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 ____________________________________________________________________________ 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.