Greatly appreciate your information !
my materials is ZnO, modified by other elements, or doped. Intuitively, the exciton binding energy will change, nevertheless, I don't know whether it reduces or increases.
To measure the exciton binding energy, whether is it not enough to get absorption spectra ? for example, in an absorption spectra of UV-vis spectra under room temperature, there is no fine absorption values. Does the fine absorption values appear at low temperature, or other conditions ?