If a lot of electrons are accumulated in a conducting glass electrode (pasivated with fluorine dopped tin oxide), would the optical absorbance of the material increase at long wavelenghts (800-1200 nm?)
Yes, you start getting free carrier absorption in the infrared. For TCOs in solar cells there is always a trade-off between low sheet resistance and high transparency.
Thanks for your answer. Do you know if that absorption is comparable to the absorption of electrons in the conduction band of TiO2 for example? I would say no..
Ok I probably misunderstood your question then. What I meant is that when you have many free carriers, such as in the TCO (FTO in your case), those free carriers can absorb light, and this free carrier absorption increases a high wavelengths. For FTO, that would be electrons in the conduction band.
I'm not entirely sure what you mean by a conducting glass electrode. However any free carriers can exhibit free carrier absorption, and if you look up the equation for free carrier absorption and put in your material parameters you can calculate if it will have a noticeable effect.
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