Low defect relaxed SiGe/strained Si structures on implant anneal buffer/strain relaxed buffer layers with epitaxial rare earth oxide interlayers and methods to fabricate same
First Claim
1. A structure, comprising:
- a substrate having a top surface;
a first semiconductor layer disposed on the top surface of the substrate, the first semiconductor layer having a first unit cell geometry and comprising implanted ions;
a layer comprised of a metal-containing oxide disposed on the first semiconductor layer;
a second semiconductor layer disposed on the layer comprised of the metal-containing oxide, the second semiconductor layer having the first unit cell geometry;
a third semiconductor layer disposed on a top surface of the second semiconductor layer;
where the layer of metal-containing oxide has a second unit cell geometry that differs from the first unit cell geometry to inhibit propagation of misfit dislocations from the first semiconductor layer into the second semiconductor layer and from the second semiconductor layer into the third semiconductor layer, where the misfit dislocations originate from nucleation centers formed by the implanted ions in the first semiconductor layer;
where the second semiconductor layer is comprised of Si1-xGex, and where the third semiconductor layer is comprised of a layer of strained silicon disposed on the top surface of the second semiconductor layer.
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Abstract
A method provides a substrate having a top surface; forming a first semiconductor layer on the top surface, the first semiconductor layer having a first unit cell geometry; epitaxially depositing a layer of a metal-containing oxide on the first semiconductor layer, the layer of metal-containing oxide having a second unit cell geometry that differs from the first unit cell geometry; ion implanting the first semiconductor layer through the layer of metal-containing oxide; annealing the ion implanted first semiconductor layer; and forming a second semiconductor layer on the layer of metal-containing oxide, the second semiconductor layer having the first unit cell geometry. The layer of metal-containing oxide functions to inhibit propagation of misfit dislocations from the first semiconductor layer into the second semiconductor layer. A structure formed by the method is also disclosed.
20 Citations
20 Claims
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1. A structure, comprising:
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a substrate having a top surface; a first semiconductor layer disposed on the top surface of the substrate, the first semiconductor layer having a first unit cell geometry and comprising implanted ions; a layer comprised of a metal-containing oxide disposed on the first semiconductor layer; a second semiconductor layer disposed on the layer comprised of the metal-containing oxide, the second semiconductor layer having the first unit cell geometry; a third semiconductor layer disposed on a top surface of the second semiconductor layer; where the layer of metal-containing oxide has a second unit cell geometry that differs from the first unit cell geometry to inhibit propagation of misfit dislocations from the first semiconductor layer into the second semiconductor layer and from the second semiconductor layer into the third semiconductor layer, where the misfit dislocations originate from nucleation centers formed by the implanted ions in the first semiconductor layer; where the second semiconductor layer is comprised of Si1-xGex, and where the third semiconductor layer is comprised of a layer of strained silicon disposed on the top surface of the second semiconductor layer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A structure, comprising:
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a Silicon substrate having a top surface; a first Si1-xGex semiconductor layer disposed on the top surface of the Si substrate, the first Si1-xGex semiconductor layer being a strained Si1-xGex semiconductor layer that has a diamond lattice crystal structure, the first Si1-xGex semiconductor layer comprising an implanted material; a compound epitaxial oxide layer comprised of (LayY1-y)2O3, where y is about 0.3, disposed on a top surface of the first Si1-xGex semiconductor layer, the compound epitaxial oxide layer having a cubic lattice crystal structure; a second Si1-xGex semiconductor layer disposed on a top surface of the compound epitaxial oxide layer, the second Si1-xGex semiconductor layer having the diamond lattice crystal structure; a third semiconductor layer disposed on a top surface of the second Si1-xGex semiconductor layer; where the compound epitaxial oxide layer inhibits propagation of misfit dislocations from the first Si1-xGex semiconductor layer into the second Si1-xGex semiconductor layer and from the second Si1-xGex semiconductor layer into the third semiconductor layer, where the misfit dislocations originate from nucleation centers formed by the implanted material in the first semiconductor layer. - View Dependent Claims (10, 11, 12, 13, 14, 15)
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16. A structure, comprising:
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a substrate having a top surface; a first semiconductor layer disposed on the top surface of the substrate, the first semiconductor layer having a first unit cell geometry and comprising implanted ions; a layer comprised of a metal-containing oxide disposed on the first semiconductor layer; a second semiconductor layer disposed on the layer comprised of the metal-containing oxide, the second semiconductor layer having the first unit cell geometry; a third semiconductor layer disposed on a top surface of the second semiconductor layer; where the layer of metal-containing oxide has a second unit cell geometry that differs from the first unit cell geometry to inhibit propagation of misfit dislocations from the first semiconductor layer into the second semiconductor layer and from the second semiconductor layer into the third semiconductor layer, where the misfit dislocations originate from nucleation centers formed by the implanted ions in the first semiconductor layer; where the first semiconductor layer is comprised of Si1-xGex, and where the third semiconductor layer is comprised of a layer of Si1-xGex disposed on the top surface of the second semiconductor layer, where the value of x in the third semiconductor layer that is comprised of Si1-xGex is greater than the value of x in the first semiconductor layer. - View Dependent Claims (17, 18, 19, 20)
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Specification