the new material now that you can search por this question. the most dark material of the world
You have to check the thickness of films after spin coating. I think it may provide you solution for your question
The thicknesses of the films decreased with increase in coating speed, but this due to decreasing of optical absorption, so I think in your case, with increasing the spin coating speed the particles size increases or may be aggregated
The increasing of coating speed led to decrease the thickness of coated film, and then decrease the optical absorption. but in your case, I think due to aggregation of nanoparticles or due to morphology of film surface. chick the reflection and refractive index. absorption maybe decreased with increasing the thickness as result as flat and texture type of high reflective thin films and when the film become thin the surface texture is suitable to light trapping.
good regards
raed
In my research absorption increases which i need bcz this is my research to increase absorption but i have no proper answer why increases , and also the question is why band gap increases by increasing spin speed
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