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| author | priyanka | 2015-06-24 15:03:17 +0530 |
|---|---|---|
| committer | priyanka | 2015-06-24 15:03:17 +0530 |
| commit | b1f5c3f8d6671b4331cef1dcebdf63b7a43a3a2b (patch) | |
| tree | ab291cffc65280e58ac82470ba63fbcca7805165 /3020/CH18/EX18.12/ex18_12.sce | |
| download | Scilab-TBC-Uploads-b1f5c3f8d6671b4331cef1dcebdf63b7a43a3a2b.tar.gz Scilab-TBC-Uploads-b1f5c3f8d6671b4331cef1dcebdf63b7a43a3a2b.tar.bz2 Scilab-TBC-Uploads-b1f5c3f8d6671b4331cef1dcebdf63b7a43a3a2b.zip | |
initial commit / add all books
Diffstat (limited to '3020/CH18/EX18.12/ex18_12.sce')
| -rwxr-xr-x | 3020/CH18/EX18.12/ex18_12.sce | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/3020/CH18/EX18.12/ex18_12.sce b/3020/CH18/EX18.12/ex18_12.sce new file mode 100755 index 000000000..b84f5209c --- /dev/null +++ b/3020/CH18/EX18.12/ex18_12.sce @@ -0,0 +1,15 @@ +clc;
+clear all;
+Eg=1;//bandgap in eV
+//let me/mh=x
+x=4;//given me/mh value
+k=1.38e-23;//boltzman constant
+//formula is Ef=(Eg/2)+(3*k*T/4)*log(mh/me) fermi level
+//and Ef=Ev+0.5eV so..
+//(Ev+0.5)*1.6e-19=(Ec+Ev)/2
+//at temperature T , (Ev+0.5)*1.6e-19=((3*k*T)/4)*logx
+//so.. 1.6e-19=(3*k*T)/log(x)
+//so.. T=4*1.6e-19/(3*k*log(x))
+T=(4*0.16e-19)/(3*k*log10(x));//temperature at which fermi level is shifted to 10%
+disp('K',T,'temperature at which fermi level is shifted to 10% is:')
+// Wrong answer printed in textbook... checked in calculator also
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