{
"cells": [
{
"cell_type": "markdown",
"metadata": {},
"source": [
"# Ch-9 : Optical Detectors"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"## Ex:9.1 Pg: 374"
]
},
{
"cell_type": "code",
"execution_count": 1,
"metadata": {
"collapsed": false
},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"The responsivity =0.72 Amp/Watt\n"
]
}
],
"source": [
"from __future__ import division\n",
"e_c=550## number of electron collected\n",
"p=800## number of photon incident\n",
"n=e_c/p## quantum efficiency\n",
"e=1.602*10**-19## charge\n",
"h=6.626*10**-34## plank constant\n",
"c=3*10**8## speed of light in m/s\n",
"y=1.3*10**-6# wavelength in m\n",
"R=(n*e*y)/(h*c)## responsivity in A/W\n",
"print \"The responsivity =%0.2f Amp/Watt\"%( R)"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"## Ex:9.2 Pg: 374"
]
},
{
"cell_type": "code",
"execution_count": 2,
"metadata": {
"collapsed": false
},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"The quantum efficiency =40.00 %\n"
]
}
],
"source": [
"from __future__ import division\n",
"e=1.602*10**-19## charge\n",
"h=6.626*10**-34## plank constant\n",
"c=3*10**8## speed of light in m/s\n",
"y=0.85*10**-6# wavelength in m\n",
"R=0.274## responsivity in A/W\n",
"n=(R*h*c)/(e*y)## quantum efficiency\n",
"n1=n*100## % of quantum efficiency\n",
"print \"The quantum efficiency =%0.2f %%\"%( n1)"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"## Ex:9.3 Pg: 374"
]
},
{
"cell_type": "code",
"execution_count": 3,
"metadata": {
"collapsed": false
},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"The quantum efficiency =33.33 %\n",
"\n",
" band gap energy =24.85*10**-20 J\n",
"\n",
" The output photo current =21.49 nA\n"
]
}
],
"source": [
"from __future__ import division\n",
"e_c=1## number of electron collected\n",
"p=3## number of photon incident\n",
"n=e_c/p## quantum efficiency\n",
"e=1.602*10**-19## charge\n",
"h=6.626*10**-34## plank constant\n",
"c=3*10**8## speed of light in m/s\n",
"y=0.8*10**-6# wavelength in m\n",
"Eg=(h*c)/y## band gap energy in J\n",
"R=(n*e*y)/(h*c)## responsivity in A/W\n",
"Po=10**-7## in W\n",
"Ip=R*Po## output photo current\n",
"print \"The quantum efficiency =%0.2f %%\"%( n*100)#\n",
"print \"\\n band gap energy =%0.2f*10**-20 J\"%( Eg*10**20)#\n",
"print \"\\n The output photo current =%0.2f nA\"%( Ip*10**9)"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"## Ex:9.4 Pg: 375"
]
},
{
"cell_type": "code",
"execution_count": 4,
"metadata": {
"collapsed": false
},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"The responsivity =0.34 A/W\n",
"\n",
" The received optical power =2.92 uW\n",
"\n",
" The number of received photons =1.25*10**13 photons/sec\n"
]
}
],
"source": [
"from __future__ import division\n",
"n=0.50## quantum efficiency\n",
"e=1.602*10**-19## charge\n",
"h=6.626*10**-34## plank constant\n",
"c=3*10**8## speed of light in m/s\n",
"y=0.85*10**-6# wavelength in m\n",
"R=(n*e*y)/(h*c)## responsivity in A/W\n",
"Ip=10**-6## mean photo current\n",
"Po=Ip/R## received optical power in W\n",
"f=c/y#\n",
"re=(n*Po)/(h*f)#\n",
"rp=re/n## number of received photons\n",
"print \"The responsivity =%0.2f A/W\"%( R)#\n",
"print \"\\n The received optical power =%0.2f uW\"%( Po*10**6)#\n",
"print \"\\n The number of received photons =%0.2f*10**13 photons/sec\"%( rp/10**13)"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"## Ex:9.5 Pg: 375"
]
},
{
"cell_type": "code",
"execution_count": 5,
"metadata": {
"collapsed": false
},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"The cut off wavelength =0.87 um\n"
]
}
],
"source": [
"from __future__ import division\n",
"h=6.626*10**-34## plank constant\n",
"c=3*10**8## speed of light in m/s\n",
"Eg=1.43## in eV\n",
"Eg1=Eg*1.602*10**-19## in J\n",
"y=(h*c)/Eg1## cut off wavelength in m\n",
"print \"The cut off wavelength =%0.2f um\"%( y*10**6)"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"## Ex:9.6 Pg: 376"
]
},
{
"cell_type": "code",
"execution_count": 6,
"metadata": {
"collapsed": false
},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"The max response time =7.54 ns\n"
]
}
],
"source": [
"from math import pi\n",
"from __future__ import division\n",
"vd=2.5*10**4## carrier velocity in m/s\n",
"w=30*10**-6## width in m\n",
"Bm=vd/(2*pi*w)#\n",
"Tm=1/Bm## max response time in sec\n",
"Tm1=Tm*10**9## max response time in ns\n",
"print \"The max response time =%0.2f ns\"%( Tm1)"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"## Ex:9.7 Pg: 376"
]
},
{
"cell_type": "code",
"execution_count": 7,
"metadata": {
"collapsed": false
},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"The multiplication factor =58\n"
]
}
],
"source": [
"from math import ceil,pi\n",
"from __future__ import division\n",
"n=0.65## quantum efficiency\n",
"e=1.602*10**-19## charge\n",
"h=6.626*10**-34## plank constant\n",
"c=3*10**8## speed of light in m/s\n",
"y=0.85*10**-6# wavelength in m\n",
"R=(n*e*y)/(h*c)## responsivity in A/W\n",
"Po=0.35*10**-6## in W\n",
"Ip=R*Po## output photo current\n",
"I=9*10**-6## output current in A\n",
"M=I/Ip## multiplication factor\n",
"M1=ceil(M)#\n",
"print \"The multiplication factor =%d\"%( M1)"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"## Ex:9.8 Pg: 377"
]
},
{
"cell_type": "code",
"execution_count": 1,
"metadata": {
"collapsed": false
},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"The cut off wavelength =1.33 um\n",
"\n",
" The responsivity =0.53 A/W \n",
"\n",
" The incident optical power =5.06 uW\n"
]
}
],
"source": [
"from __future__ import division\n",
"n=0.50## quantum efficiency\n",
"e=1.602*10**-19## charge\n",
"h=6.626*10**-34## plank constant\n",
"c=3*10**8## speed of light in m/s\n",
"Eg=1.5*10**-19## in J\n",
"y=(h*c)/Eg## cut off wavelength in m\n",
"f=c/y#\n",
"R=(n*e)/(h*f)## responsivity in A/W\n",
"Ip=2.7*10**-6## photo current in A\n",
"Po=Ip/R## incident optical power in W\n",
"Po1=Po*10**6## incident optical power in uW\n",
"print \"The cut off wavelength =%0.2f um\"%( y*10**6)#\n",
"print \"\\n The responsivity =%0.2f A/W \"%( R)#\n",
"print \"\\n The incident optical power =%0.2f uW\"%( Po1)"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"## Ex:9.9 Pg: 377"
]
},
{
"cell_type": "code",
"execution_count": 2,
"metadata": {
"collapsed": false
},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"The responsivity =0.10 A/W \n"
]
}
],
"source": [
"from __future__ import division\n",
"n=0.15## quantum efficiency\n",
"e=1.6*10**-19## charge\n",
"h=6.63*10**-34## plank constant\n",
"c=3*10**8## speed of light in m/s\n",
"y=0.85*10**-6## cut off wavelength in m\n",
"f=c/y## frequency in Hz\n",
"R=(n*e)/(h*f)## responsivity in A/W\n",
"print \"The responsivity =%0.2f A/W \"%( R)"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"## Ex:9.10 Pg: 377"
]
},
{
"cell_type": "code",
"execution_count": 3,
"metadata": {
"collapsed": false
},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"The responsivity =0.10 A/W \n",
"\n",
" The external quantum efficiency =14.59% \n"
]
}
],
"source": [
"from __future__ import division\n",
"Iph=75*10**-6## output photocurrent in A\n",
"y=0.85## operating wavelength in um\n",
"Pi=750*10**-6## incident optical power in uW\n",
"R=Iph/Pi## responsivity in A/W\n",
"n=1.24*R/y## external quantum efficiency\n",
"n1=n*100## percentage of external quantum efficiency\n",
"print \"The responsivity =%0.2f A/W \"%( R)#\n",
"print \"\\n The external quantum efficiency =%0.2f%% \"%( n1)"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"## Ex:9.11 Pg: 378"
]
},
{
"cell_type": "code",
"execution_count": 4,
"metadata": {
"collapsed": false
},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"The transit time =70.00 ps\n"
]
}
],
"source": [
"from __future__ import division\n",
"Vs=10**5## saturation in m/s\n",
"W=7*10**-6## depletion layer width in m\n",
"tr=W/Vs## transit time in sec\n",
"print \"The transit time =%0.2f ps\"%( tr*10**12)"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"## Ex:9.12 Pg: 378"
]
},
{
"cell_type": "code",
"execution_count": 6,
"metadata": {
"collapsed": false
},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"The max 3 dB bandwidth =420 MHz\n",
"\n",
" The answer is wrong in the textbook\n"
]
}
],
"source": [
"from __future__ import division\n",
"Vs=3*10**4## saturation in m/s\n",
"W=25*10**-6## depletion layer width in m\n",
"tr=W/Vs## transit time in sec\n",
"f=0.35/tr## max 3 dB bandwidth Hz\n",
"f1=f/10**6## max 3 dB bandwidth Hz\n",
"print \"The max 3 dB bandwidth =%d MHz\"%( f1)#\n",
"print \"\\n The answer is wrong in the textbook\""
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"## Ex:9.13 Pg: 378"
]
},
{
"cell_type": "code",
"execution_count": 7,
"metadata": {
"collapsed": false
},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"The transit time =0.83 ns\n",
"\n",
" The junction capacitance =1.05 pF\n",
"\n",
" The time constant =15.75 us\n"
]
}
],
"source": [
"from __future__ import division\n",
"Vs=3*10**4## saturation in m/s\n",
"W=25*10**-6## depletion layer width in m\n",
"E=10.5*10**-11## in F/m\n",
"RL=15*10**6## load resister in ohm\n",
"A=0.25*10**-6## area in m**2\n",
"tr=W/Vs## transit time in sec\n",
"Cj=E*A/W## junction capacitance in F\n",
"t=RL*Cj## time constant in sec\n",
"print \"The transit time =%0.2f ns\"%( tr*10**9)#\n",
"print \"\\n The junction capacitance =%0.2f pF\"%( Cj*10**12)#\n",
"print \"\\n The time constant =%0.2f us\"%( t*10**6)"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"## Ex:9.14 Pg: 379"
]
},
{
"cell_type": "code",
"execution_count": 8,
"metadata": {
"collapsed": false
},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"The cut off wavelength for Si =1.11 um\n",
"\n",
" The cut off wavelength for Ge =1.86 um\n"
]
}
],
"source": [
"from __future__ import division\n",
"Eg1=1.12## band gap for Si in eV\n",
"Eg2=0.667## band gap for Ge in eV\n",
"y_si=1.24/Eg1## cut off wavelength for Si in um\n",
"y_he=1.24/Eg2## cut off wavelength for Ge in um\n",
"print \"The cut off wavelength for Si =%0.2f um\"%( y_si)#\n",
"print \"\\n The cut off wavelength for Ge =%0.2f um\"%( y_he)"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"## Ex:9.15 Pg: 379"
]
},
{
"cell_type": "code",
"execution_count": 9,
"metadata": {
"collapsed": false
},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"The responsivity =0.36 A/W\n",
"\n",
" The received optical power =2.76 uW\n",
"\n",
" The number of received photons =1.25*10**13 photons/sec\n"
]
}
],
"source": [
"from __future__ import division\n",
"n=0.50## quantum efficiency\n",
"e=1.6*10**-19## charge\n",
"h=6.626*10**-34## plank constant\n",
"c=3*10**8## speed of light in m/s\n",
"y=0.9*10**-6# wavelength in m\n",
"R=(n*e*y)/(h*c)## responsivity in A/W\n",
"Ip=10**-6## mean photo current\n",
"Po=Ip/R## received optical power in W\n",
"f=c/y#\n",
"re=(n*Po)/(h*f)#\n",
"rp=re/n## number of received photons\n",
"print \"The responsivity =%0.2f A/W\"%( R)#\n",
"print \"\\n The received optical power =%0.2f uW\"%( Po*10**6)#\n",
"print \"\\n The number of received photons =%0.2f*10**13 photons/sec\"%( rp/10**13)"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"## Ex:9.16 Pg: 379"
]
},
{
"cell_type": "code",
"execution_count": 10,
"metadata": {
"collapsed": false
},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"The photon current =80 uA\n"
]
}
],
"source": [
"from __future__ import division\n",
"R=0.40## Responsivity in A/W\n",
"m=100*10**-6## incident flux in W/m-m\n",
"A=2## area in m-m\n",
"Po=m*A## incident power in W\n",
"Ip=R*Po## photon current in A\n",
"print \"The photon current =%d uA\"%( Ip*10**6)"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"## Ex:9.17 Pg: 380"
]
},
{
"cell_type": "code",
"execution_count": 11,
"metadata": {
"collapsed": false
},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"The cut off wavelength =1.33 um\n",
"\n",
" The responsivity =0.69 A/W \n",
"\n",
" The incident optical power =3.60 uW\n"
]
}
],
"source": [
"from __future__ import division\n",
"n=0.65## quantum efficiency\n",
"e=1.602*10**-19## charge\n",
"h=6.626*10**-34## plank constant\n",
"c=3*10**8## speed of light in m/s\n",
"Eg=1.5*10**-19## in J\n",
"y=(h*c)/Eg## cut off wavelength in m\n",
"f=c/y#\n",
"R=(n*e)/(h*f)## responsivity in A/W\n",
"Ip=2.5*10**-6## photo current in A\n",
"Po=Ip/R## incident optical power in W\n",
"Po1=Po*10**6## incident optical power in uW\n",
"print \"The cut off wavelength =%0.2f um\"%( y*10**6)#\n",
"print \"\\n The responsivity =%0.2f A/W \"%( R)#\n",
"print \"\\n The incident optical power =%0.2f uW\"%( Po1)"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"## Ex:9.18 Pg: 380"
]
},
{
"cell_type": "code",
"execution_count": 12,
"metadata": {
"collapsed": false
},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"The cut off wavelength =0.87 um\n"
]
}
],
"source": [
"from __future__ import division\n",
"h=6.626*10**-34## plank constant\n",
"c=3*10**8## speed of light in m/s\n",
"Eg=1.43## in eV\n",
"Eg1=Eg*1.602*10**-19## in J\n",
"y=(h*c)/Eg1## cut off wavelength in m\n",
"print \"The cut off wavelength =%0.2f um\"%( y*10**6)"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"## Ex:9.19 Pg: 381"
]
},
{
"cell_type": "code",
"execution_count": 13,
"metadata": {
"collapsed": false
},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"The optical gain =0.17\n",
"\n",
" The common emitter gain =0.38\n"
]
}
],
"source": [
"from __future__ import division\n",
"n=0.45## quantum efficiency\n",
"h=6.62*10**-34## plank constant\n",
"c=3*10**8## speed of light in m/s\n",
"y=1.2*10**-6## cut off wavelength in m\n",
"Ic=20*10**-6## collector current in A\n",
"Po=120*10**-6## incident optical power in W\n",
"e=1.602*10**-19## charge\n",
"Go=(h*c*Ic)/(y*Po*e)## optical gain\n",
"h_e=Go/n## common emitter gain\n",
"print \"The optical gain =%0.2f\"%( Go)#\n",
"print \"\\n The common emitter gain =%0.2f\"%( h_e)"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"## Ex:9.20 Pg: 381"
]
},
{
"cell_type": "code",
"execution_count": 14,
"metadata": {
"collapsed": false
},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"The multiplication factor =38\n"
]
}
],
"source": [
"from __future__ import division\n",
"n=0.5## quantum efficiency\n",
"e=1.602*10**-19## charge\n",
"h=6.626*10**-34## plank constant\n",
"c=3*10**8## speed of light in m/s\n",
"y=1.3*10**-6# wavelength in m\n",
"R=(n*e*y)/(h*c)## responsivity in A/W\n",
"Po=0.4*10**-6## in W\n",
"Ip=R*Po## output photo current\n",
"I=8*10**-6## output current in A\n",
"M=I/Ip## multiplication factor\n",
"print \"The multiplication factor =%d\"%( M)"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"## Ex:9.21 Pg: 382"
]
},
{
"cell_type": "code",
"execution_count": 15,
"metadata": {
"collapsed": false
},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"The multiplication factor =27\n"
]
}
],
"source": [
"from __future__ import division\n",
"n=0.85## quantum efficiency\n",
"e=1.6*10**-19## charge\n",
"h=6.625*10**-34## plank constant\n",
"c=3*10**8## speed of light in m/s\n",
"y=0.9*10**-6# wavelength in m\n",
"R=(n*e*y)/(h*c)## responsivity in A/W\n",
"Po=0.6*10**-6## in W\n",
"Ip=R*Po## output photo current\n",
"I=10*10**-6## output current in A\n",
"M=I/Ip## multiplication factor\n",
"print \"The multiplication factor =%d\"%( M)"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"## Ex:9.22 Pg: 382"
]
},
{
"cell_type": "code",
"execution_count": 16,
"metadata": {
"collapsed": false
},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"The quantum efficiency =60 %\n",
"\n",
" The wavelength =1.33 um\n",
"\n",
" The responsivity =0.64 Amp/Watt\n",
"\n",
" The incident optical power =4.06 uW\n"
]
}
],
"source": [
"from __future__ import division\n",
"e_c=1.2*10**11## number of electron collected\n",
"p=2*10**11## number of photon incident\n",
"n=e_c/p## quantum efficiency\n",
"e=1.602*10**-19## charge\n",
"h=6.626*10**-34## plank constant\n",
"c=3*10**8## speed of light in m/s\n",
"E=1.5*10**-19## energy in J\n",
"y=(h*c)/E# wavelength in m\n",
"R=(n*e*y)/(h*c)## responsivity in A/W\n",
"Ip=2.6*10**-6## photocurrent in A\n",
"Po=Ip/R## incident optical power in W\n",
"print \"The quantum efficiency =%d %%\"%( n*100)#\n",
"print \"\\n The wavelength =%0.2f um\"%( y*10**6)#\n",
"print \"\\n The responsivity =%0.2f Amp/Watt\"%( R)#\n",
"print \"\\n The incident optical power =%0.2f uW\"%( Po*10**6)"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"## Ex:9.23 Pg: 383"
]
},
{
"cell_type": "code",
"execution_count": 17,
"metadata": {
"collapsed": false
},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"The multiplication factor =56\n"
]
}
],
"source": [
"from __future__ import division\n",
"n=0.40## quantum efficiency\n",
"e=1.602*10**-19## charge\n",
"h=6.626*10**-34## plank constant\n",
"c=3*10**8## speed of light in m/s\n",
"y=1.35*10**-6# wavelength in m\n",
"R=(n*e*y)/(h*c)## responsivity in A/W\n",
"Po=0.2*10**-6## in W\n",
"Ip=R*Po## output photo current\n",
"I=4.9*10**-6## output current in A\n",
"M=I/Ip## multiplication factor\n",
"print \"The multiplication factor =%d\"%( M)"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"## Ex:9.24 Pg: 383"
]
},
{
"cell_type": "code",
"execution_count": 18,
"metadata": {
"collapsed": false
},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"The responsivity =0.38 A/W\n",
"\n",
" The received optical power =5.31 uW\n",
"\n",
" The number of received photons =1.25*10**13 photons/sec\n"
]
}
],
"source": [
"from __future__ import division\n",
"n=0.55## quantum efficiency\n",
"e=1.6*10**-19## charge\n",
"h=6.626*10**-34## plank constant\n",
"c=3*10**8## speed of light in m/s\n",
"y=0.85*10**-6# wavelength in m\n",
"R=(n*e*y)/(h*c)## responsivity in A/W\n",
"Ip=2*10**-6## mean photo current\n",
"Po=Ip/R## received optical power in W\n",
"re=(n*Po*y)/(h*c)## number of received photons\n",
"print \"The responsivity =%0.2f A/W\"%( R)#\n",
"print \"\\n The received optical power =%0.2f uW\"%( Po*10**6)#\n",
"print \"\\n The number of received photons =%0.2f*10**13 photons/sec\"%( re/10**13)"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"## Ex:9.25 Pg: 384"
]
},
{
"cell_type": "code",
"execution_count": 19,
"metadata": {
"collapsed": false
},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"The wavelength =1.53 um\n",
"\n",
" The output power =1.30 uW\n",
"\n",
" The photocurrent =28.84 uA\n"
]
}
],
"source": [
"from __future__ import division\n",
"h=6.625*10**-34## plank constant\n",
"c=3*10**8## speed of light in m/s\n",
"n=1## quantum efficiency\n",
"e=1.602*10**-19## charge\n",
"E=1.3*10**-19## energy in J\n",
"y=(h*c)/E## wavelength in m\n",
"M=18## multiplication factor\n",
"rp=10**13## no. of photon per sec\n",
"Po=rp*E## output power in w\n",
"Ip=(n*Po*e)/E## output photocurrent in A\n",
"I=M*Ip## photocurrent in A\n",
"print \"The wavelength =%0.2f um\"%( y*10**6)#\n",
"print \"\\n The output power =%0.2f uW\"%( Po*10**6)#\n",
"print \"\\n The photocurrent =%0.2f uA\"%( I*10**6)"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"## Ex:9.26 Pg: 384"
]
},
{
"cell_type": "code",
"execution_count": 20,
"metadata": {
"collapsed": false
},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"The quantum efficiency =40 %\n",
"\n",
" The bandgap energy =2.34*10**-19 J\n",
"\n",
" The bandgap energy =1.46 eV\n",
"\n",
" The mean output photocurrent =2.74 uA\n"
]
}
],
"source": [
"from __future__ import division\n",
"e_c=2*10**10## number of electron collected\n",
"p=5*10**10## number of photon incident\n",
"n=e_c/p## quantum efficiency\n",
"e=1.602*10**-19## charge\n",
"h=6.626*10**-34## plank constant\n",
"c=3*10**8## speed of light in m/s\n",
"y=0.85*10**-6## wavelength in m\n",
"y1=0.85## wavelength in um\n",
"Eg=(h*c)/y## bandgap energy in J\n",
"Eg1=1.24/y1## bandgap energy in terms of eV\n",
"Po=10*10**-6## incident power in W\n",
"Ip=(n*e*Po)/Eg## mean output photocurrent in A\n",
"print \"The quantum efficiency =%d %%\"%( n*100)#\n",
"print \"\\n The bandgap energy =%0.2f*10**-19 J\"%( Eg*10**19)#\n",
"print \"\\n The bandgap energy =%0.2f eV\"%( Eg1)#\n",
"print \"\\n The mean output photocurrent =%0.2f uA\"%( Ip*10**6)"
]
}
],
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