But it is not happening for other nonmetals such as nitrogen, carbon , Fluorine ( it can enter as anion into TiO2 site).
I am not sure that I fully understand the question you are asking but it is very important to consider charge balance when doping wide band gap oxides. Perhaps, in this case, it is because S(2-) is incorporated substitutionally for O (2-). Same charge state and ions of similar (ish) sizes. If you were to replace O(2-) with F(-) for example you would be n-doping the TiO2 and that is expensive as TiO2 is a wide band gap semiconductor.
S, N, and C are complex cases where both cation and anion doping (different chemical species as well as charge compensating defects) are possible and typically observed in the same material. F is a more simple case. You can see several new reviews for a summary.
Dear Marcos Fernández-García,
C and N can enter into TiO2 either substitutionally or intersitially. But F can enter into TiO2 as substitutionally. F cannot enter into an interstitial position of TiO2. I don't know the scientific reason behind this. Could you help me to understand this?
Dear Sridhar Sampath,
I can not give a complete answer but for a summary of my thinking you may check the following link:
https://www.researchgate.net/publication/51820731_Advanced_nanoarchitectures_for_solar_photocatalytic_applications
Article Advanced Nanoarchitectures for Solar Photocatalytic Applications
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