in the region of semiconductor material including a gate dielectric layer adjacent sidewall surfaces of the trench control structure and a gate electrode comprising a first conductive material adjoining the gate dielectric layer; a body region within the region of semiconductor material and adjacent the trench control structure, where the trench control structure is configured to provide a channel region within the body region, where the channel region includes a source end and a drain end; a source region within the body region having a first side adjacent the trench control structure and a second side opposite to the first side; and a first feature comprising a material other than the first conductive material completely embedded within the gate electrode, where the first feature is configured to induce stress within portions of the channel region. - View Dependent Claims (2, 4, 5, 6, 8, 9)
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3. (canceled)
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7. (canceled)
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10. (canceled)
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11. (canceled)
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12. An insulating gate field effect transistor structure having enhanced mobility comprising:
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a region of semiconductor material having a first conductivity type, a first major surface, and a second major surface opposing the first major surface, where the region of semiconductor material at the second major surface is configured as a drain region; a trench structure within the region of semiconductor material comprising a shield electrode in a lower portion of a trench, where the shield electrode is separated from the region of semiconductor material by a first dielectric layer;
a gate electrode in an upper portion of the trench, wherein the gate electrode is separated from the region of semiconductor material by a second dielectric layer and separated from the shield electrode by a third dielectric layer;a body region having a second conductivity type opposite to the first conductivity type in the region of semiconductor material and adjacent to the trench structure, where the gate electrode is configured to form a channel region within the body region; a source region of the first conductivity type in spaced relationship with the body region having a first side adjacent to the trench structure and a second side opposite to the first side; and a first region within the gate electrode and comprising a silicide material that propagates stress within the region of semiconductor material adjacent to the trench control structure to provide the enhanced mobility. - View Dependent Claims (15, 16, 17, 18)
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13-14. -14. (canceled)
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19-39. -39. (canceled)
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40. A method of forming a semiconductor device comprising:
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providing a region of semiconductor material having a trench extending from a major surface and having an isolated shield electrode structure in a lower portion of the trench and a gate dielectric layer adjacent sidewalls of the trench; forming a first conductive layer adjacent the gate dielectric layer in the trench, the first conductive layer configured as part of a gate electrode structure; forming a stress inducing structure within the trench adjacent the first conductive layer, wherein the stress inducing structure and the first conductive layer comprises different materials; and forming a second conductive layer adjacent the stress inducing layer, the second conductive layer configured as another part of the gate electrode structure. - View Dependent Claims (41, 42, 43, 44, 45, 46, 47)
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Specification