Patent ID: 6110278
Filing Date: 2000-08-29
Classification: C30B,H01L,Y10S

Abstract:
A method for preparing a substrate for encouraging growth therefrom of a single crystal of a first material and growth therefrom of a single crystal of a second material, where the substrate includes a region of third material, said third material being comparatively unfriendly to attachment thereto by particles of said first and said second materials, the method comprising the steps of:creating in said third material region, a first set of spaced-apart nucleation-friendly sites whose apart spacings correspond to whole number multiples of respective lattice constants of a single crystal of said first material, and thereby substantially define a first growth template for preferentially seeding growth of said single crystal of said first material, where each nucleation-friendly site in said first set is defined by one or more particles of a fourth material to which said particles of the first material attach more preferentially than to particles of said third, nucleation-unfriendly material; andcreating in said third material region, a second set of spaced-apart nucleation-friendly sites whose apart spacings correspond to whole number multiples of respective lattice constants of a single crystal of said first material, and thereby substantially define a second growth template for preferentially seeding growth of the single crystal of said second material, where each nucleation-friendly site in said second set is defined by one or more particles of a fifth material to which said particles of the second material attach more preferentially than to particles of said third, nucleation-unfriendly materialwherein said single crystal of the first material differs from said single crystal of the second material at least in one of crystal orientation and chemical composition.