I want to determine the band-gap of Gallium oxide nano structures on a gallium phosphide substrate. are there any other methods apart from REELS?
I think you can use Optical absorption spectroscopy to calculate the band gap.
You can calculate the energy gap using the Tauc relation; plot the values of (αhυ)^2 vs hυ for the direct band gap & for the indirect band gap (αhυ)^1/2 vs hυ. And the chosen straight line vertically downward to X-axis that value is your band gap.
is there a way to get it done into IR range and which system should I use as my sample size is quite small.
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