Epitaxial material grown laterally within a trench and method for producing same
First Claim
1. A method for growing a low dislocation density material, comprising the steps of:
- forming a trench in a substrate; and
growing, in said trench, an epitaxial lateral growth layer, that originates from a wall of said trench, said epitaxial lateral growth layer including a plurality of growth regions, each growth region extending about 90 degrees with respect to each prior growth region, said plurality of growth regions being grown in one continuous growth step.
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Abstract
An epitaxial material grown laterally in a trench allows for the fabrication of a trench-based semiconductor material that is substantially low in dislocation density. Initiating the growth from a sidewall of a trench minimizes the density of dislocations present in the lattice growth template, which minimizes the dislocation density in the regrown material. Also, by allowing the regrowth to fill and overflow the trench, the low dislocation density material can cover the entire surface of the substrate upon which the low dislocation density material is grown. Furthermore, with successive iterations of the trench growth procedure, higher quality material can be obtained. Devices that require a stable, high quality epitaxial material can then be fabricated from the low dislocation density material.
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Citations
15 Claims
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1. A method for growing a low dislocation density material, comprising the steps of:
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forming a trench in a substrate; and
growing, in said trench, an epitaxial lateral growth layer, that originates from a wall of said trench, said epitaxial lateral growth layer including a plurality of growth regions, each growth region extending about 90 degrees with respect to each prior growth region, said plurality of growth regions being grown in one continuous growth step. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
forming an additional trench in said epitaxial lateral growth layer; and
growing an additional epitaxial lateral growth layer in said additional trench.
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14. The method as defined in claim 1, wherein said trench is etched into said substrate.
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15. The method as defined in claim 13, wherein said additional trench is formed at an angle to said trench.
Specification