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How to Select Substrate Materials of LED Epitaxial Wafer
(1) Structural matching between substrate materials and epitaxial film
Substrate materials are structurally similar to epitaxial film with lower lattice mismatch, high-crystallization rate and low defect density.
(2) Thermal expansivity matching between substrate materials and epitaxial film
Coefficient of thermal expansion matching is significant. Big difference in thermal expansivity between substrate materials and epitaxial film will deteriorate the quality of epitaxial wafer and lead to unpredictable component damage.
(3) Chemical stability matching between substrate materials and epitaxial film
Substrate materials of good chemical resistance can ensure lower decomposition and corrosion and delay quality decay.
(4) Ease or complexity of materials preparation and cost
Considering LED industry development, materials preparation should be easy and lower at cost. Substrate dimension is less than 2 inches.