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{
"metadata": {
"celltoolbar": "Raw Cell Format",
"name": "",
"signature": "sha256:4fe36e3e0da1a77ee9793bbcdad9ed8d44455b05327e70b42ad389ca8fb3e239"
},
"nbformat": 3,
"nbformat_minor": 0,
"worksheets": [
{
"cells": [
{
"cell_type": "heading",
"level": 1,
"metadata": {},
"source": [
"Chapter 2: Semiconductor Physics"
]
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 2.21.1,Page number 2-47"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"import math\n",
"\n",
"#Given Data:\n",
"\n",
"ro=1.72*10**-8 #resistivity of Cu\n",
"s=1/ro #conductivity of Cu\n",
"n=10.41*10**28 #no of electron per unit volume\n",
"e=1.6*10**-19 #charge on electron\n",
"\n",
"u=s/(n*e)\n",
"print\"mobility of electron in Cu =\",round(u,4),\"m**2/volt-sec\""
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"mobility of electron in Cu = 0.0035 m**2/volt-sec\n"
]
}
],
"prompt_number": 2
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 2.21.2,Page number 2-47"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"import math\n",
"\n",
"#Given Data:\n",
"\n",
"m=63.5 #atomic weight\n",
"u=43.3 #mobility of electron\n",
"e=1.6*10**-19 #charge on electron\n",
"N=6.02*10**23 #Avogadro's number\n",
"d=8.96 #density\n",
"\n",
"Ad=N*d/m #Atomic density\n",
"n=1*Ad\n",
"\n",
"ro=1/(n*e*u)\n",
"\n",
"print\"Resistivity of Cu =\",\"{0:.3e}\".format(ro),\"ohm-cm\""
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Resistivity of Cu = 1.699e-06 ohm-cm\n"
]
}
],
"prompt_number": 4
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 2.21.3,Page number 2-47"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"import math\n",
"\n",
"#Given Data:\n",
"\n",
"e=1.6*10**-19 #charge on electron\n",
"ne=2.5*10**19 #density of carriers\n",
"nh=ne #for intrinsic semiconductor\n",
"ue=0.39 #mobility of electron\n",
"uh=0.19 #mobility of hole\n",
"\n",
"s=ne*e*ue+nh*e*uh #conductivity of Ge\n",
"ro=1/s #resistivity of Ge\n",
"\n",
"print\"Resistivity of Ge =\",round(ro,4),\"ohm-m\""
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Resistivity of Ge = 0.431 ohm-m\n"
]
}
],
"prompt_number": 6
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 2.21.6,Page number 2-49"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"import math\n",
"\n",
"#Given Data:\n",
"\n",
"c=5*10**28 #concentration of Si atoms\n",
"e=1.6*10**-19 #charge on electron\n",
"u=0.048 #mobility of hole\n",
"s=4.4*10**-4 #conductivity of Si\n",
"\n",
"#since millionth Si atom is replaced by an indium atom\n",
"\n",
"n=c*10**-6\n",
"sp=u*e*n #conductivity of resultant\n",
"\n",
"print\"conductivity =\",sp,\"mho/m\""
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"conductivity = 384.0 mho/m\n"
]
}
],
"prompt_number": 10
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 2.21.7,Page number 2-49"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"import math\n",
"\n",
"#Given Data:\n",
"\n",
"m=28.1 #atomic weight of Si\n",
"e=1.6*10**-19 #charge on electron\n",
"N=6.02*10**26 #Avogadro's number\n",
"d=2.4*10**3 #density of Si\n",
"p=0.25 #resistivity\n",
"\n",
"#no. of Si atom/m**3\n",
"Ad=N*d/m #Atomic density\n",
"\n",
"#impurity level is 0.01 ppm i.e. 1 atom in every 10**8 atoms of Si\n",
"n=Ad/10**8 #no of impurity atoms\n",
"\n",
"#since each impurity produce 1 hole\n",
"nh=n\n",
"print\"1) hole concentration =\",\"{0:.3e}\".format(n),\"holes/m**3\"\n",
"up=1/(e*p*nh)\n",
"print\"2) mobility =\",round(up,4),\"m**2/volt.sec\"\n"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"1) hole concentration = 5.142e+20 holes/m**3\n",
"2) mobility = 0.0486 m**2/volt.sec\n"
]
}
],
"prompt_number": 12
},
{
"cell_type": "code",
"collapsed": false,
"input": [],
"language": "python",
"metadata": {},
"outputs": []
}
],
"metadata": {}
}
]
}
|
