I have absorbance (Abs), reflectance (R%) and transmittance (T%) data of TiO2 deposited tin film on FTO glass substrate. The data was collected using UV-Vis spectrophotometer.

How to calculate refractive index n from this?

from the refractive index I will estimate the film thickness, then I will estimate the band gap of the thin film.

I tried with n = (1 + R^1/2) / (1 - R^1/2) where R is reflectance, and with Sweaneopeol method , but it shows large deviation from reported value.

I find another method which given by n=1/Ts + (1/Ts-1)^1/2 , where n is refractive index and Ts is % transmission coefficient. But how can I obtain the transmission coefficient?

Thank you

  • $\begingroup$ Seems like you dont have enough information. Do you at least know the thickness and optical properties of the substrate? The substrate will play a role in the reflectance. $\endgroup$
    – Matt
    Commented Nov 10, 2023 at 17:42
  • $\begingroup$ yes, I don't have enough information for now, unfortunately.. at least I know the thickness of substrates. until now I saw anothor method to determine the refractive index using the transmittance coefficient but how then I can determine it..? please check my editted post. if you know, please suggest how to proceed. $\endgroup$
    – Mona
    Commented Nov 10, 2023 at 18:06


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