I had given GaN deposited SiC wafer for manual dicing, but after getting it back I am confused about which side the GaN is now on.
Is there an easy way to determine this?
I can suggest to measure PL spectra under 325 nm excitation from both sides
If you have access to XRF it's easy to figure out which side has Ga and which one doesn't.
you can try with ellipsometry (checking the refractive index).
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