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+//Optoelectronics - An Introduction, 2nd Edition by J. Wilson and J.F.B. Hawkes
+//Example 2.5
+//OS=Windows XP sp3
+//Scilab version 5.5.2
+clc;
+clear;
+
+//given
+k=1.38e-23;//Boltzmann's constant in SI Units
+T=290;//room temperature in K
+e=1.6e-19;//charge of electrons in C
+Nd=1e22;//donor impurity level in m(-3)
+Na=1e24;//acceptor impurity level in m(-3)
+ni=2.4e19;//intrinsic electron concentration in m^(-3)
+
+V0=k*T/e*log(Na*Nd/(ni^2));//contact potential difference in V
+mprintf("V0 = %.2f V",V0);