How to measure Band Gap Energy by solid state UV. Can we plot K-M factor and energy using UV absorbance from 200 to 800 nm data?

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Jean-Claude G Bünzli

If your spectrum is plotted KM versus energy, then the onset of the least energetic band will give you the bandgap value

See:

https://ac.els-cdn.com/S0927024807001948/1-s2.0-S0927024807001948-main.pdf?_tid=63cfd09c-e70c-11e7-a7d2-00000aab0f26&acdnat=1513942794_4b8ded72fd8b2e69d4747489b0792cd5

I attach the file (see Fig. 4)

Mohamed Hassaan

You can follow the paper uploaded by Roberto