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{
"cells": [
{
"cell_type": "markdown",
"metadata": {},
"source": [
"# Chapter 5: Junction Properties Continued"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"## Example 5.1: Estimate_junction_width.sce"
]
},
{
"cell_type": "code",
"execution_count": null,
"metadata": {
"collapsed": true
},
"outputs": [],
"source": [
"//Exa 5.1\n",
"clc;\n",
"clear;\n",
"close;\n",
"//given data\n",
"ND=10^17;//in atoms/cm^3\n",
"NA=0.5*10^16;//in atoms/cm^3\n",
"Vo=0.7;//in Volts\n",
"V=-10;//in Volts\n",
"ND=ND*10^6;//in atoms/m^3\n",
"NA=NA*10^6;//in atoms/m^3\n",
"epsilon=8.85*10^-11;//in F/m\n",
"e=1.6*10^-19;//coulamb\n",
"//part (i)\n",
"disp('When no external voltage is applied i.e. V=0');\n",
"disp('VB = 0.7 volts');\n",
"VB=0.7;//in Volts\n",
"W=sqrt(2*epsilon*VB*(1/NA+1/ND)/e);//in m\n",
"disp(W,'When no external voltage is applied, Junction width in meter : ');\n",
"//part (ii)\n",
"disp('When external voltage of -10 volt is applied');\n",
"disp('VB = Vo-V volts');\n",
"VB=Vo-V;//in Volts\n",
"W=sqrt(2*epsilon*VB*(1/NA+1/ND)/e);//in m\n",
"disp(W,'When external voltage of -10 Volt is applied, Junction width in meter : ');"
]
}
,
{
"cell_type": "markdown",
"metadata": {},
"source": [
"## Example 5.3: Find_new_position_of_fermi_level.sce"
]
},
{
"cell_type": "code",
"execution_count": null,
"metadata": {
"collapsed": true
},
"outputs": [],
"source": [
"//Exa 5.3\n",
"clc;\n",
"clear;\n",
"close;\n",
"//given data\n",
"Ecf=0.3;//in Volts\n",
"T=27+273;//in Kelvin\n",
"delT=55;//in degree centigrade\n",
"//formula : Ecf=Ec-Ef=K*T*log(nc/ND)\n",
"//let K*log(nc/ND)=y\n",
"//Ecf=Ec-Ef=T*y\n",
"y=Ecf/T;//assumed\n",
"Tnew=273+55;//in Kelvin\n",
"EcfNEW=y*Tnew;//in Volts\n",
"disp(EcfNEW,'New position of fermi level is(eV) : ');"
]
}
,
{
"cell_type": "markdown",
"metadata": {},
"source": [
"## Example 5.4: Calculate_height_of_potential_barrier.sce"
]
},
{
"cell_type": "code",
"execution_count": null,
"metadata": {
"collapsed": true
},
"outputs": [],
"source": [
"//Exa 5.4\n",
"clc;\n",
"clear;\n",
"close;\n",
"//given data\n",
"ND=8*10^14;//in cm^-3\n",
"NA=8*10^14;//in cm^-3\n",
"ni=2*10^13;//in cm^-3\n",
"T=300;//in Kelvin\n",
"k=8.61*10^-5;//in eV/K\n",
"e=1.6*10^-19;//coulamb\n",
"Vo=k*T*log(ND*NA/ni^2);//in Volts\n",
"disp(Vo,'Potential barrier in volts : ');"
]
}
,
{
"cell_type": "markdown",
"metadata": {},
"source": [
"## Example 5.5: Find_electron_and_hole_concentration.sce"
]
},
{
"cell_type": "code",
"execution_count": null,
"metadata": {
"collapsed": true
},
"outputs": [],
"source": [
"//Exa 5.5\n",
"clc;\n",
"clear;\n",
"close;\n",
"//given data\n",
"ND=2*10^16;//in cm^-3\n",
"NA=5*10^15;//in cm^-3\n",
"Ao=4.83*10^21;//constant\n",
"T=300;//in Kelvin\n",
"EG=1.1;//in eV\n",
"kT=0.026;//in eV\n",
"ni=Ao*T^(3/2)*exp(-EG/(2*kT));//in m^-3\n",
"ni=ni*10^-6;//in cm^-3\n",
"p=(ni^2)/ND;//in cm^-3\n",
"n=(ni^2)/NA;//in cm^-3\n",
"disp(p,'Hole concentration in cm^-3 : ');\n",
"disp(n,'electron concentration in cm^-3 : ');\n",
"disp('Since elctron concentration is mote than hole concentration, the given Si is of N-type.');\n",
"//Note : Ans in the book is wrong. Mistake in value putting. "
]
}
,
{
"cell_type": "markdown",
"metadata": {},
"source": [
"## Example 5.6: Determine_junction_capacitance.sce"
]
},
{
"cell_type": "code",
"execution_count": null,
"metadata": {
"collapsed": true
},
"outputs": [],
"source": [
"//Exa 5.6\n",
"clc;\n",
"clear;\n",
"close;\n",
"//given data\n",
"CTzero=50;//in pF\n",
"VR=8;//in Volt\n",
"VK=0.7;//in Volt\n",
"n=1/3;//for Si\n",
"CT=CTzero/((1+VR/VK)^n);//in pF\n",
"disp(CT,'Junction capacitance in pF : ');"
]
}
],
"metadata": {
"kernelspec": {
"display_name": "Scilab",
"language": "scilab",
"name": "scilab"
},
"language_info": {
"file_extension": ".sce",
"help_links": [
{
"text": "MetaKernel Magics",
"url": "https://github.com/calysto/metakernel/blob/master/metakernel/magics/README.md"
}
],
"mimetype": "text/x-octave",
"name": "scilab",
"version": "0.7.1"
}
},
"nbformat": 4,
"nbformat_minor": 0
}
|
