- #1
jaydnul
- 558
- 15
I know that the electrons in the N-type are in the conduction energy level, while the holes in the P-type are in the valence energy level, so when they recombine light is emitted.
What I don't understand is where that energy comes from. The electrons in a copper wire can freely flow from the valence to conduction level (and vice versa) anytime, right? So how is it that the electrons can just enter into the N-type at the conduction band and exit the P-type at the valence band? The .7V drop is to do with the depletion region, right? It has nothing to do with the light that's emitted?
Thanks
What I don't understand is where that energy comes from. The electrons in a copper wire can freely flow from the valence to conduction level (and vice versa) anytime, right? So how is it that the electrons can just enter into the N-type at the conduction band and exit the P-type at the valence band? The .7V drop is to do with the depletion region, right? It has nothing to do with the light that's emitted?
Thanks