Hello, I'm trying to understand the kronig penney model which leads to E-k diagram and eventually to conductance energy Ec and valence energy Ev for semiconductor model.(adsbygoogle = window.adsbygoogle || []).push({});

Hmm... I'm having a hard time to describe this, but I'm reading Pierret book now and the solution for kronig penney model shows that the valence bands are the lowest energy bands which would contain the total number of non-core electrons, contributed by the atoms to the crystal.

These valence bands can be at energy larger than the quantum well potential in the kronig penney model. When electron has energy > well potential, doesn't it become a 'free' electron? doesn't that means the electron is a carrier? How to reconcile this with the fact that this energy is still valence energy, not conductance energy?

Isn't this well potential the same as the covalence bond potential energy? If electrons in valence band are those in covalence bonds, doesn't it mean their energy must be less than the well potential?

Thank you in advance for your help.

-andre

**Physics Forums | Science Articles, Homework Help, Discussion**

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: (kronig penney) E > Uo still valence energy?

**Physics Forums | Science Articles, Homework Help, Discussion**