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**internel potentiel of PN junction?? so complicated**

homojunction PN (not polarized), externel potentiel difference applied = 0 Volt .

i should demonstrate the equation: e*Vbi + Eg + ( Ec - Ef ) + ( Ef - Ev) = 0

Given: Vbi= internel potential

Eg= energy gap

Ef = Fermi energy level

Ec= Energy of conduction level

Ev= Energy of valence level

then i should deduce, that if the junction are so dopped that : Vbi = Eg/e

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Ive try a lot to solve the first equation, but i couldnt find the solution. what ive found it that Vbi must equal Zero, and thats impossible cause .

hope someone know how to solve that.