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+// Example 2.3 
+// Calculation of potential difference
+// page no 480
+
+clc;
+clear;
+close;
+
+// Given data
+na=10^24;                     // Accepter impurity level
+nd=10^22;                     // Donor impurity level
+ni=2.4*10^19;                 // Intrinsic electron 
+T=290;                        // Room temperature
+e=1.602*10^-19;               // Electric charge
+K=1.38*10^-23;                // Boltzmann constant
+
+
+//Potential difference
+V=(K*T)/e*(log(na*nd/(ni)^2));
+
+//Display result on command window
+printf("\n Potential difference (V) = %0.2f  ",V);
+// The potential difference varies with the variation of Na, Nd and ni