What is E_f - Ei

f is fermi

i is intrinsic

Question

What is E_f - Ei

f is fermi

i is intrinsic

anonymous · Answer

@Jemurray3

anonymous · Answer

No, that's the energy of the i'th state.  You can label them 1, 2, 3...

anonymous · Answer

this is from energy band diagram

anonymous · Answer

That's fine.  If you are in state i, then the difference between the energy of your state and the fermi energy of the system is Ef- Ei.

anonymous · Answer

ok , Ei is abitary

anonymous · Answer

No... what diagram are you looking at?

anonymous · Answer

http://courses.engr.illinois.edu/ece340/Homeworks/ECE340_HW11_SPRING2013_solution.pdf If you go to problem 3, they got E_f- Ei based on doping

anonymous · Answer

Notice that they didn't actually get Ef  - Ei, they got the difference between (Ef - Ei) in the collector and (Ef - Ei) in the emitter.  So yes, in this case it's just saying the energy gap between any state "i" and the fermi energy will be different in the emitter and collector.

anonymous · Answer

but where do the energy gaps value comes from ?