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{
"metadata": {
"name": ""
},
"nbformat": 3,
"nbformat_minor": 0,
"worksheets": [
{
"cells": [
{
"cell_type": "markdown",
"metadata": {},
"source": [
"<h1> Chpater No 7: Optoelectonic Devices <h1>"
]
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 7.1, Page No 283"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"import math \n",
"\n",
"#initialisation of variables\n",
"Vout = 5.0 #in V\n",
"V = 1.5 #ON state voltage drop across LED in V\n",
"I = 5.0 #in mA\n",
"\n",
"#CALCULATIONS\n",
"I = I*10**-3 #in A\n",
"R = (Vout-V)/I #in ohm\n",
"\n",
"#RESULTS\n",
"print('Resistance is =%.f \u03a9' %R)"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Resistance is =700 \u03a9\n"
]
}
],
"prompt_number": 1
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 7.2, Page No 306"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"import math\n",
"\n",
"#initialisation of variables\n",
"N_A = 7.5*10**24 #in atoms/m^3\n",
"N_D = 1.5*10**22 #in atoms/m^3\n",
"D_e = 25*10**-4 #in m^2/s\n",
"D_n = 1*10**-3 #in m^2/s\n",
"V_T = 26*10**-3 #in V\n",
"\n",
"#CALCULATIONS\n",
"Torque_eo = 500*10**-9 #in sec\n",
"Torque_ho = 100*10**-9 #in sec\n",
"e = 1.6*10**-19 #in C\n",
"n_i = 1.5*10**16 #in /m^3\n",
"I_lambda = 12.5 #in mA/cm^2\n",
"I_lambda= I_lambda*10**-3 #in A/cm^2\n",
"L_e = math.sqrt(D_e*Torque_eo) #in m\n",
"L_n = math.sqrt(D_n*Torque_ho) #in m\n",
"J_s = e*((n_i)**2)*( ((D_e)/(L_e*N_A)) + ((D_n)/(L_n*N_D)) ) #in A/m^2\n",
"J_s= J_s*10**-4 #in A/cm^2\n",
"V_OC = V_T*(math.log(1+(I_lambda/J_s))) #in V\n",
"\n",
"#RESULTS\n",
"print('Open circuit voltage is =%.2f volts ' %V_OC)\n"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Open circuit voltage is =0.52 volts \n"
]
}
],
"prompt_number": 2
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 7.3, Page No 307"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"import math\n",
"\n",
"#initialisation of variables\n",
"Phi_o = 1.0*10**21 #in m^-2s^-1\n",
"alpha =1.0*10**5 #in m^-1\n",
"e= 1.6*10**-19 #in C\n",
"\n",
"#CALCULATIONS\n",
"G_L1 = alpha*Phi_o #in m^-3s^-1\n",
"W = 26.0 #in \u00b5m\n",
"W = W * 10**-6 #in m\n",
"G_L2 = alpha*Phi_o*(math.e)**((-alpha)*W) #in m^-3s^-1\n",
"#temp=(1-math.e)**(-(alpha)*W)\n",
"J_L = e*Phi_o*(1-math.e**(-(alpha)*W)) #in A/m^2\n",
"J_L = J_L * 10**3*10**-4 #in mA/cm^2\n",
"\n",
"#RESULTS\n",
"print('Photo current density is =%.1f mA/cm^2' %J_L)"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Photo current density is =14.8 mA/cm^2\n"
]
}
],
"prompt_number": 3
}
],
"metadata": {}
}
]
}
|
