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+clc
+//Chapter6
+//Ex_6
+//Given
+e=1.6*10^-19 // in coulombs
+Nd=10^16 //in cm^-3
+Ebr=4*10^5//in V/cm
+epsilono=8.85*10^-12*10^-2 //in F/cm
+epsilonr=11.9
+epsilon=epsilono*epsilonr
+Vbr=epsilon*Ebr^2/(2*e*Nd)
+disp(Vbr,"Reverse break down voltage of the Si diode in Volts is")
+//part(b)
+Nd=10^17 //in cm^-3
+Ebr=6*10^5//in V/cm
+Vbr=epsilon*Ebr^2/(2*e*Nd)
+disp(Vbr,"Reverse break down voltage in Volts when phosphorous doping is incresed to 10^17 cm^-3 is")