Patent ID: 9391235
Filing Date: 2016-07-12
CPC Classification: C30B,H01L,Y10T

Claim Text:
1. A patterned substrate for epitaxially growing a semiconductor material directly thereon, comprising: a top surface having a surface area; and a plurality of spaced apart recesses, each of which is indented downwardly from said top surface and is defined by three or more crystal planes, each of said crystal planes having an upper edge meeting said top surface and being adapted for epitaxially growing the semiconductor material; wherein a maximum distance from one of said upper edges of said planes of one of said recesses to an adjacent one of said upper edges of said planes of an adjacent one of said recesses is not greater than 500 nm, thereby minimizing the surface area of the top surface available for nucleation of the semiconductor material during the epitaxial growth; wherein said top surface is a crystal face (0001), each of said crystal planes being one of the group of crystal planes {11 thereby grain growth and coalescence of the semiconductor material after nucleation during the epitaxial growth of the semiconductor material are carried on from said crystal planes.