Passivation structure of fin field effect transistor
First Claim
1. A method of fabricating a fin field effect transistor, the method comprising:
- forming a first fin on a semiconductor substrate, the first fin comprising a first semiconductor material, a second semiconductor material over the first semiconductor material, and a third semiconductor material over the second semiconductor material, the first semiconductor material having a first lattice constant, the second semiconductor material having a second lattice constant, the third semiconductor material having a third lattice constant, the first lattice constant being different than the second lattice constant, the second lattice constant being different than the third lattice constant;
performing an oxidation process along sidewalls of the first fin; and
performing a nitridation process along sidewalls of the first fin, the nitridation process forming a nitride layer along sidewalls of the first fin, the nitride layer having a first portion comprising elements of the first semiconductor material, a second portion comprising elements of the second semiconductor material, and a third portion comprising elements of the third semiconductor material.
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Abstract
A FinFET comprises a substrate comprising a major surface; a fin structure protruding from the major surface comprising a lower fin portion comprising a first semiconductor material having a first lattice constant; an upper fin portion comprising a second semiconductor material having a second lattice constant greater than the first lattice constant; a middle fin portion comprising a third semiconductor material having a third lattice constant between the first lattice constant and the second lattice constant; and a passivation structure surrounding the fin structure comprising a lower passivation portion surrounding the lower fin portion comprising a first oxynitride of the first semiconductor material; an upper passivation portion surrounding the upper fin portion comprising a second oxynitride of the second semiconductor material; and a middle passivation portion surrounding the middle fin portion comprising a third oxynitride of the third semiconductor material.
50 Citations
20 Claims
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1. A method of fabricating a fin field effect transistor, the method comprising:
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forming a first fin on a semiconductor substrate, the first fin comprising a first semiconductor material, a second semiconductor material over the first semiconductor material, and a third semiconductor material over the second semiconductor material, the first semiconductor material having a first lattice constant, the second semiconductor material having a second lattice constant, the third semiconductor material having a third lattice constant, the first lattice constant being different than the second lattice constant, the second lattice constant being different than the third lattice constant; performing an oxidation process along sidewalls of the first fin; and performing a nitridation process along sidewalls of the first fin, the nitridation process forming a nitride layer along sidewalls of the first fin, the nitride layer having a first portion comprising elements of the first semiconductor material, a second portion comprising elements of the second semiconductor material, and a third portion comprising elements of the third semiconductor material. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method of fabricating a fin field effect transistor, the method comprising:
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forming a first semiconductor layer over a semiconductor substrate, the first semiconductor layer having a different lattice constant than the semiconductor substrate; forming a second semiconductor layer over the first semiconductor layer, the second semiconductor layer having a different lattice constant than the first semiconductor layer; forming a plurality of trenches that extends through the first semiconductor layer, the second semiconductor layer, and into the semiconductor substrate to form a fin structure between adjacent trenches; forming a passivation layer along sidewalls and a bottom of the trenches, the passivation layer comprising a nitride layer; and forming an isolation layer over the nitride layer along opposing sides of the fin structure. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14)
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15. A fin field effect transistor (FinFET) comprising:
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a fin extending from a substrate, the fin having a first semiconductor material, a second semiconductor material over the first semiconductor material, and a third semiconductor material over the second semiconductor material, the first semiconductor material having a first lattice constant, the second semiconductor material having a second lattice constant, the third semiconductor material having a third lattice constant, the first lattice constant being different than the second lattice constant, the second lattice constant being different than the third lattice constant; and a passivation layer over the fin, the passivation layer comprising a first nitride along sidewalls of the first semiconductor material, a second nitride along sidewalls of the second semiconductor material, and a third nitride along sidewalls of the third semiconductor material. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification