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diff --git a/3636/CH7/EX7.9/Ex7_9.sce b/3636/CH7/EX7.9/Ex7_9.sce
new file mode 100644
index 000000000..edd66c27d
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+clc;
+clear;
+phi_m=4.3 //work function in eV
+xsi=4 //electron affinity in eV
+p0=10^17 //in cm^-3
+Na=10^17 //in cm^-3
+ni=1.5*10^10 //in cm^-3
+delE_fc=0.957 //in eV
+Const=0.0259 //constant value for kT in eV
+
+//Calculation
+delE_if=Const*log(p0/ni)
+
+//a) Before contact
+phi_s=xsi+delE_fc 
+
+//b) After contact
+phi_B=phi_m-xsi 
+eV0=phi_s-phi_m
+
+mprintf("Energy state difference= %.3f eV\n",delE_if)
+mprintf(" a)phi_s= %.3f eV\n",phi_s)
+mprintf(" b)Forward Bias (phi_B)= %.1f eV\n",phi_B)
+mprintf("   eV0= %.3f eV",eV0) //The answer provided in the textbook is wrong
+