• Support PF! Buy your school textbooks, materials and every day products Here!

Quasi Fermi Levels

  • Thread starter EE_or_Bust
  • Start date
Can someone please help with this problem. I've been looking at it for a week!
I can't figure out what equation to use.

A si sample with 10^15/cm^3 donors is uniformly optically excited at room temperature such that 10^19 EHPs (Electron Hole Pairs) are generated per second. Find the separation of the quasi Fermi level and the change of conductivity upon shinig the light. Electron and hole lifetimes are both 10μs. =12. {Hint: to find Fn-Fp , use the relation relating (np) and nd (ni, Fn, Fp). μn=1300[cm^2/ V-s].

I know that Fn and Fp are the quasi fermi electron and hole levels. And I know the common quasi formulas are
n=(ni)(e^-(ei-Fn)/KT)
p=(ni)(e^-(-Fp-Ei)/KT)

How do I use these equations to find the separation of the quasi fermi level?
 
Last edited:

Answers and Replies

Related Threads for: Quasi Fermi Levels

  • Last Post
Replies
1
Views
9K
  • Last Post
Replies
2
Views
13K
Replies
1
Views
927
  • Last Post
Replies
6
Views
664
  • Last Post
Replies
1
Views
1K
  • Last Post
Replies
12
Views
3K
  • Last Post
Replies
7
Views
1K
  • Last Post
Replies
1
Views
4K
Top