Patent ID: 8928006
Filing Date: 2015-01-06
Classification: C30B,H01L

Abstract:
1. A substrate structure, comprising: a substrate; and at least a groove structure formed on a surface of the substrate, the groove structure having a lateral epitaxial pattern in a cross section perpendicular to the surface of the substrate, wherein the lateral epitaxial pattern comprises: a first edge inclined with respect to the surface of the substrate; a second edge adjacent to the first edge and parallel to the surface of the substrate; a third edge parallel to the first edge, having a projection on the surface of the substrate at least entirely covering the second edge; and a fourth edge adjacent to the third edge, in which the second edge is the bottom of the groove structure; and a first intersection point between the second edge and the third edge on the second edge and an injection of a second intersection point between the third edge and the fourth edge on the second edge are located on two sides of a third intersection point between the first edge and the second edge, or the injection of the second intersection point between the third edge and the fourth edge on the second edge coincides with the third intersection point between the first edge and the second edge.