Anyone can give me some suggestion about physical adsorption affecting band gap?
In general, adsorption is one of doping methods. Adsorption of metals and metal oxides ,for instance, may forms surfasce defects in the semiconductor .Defects can create new states in the bandgap which may change the optical band gap of semiconductor.Defects can cause of spectral shift . Type of shift depends on the doping levels .
In general, adsorption is one of doping methods. Adsorption of metals and metal oxides ,for instance, may forms surfasce defects in the semiconductor .Defects can create new states in the bandgap which may change the optical band gap of semiconductor.Defects can cause of spectral shift . Type of shift depends on the doping levels .
The required distinction here is between the different types of adsorption. Chemisorption will incorporate species onto the surface of the material, thereby altering its makeup and physical properties; the key step before a molecule can be chemisorbed is that it must be physically adsorbed onto the surface, so in this instance, yes physisorption was involved in altering the material and its band gap. However, the process of physisorption only, with no subsequent chemisorption, would only result in weak intermolecular interactions between the surface and the gas/vapour being adsorbed. These interactions are low in energy, typically
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