Answer to Question #240269 in Electrical Engineering for scada HMI

Question

• Consider a pn junction in equilibrium at room temperature (T = 300 K) for which the doping concentrations are NA = 1018/cm3 and ND = 1016/cm3 and the cross-sectional area A = 10-4 cm2. Calculate pp, np, nn, pn, V0, W, xn, xp and QJ.​

Answer 1

We can use n_i = 1.5×1010/cm3 for the calculations:

We obtain the value of V₀ by deducing from the equation:

Therefore: V₀ =0.814 V

And for X_n and X_p  we use the equation: 

Lastly, charge stored on either sides: