I have measured the Reflectance of some materials and would love to determine the band gap as well as make a plot of Reflectance % vs eV. I also want to convert this Reflectance % data to Absorbance so i can make a plot of Absorbance vs Wavelength.
Is the thickness of your material sufficient to absorb all refracted part of the incident spectrum? ONLY if the rest of your radiation is absorbed in the material, then you can apply the continuity principle of optical power, That is
The incident radiation power = The reflected power + the absorbed power+ the transmitted power coming out of the material..So,you must be sure that the transmitted power is negligibly small.
If this is the matter then
Then the absorbed power part = 1- reflectance
A good estimate of absorption is possible only transmitted amount is small,the specimen should be sufficiently thick and non transparent.
Thank you all for your replies to the question. The thickness of the material was sufficient to absorb the refracted part of the incident spectrum. I had used the Kubelka-Munk equation for the calculation and obtained the expected band gap values my question was to confirm if my calculations were correct. Thanks once again.
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