Method for growth of a merged crystal by bonding at least a first and second crystal to an adhesion layer to form a tiled substrate and growing a crystalline composition over said tiled substrate

A method for growth of a large-area merged crystal, the method comprising:

• depositing an adhesion layer on a surface of a handle substrate, said adhesion layer having a melting point at a first temperature;
• bonding at least a first crystal and a second crystal to said adhesion layer to form a tiled substrate while said adhesion layer is at a temperature of no less than said first temperature, to melt said adhesion layer to enhance its adhesion;
• heat treating said adhesion layer to form a heat-treated adhesion layer, said heat-treated adhesion layer having a melting point at a second temperature higher than said first temperature;
• and
• laterally and vertically growing a crystalline, composition over said tiled substrate at a third temperature to form a merged crystal, said third temperature being higher than said first temperature and below said second temperature.