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{
"cells": [
{
"cell_type": "markdown",
"metadata": {},
"source": [
"#9: Physics of Semiconductor Devices"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"##Example number 9.1, Page number 9.14"
]
},
{
"cell_type": "code",
"execution_count": 4,
"metadata": {
"collapsed": false
},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"wavelength of radiation is 0.868 micro m\n"
]
}
],
"source": [
"#importing modules\n",
"import math\n",
"from __future__ import division\n",
"\n",
"#Variable declaration\n",
"h=6.62*10**-34; #planck's constant(J sec)\n",
"c=3*10**8; #velocity of light(m/sec)\n",
"Eg=1.43*1.6*10**-19; #energy gap(J)\n",
"\n",
"#Calculation\n",
"lamda=h*c*10**6/Eg; #wavelength of radiation(micro m)\n",
"\n",
"#Result\n",
"print \"wavelength of radiation is\",round(lamda,3),\"micro m\""
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"##Example number 9.2, Page number 9.28"
]
},
{
"cell_type": "code",
"execution_count": 6,
"metadata": {
"collapsed": false
},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"time taken is 3.7 *10**-9 s\n"
]
}
],
"source": [
"#importing modules\n",
"import math\n",
"from __future__ import division\n",
"\n",
"#Variable declaration\n",
"d=5*10**-6; #thickness(m)\n",
"Dc=3.4*10**-3; #diffusion coefficient(m**2 S-1)\n",
"\n",
"#Calculation\n",
"tow_diff=d**2/(2*Dc); #time taken(s)\n",
"\n",
"#Result\n",
"print \"time taken is\",round(tow_diff*10**9,1),\"*10**-9 s\""
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"##Example number 9.3, Page number 9.28"
]
},
{
"cell_type": "code",
"execution_count": 7,
"metadata": {
"collapsed": false
},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"transit time is 5e-11 s\n"
]
}
],
"source": [
"#importing modules\n",
"import math\n",
"from __future__ import division\n",
"\n",
"#Variable declaration\n",
"w=5*10**-6; #thickness(m)\n",
"vsat=10**5; #velocity(m/s)\n",
"\n",
"#Calculation\n",
"tow_drift=w/vsat; #transit time(s)\n",
"\n",
"#Result\n",
"print \"transit time is\",tow_drift,\"s\""
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"##Example number 9.4, Page number 9.29"
]
},
{
"cell_type": "code",
"execution_count": 16,
"metadata": {
"collapsed": false
},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"diode capacitance is 28.8 pF\n",
"frequency bandwidth is 110 MHz\n",
"answer varies due to rounding off errors\n"
]
}
],
"source": [
"#importing modules\n",
"import math\n",
"from __future__ import division\n",
"\n",
"#Variable declaration\n",
"A=10**-6; #area(m**2)\n",
"e=1.6*10**-19; #charge(coulomb)\n",
"Nd=10**21; #electron concentration(m**-3)\n",
"epsilonr=11.7;\n",
"epsilon0=8.85*10**-12;\n",
"V=10; #potential(V)\n",
"RL=50; #resistance(ohm)\n",
"\n",
"#Calculation\n",
"Cj=(A/2)*math.sqrt(2*e*epsilonr*epsilon0*Nd/V); #diode capacitance(F)\n",
"delta_fel=1/(2*math.pi*RL*Cj); #frequency bandwidth(Hz)\n",
"\n",
"#Result\n",
"print \"diode capacitance is\",round(Cj*10**12,1),\"pF\"\n",
"print \"frequency bandwidth is\",int(delta_fel*10**-6),\"MHz\"\n",
"print \"answer varies due to rounding off errors\""
]
}
],
"metadata": {
"kernelspec": {
"display_name": "Python 2",
"language": "python",
"name": "python2"
},
"language_info": {
"codemirror_mode": {
"name": "ipython",
"version": 2
},
"file_extension": ".py",
"mimetype": "text/x-python",
"name": "python",
"nbconvert_exporter": "python",
"pygments_lexer": "ipython2",
"version": "2.7.9"
}
},
"nbformat": 4,
"nbformat_minor": 0
}
|
