What Causes the Forbidden Gap in Semiconductors?

Arthur202
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Can anybody explain my what is the origin of this forbidden gap?

I mean how it was created and what is the physics behind this issue?
 
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Dr. Courtney said:
https://en.wikipedia.org/wiki/Band_gap

There isn't a real explanation there for the phenomenon as I have asked. i didn't ask what is it.
 
I am also looking for a good explanations for bloch functions and beriluen zone..why we have it and what is the meaning...

And the last issue I am interested in what are the determination rules in quantum dots ( I mean spectroscopic rules)?
 
Arthur202 said:
There isn't a real explanation there for the phenomenon as I have asked. i didn't ask what is it.

The band gap exists because there are no solutions to the Schrodinger equation for that range of energies.
 

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