GaN on Sapphire wafer are good chemical stability, no absorption of visible light, moderate price, and relatively mature manufacturing technology. But the thermal conductivity is relatively poor, suitable for use in the operation of low current devices.
Neodymium gallate (NdGaO3) crystal is a new single-crystal substrate material developed in recent years, NdGaO3 are mainly used for high-temperature superconductors (YBCO) and magnetic's Epitaxial films growth, Because NdGaO3 and YBCO with the small lattice mismatch (~ 0.27%), and no structural phase change.
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