Hi Chao. Yes the band gap is in the nature of the material, depending in its crystal strcture that determines the band structure hence the band gap. Pressure can modify it as much as it modifies the crystal structure. Temperature in some extent. If you are not Physic get some solid state book and try to read the sections regardi crystal srructure, elecrtronic structure
I would like to help you but your question brings a lot of interpretation. Are you comparing results for different materials or analizing an complex experimental data?
Or are you possibly having optical measurements and try to fit the tauc plot?
Your question is not clear!. Determining a band gap ? or choosing a material with a band gap for a specific application?
I am confused, do you mean how the band gap value is assigned to a material? For exampke how somebody decided that eg of silica is 9 eV?
Hi Chao. Yes the band gap is in the nature of the material, depending in its crystal strcture that determines the band structure hence the band gap. Pressure can modify it as much as it modifies the crystal structure. Temperature in some extent. If you are not Physic get some solid state book and try to read the sections regardi crystal srructure, elecrtronic structure
Scanning tunneling microscope (STM) could be used to determine the band gap of the solid material.
Also alternatively pump and probe laser could be used
is making a solution of the solid material and take an UV-vis diffuse
reflectance spectra (DRS) analysis a promising way to find out the bandgap?
you can set to zero at the UV-Vis for pure solvent and take the difference between the solution and pure solvent. is that true?
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