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{
"cells": [
{
"cell_type": "heading",
"level": 1,
"metadata": {},
"source": [
"Chapter16:Semiconductors"
]
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Ex16.1:pg-315"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"#Example 16.1 : concentration\n",
"\n",
"#given data :\n",
"e=1.602*10**-19;# Coulomb\n",
"sigma_i=5*10**-4;# in ohm/m\n",
"mu_n=0.14;# in m**2/V-sec\n",
"mu_p=0.05;# in m**2/V-sec\n",
"n_i=sigma_i/(e*(mu_n+mu_p));\n",
"print round(n_i*10**6,-20),\"= the concentration,n_i(/cm**3) \"\n"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"1.64e+22 = the concentration,n_i(/cm**3) \n"
]
}
],
"prompt_number": 27
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Ex16.2:pg-315"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"#Example 16.2 : intrinsic carrier\n",
" \n",
"\n",
"#given data :\n",
"e=1.602*10**-19; # Coulomb\n",
"p_i=2*10**-4;# in ohm-m\n",
"mu_n=6;# in m**2/V-sec\n",
"mu_p=0.2;# in m**2/V-sec\n",
"n_i=1/(e*(mu_n+mu_p)*p_i);\n",
"print round(n_i,-19),\"= the intrinsic carrier,n_i(/m**3) \"\n"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"5.03e+21 = the intrinsic carrier,n_i(/m**3) \n"
]
}
],
"prompt_number": 28
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Ex16.3:pg-315"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"#Example 16.3 : neglect the intrinsic conductivity\n",
" \n",
"\n",
"#given data :\n",
"e=1.6*10**-19; # Coulomb\n",
"sigma=10**-12;# in mhos/m\n",
"mu_n=0.18;# in m**2/V-sec\n",
"n=sigma/(e*mu_n);\n",
"N=n; # amount of n type impurity\n",
"print round(N),\"in(/m**3) \"\n",
"# The answer is slightly different in textbook due to approximation"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"34722222.0 in(/m**3) \n"
]
}
],
"prompt_number": 15
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Ex16.4:pg-315"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"#Example 16.4 : number of electron carriers\n",
" \n",
"\n",
"#given data :\n",
"e=1.6*10**-19; # Coulomb\n",
"p=20*10**-2;# in ohm-m\n",
"mu_n=100*10**-4;# in m**2/V-sec\n",
"n=1/(e*mu_n*p);\n",
"print round(n,-19),\"= number of electrons carrier,n(/m**3) \"\n"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"3.12e+21 = number of electrons carrier,n(/m**3) \n"
]
}
],
"prompt_number": 30
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Ex16.5:pg-316"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"#Example 16.5 : concentration of impurity\n",
"import math\n",
"e=1.6*10**-19;# Coulomb\n",
"l=10;#in mm\n",
"d=1;#in mm\n",
"r=100;#in ohms\n",
"up=0.19;#mobilty of electrons in V-sec\n",
"a=(math.pi*((d*10**-3)**2))/4;#area in m**2\n",
"p=((r*a))/(l*10**-3);#resistivity in Ohm-cm\n",
"n=((1/(p*e*up)));#concentration in per m**3\n",
"print round(n,-19),\"is impurity concentration is in per m**3\"\n"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"4.19e+21 is impurity concentration is in per m**3\n"
]
}
],
"prompt_number": 32
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Ex16.6:pg-316"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"#Example 16.6 : intrinsic carrier density\n",
" \n",
"#given data :\n",
"\n",
"e=1.602*10**-19; # in coulomb\n",
"p=3000.0;# in ohm/m\n",
"sigma=1/p;# in ohm/m\n",
"mu_n=0.14;# in m**2/V-sec\n",
"mu_p=0.05;# in m**2/V-sec\n",
"n_i=sigma/(e*(mu_n+mu_p));\n",
"print round(n_i,-13),\"is the concentration,n_i(/m**3) \"\n"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"1.095e+16 is the concentration,n_i(/m**3) \n"
]
}
],
"prompt_number": 39
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Ex16.7:pg-317"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"#Example 16.7 : conductivity\n",
" \n",
"#given data :\n",
"e=1.602*10**-19; # in coulomb\n",
"n_i=5.021*10**15; # in m**-3\n",
"mu_n=0.48;# in m**2/V-sec\n",
"mu_p=0.013;# in m**2/V-sec\n",
"sigma=n_i*(e*(mu_n+mu_p));\n",
"print round(sigma,9),\"= the conductivity,sigma(ohm**-1 m**-1) \"\n"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"0.000396552 = the conductivity,sigma(ohm**-1 m**-1) \n"
]
}
],
"prompt_number": 42
}
],
"metadata": {}
}
]
}