Patent ID: 9287123
Filing Date: 2016-03-15
CPC Classification: H01J,H01L

Claim Text:
1. A method for etching a substrate, comprising: providing a reactive ambient around the substrate when a non-crystalline layer is disposed over a first crystalline material in the substrate; generating a plasma in a plasma chamber; modifying a shape of a plasma sheath boundary of the plasma; extracting ions from the plasma; directing the ions to the substrate at a non-zero angle of incidence with respect to a perpendicular to a plane of the substrate, wherein the ions and reactive ambient are effective to form an angled trench through the non-crystalline layer to expose a portion of the first crystalline material at a bottom of the angled trench, the angled trench forming a non-zero angle of inclination with respect to the perpendicular; and forming a second crystalline material within the angled trench by epitaxial growth, wherein the first crystalline material and second crystalline material have mismatched lattice dimensions.