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+clear; close; clc;
+
+kc=1.380*(10^(-23));//constant
+te=300;//room_temp_in_kelvin
+qe=1.602*(10^(-19));//electron_charge
+ni=1.45*(10^10);
+p=3*(10^17);
+esi=11.7*8.85*(10^(-14));
+deg=2*kc*te*abs(log(ni/p))/qe;
+xd=sqrt((2*esi*deg)/(qe*p));
+qb=-sqrt(2*qe*p*esi*abs(-deg));
+disp(deg,'degree of band bending(in volt):');
+disp(xd,'limiting value of depletion layer width(in cm)');
+disp(qb,'total charge in depleted region(in C/cm^2)');