As ZnO has 60 meV exciton binding energy which we call as large exciton binding energy. So what is the range from which we can say that it is either maximum or minimum?
Dear Sohail Ahmad,
Info below shed some light on the notion of "exciton binding energy":
Exciton Binding Energy
EB is the exciton binding energy in the solids that is the energy difference between a bound electron–hole pair on one molecular unit and a free electron and hole on different units.
From: Nanostructured Materials for Solar Energy Conversion, 2006
https://www.sciencedirect.com/topics/engineering/exciton-binding-energy
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Excitation energies
HF theory of excitation energies
QMC theory of excitation energies
https://web.ornl.gov/~kentpr/thesis/pkthnode53.html
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Electrical Tuning of Exciton Binding Energies in Monolayer WS2
https://web.stanford.edu/group/heinz/publications/Pub245.pdf
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