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+clc;
+clear;
+Na=5*10^18 //doping densities in cm^-3
+Nd=5*10^15 //in cm^-3
+ni=1.5*10^10 //in cm^-3
+VR=4 //voltage in V
+epsilon_s=11.7 //in F/cm
+epsilon_0=8.85*10^-14 //in F/cm
+Vbi=0.838 //built-in potential in V
+e=1.6*10^-19 //in J
+
+//Calculation
+W=((2*epsilon_s*epsilon_0*(Vbi+VR)*(Na+Nd))/(e*Na*Nd))^0.5
+
+mprintf("Total space-charge width= %1.2e cm",W)