P n junction equilibrium conditions 1 2 3 contact

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Unformatted text preview: 13 EE 332 Semiconductor Materials and Devices Lecture 15. P-N Junction – Equilibrium Conditions 1.  2.  3.  Contact potential Equilibrium Fermi levels Space charge Vacuum Tube Diode Diode 2 ports Anode electron flow Filament Edison effect: A diode tube is connected in two configurations, one has a flow of electrons, ‘Space charge’, and the other does not. Cathode temperature: ~ 2000 K EE 332 Spring 2013 Diode Diode EE 332 Spring 2013 Photodiode and Light-Emitting Diode Optoelectronic devices: PD and LED Conversion between optical and electrical energies. EE 332 Spring 2013 Diode Full Diode -wave rectifier Diodealf-wave rectifier H Half-wave rectifier Diode-Transistor Logic (NAND gate) FFullwave rectifier ull- -wave rectifier Diode-Transistor Logic (NAND gate) Diode-Transistor Logic (NAND gate) EE 332 Spring 2013 P-N Junction •  Cartoon EE 332 Spring 2013 P-N Junction P-N Junction •  A p-n junction diode is made of forming a p-type region of material directly next to a n-type region. EE 332 Spring 2013 Doping Concentration in Step Junction Doping Concentration in Step Junction •  P-N Junction EE 332 Spring 2013 Fabrication of P-N Junctions •  •  Start w...
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