Before revision: However, if an electron in the valence band acquires enough energy to reach the conduction band as a result of interaction with other electrons, holes, photons, or the vibrating crystal lattice itself ) , it can flow freely among the nearly empty conduction band energy states.
After revision: However, if an electron in the valence band acquires enough energy to reach the conduction band as a result of interaction with other electrons, holes, photons, or the vibrating crystal lattice itself , it can flow freely among the nearly empty conduction band energy states.