Contact pontential for a semiconductor

[Marcis231]

Homework Statement

SK doping stratified where the concentration of donor atoms = 10^2 acceptor atomic concentration, acceptor atomic concentration of 1 acceptor atom per 108 Ge atoms. Calculate the contact potential Vo at 300oK if it is known that the atomic concentration of Ge is 4.4 x 10^28 atoms⁄ m3 and the atomic concentration of intrinsic = ni = 2.5 x 10^13 and the potential VT = 0.0259 Volt. The acceptor atomic concentration is 10^-8 Ge atom concentration.

Relevant Equations

I don't know which formula that i should use for this question

Anyone can help me, which formula I should use for this question?

 

[Charles Link]

One thing that might help others reading this is that I think you have a typo: $108$ in the second line should be $10^8$, if I'm not mistaken.