Patent ID: 8247317
Filing Date: 2012-08-21
Classification: C30B,H01L

Abstract:
1. A method of epitaxial growth of crystalline layers over a substrate, comprising: depositing a first insulation layer over the substrate; forming a first seed region having a first material in crystalline state in the first insulation layer; depositing a first layer of first material in amorphous state on the first seed region and at least a portion of the first insulation layer; depositing a second insulation layer over the first layer of first material; forming a second seed region having a first material in crystalline state in the second insulation layer; depositing a second layer of first material in amorphous state on the second seed region and at least a portion of the second insulation layer; directing a plurality of pulses of first electromagnetic energy toward a surface of the first seed region upon which the first layer of first material is deposited for a period of time that is sufficient to recrystallize and convert the first layer of first material, using the first seed region as a seed, from amorphous state into crystalline state and having the same grain structure and crystal orientation as the underlying first seed region; and directing a second electromagnetic energy having a wavelength and number of pulses that are different from the first electromagnetic energy toward a surface of the second seed region upon which the second layer of first material is deposited for a period of time that is sufficient to recrystallize and convert the second layer of first material, using the second seed region as a seed, from amorphous state into crystalline state and having the same grain structure and crystal orientation as the underlying second seed region.