TAILIEUCHUNG - Lecture Electrical Engineering: Lecture 6 - Dr. Nasim Zafar

Upon completion of this topic on P-N Junctions, you will be able to appreciate: Knowledge of the formation of p-n junctions to explain the diode operation and to draw its I-V characteristics. so that you can draw the band diagram to explain their I-V characteristics and functionalities. Diode break down mechanisms; including the Avalanche breakdown and Zenor break down; The Zener Diodes. | Dr. Nasim Zafar Electronics 1 EEE 231 – BS Electrical Engineering Fall Semester – 2012 COMSATS Institute of Information Technology Virtual campus Islamabad Revision: 1. Semiconductor Materials: Elemental semiconductors Intrinsic and Extrinsic Semiconductor Compound semiconductors III – V Gap, GaAs II – V ZnS, CdTe Mixed or Tertiary Compounds . GaAsP 2. Applications: Si diodes, rectifiers, transistors and integrated circuits etc GaAs, GaP emission and absorption of light ZnS fluorescent materials Revision: 3. The Band Theory of Solids Quantum Mechanics discrete energy levels S1 – P3 – model for four valency Si – atom in the diamond lattice four nearest neighbors Sharing of four electrons S1 – P3 – level, the covalent bonding! Pauli’s Exclusion principle for overlapping S1 – P3 electron wave functions Bands 3 Revision: 4. Band Gap and Material Classification Insulators Eg: 5 – 8 eV Semiconductor Eg: eV – 2/3 eV Metals overlapping The classification takes into account Electronic configuration Energy Band-gap Examples: Wide: Eg 5 eV (diamond) Eg ~ 8 eV (SiO2) Narrow: Eg = Si = , GaAs = 5. Charge Carriers in Semiconductors Electrons and Holes in Semiconductors Intrinsic Materials Doped – Extrinsic Materials Effective Mass Hydrogenic Model: Lecture No: 6 P-N Junction - Semiconductor Diodes Outcome: Upon completion of this topic on P-N Junctions, you will be able to appreciate: Knowledge of the formation of p-n junctions to explain the diode operation and to draw its I-V characteristics. so that you can draw the band diagram to explain their I-V characteristics and functionalities. Diode break down mechanisms; including the Avalanche breakdown and Zenor break down; The Zener Diodes. Understanding of the operation mechanism of solar cells, LEDs, lasers and FETs. Semiconductor Devices: Semiconductor devices are electronic components that use the electronic properties of .

• Điện - Điện tử
• Electrical engineering
• Electronic devices
• Lecture Electrical Engineering
• Semiconductor materials
• Carrier transport in semiconductors
• Bipolar Junction Transistors
• electrical
• electronic and electrical industry
• electrical professional
• specialized dictionaries li arts
• Electrical Engineering Dictionary
• The electrical engineering handbook
• The electrical engineering
• The hall effect
• Power systems
• Electrical machines
• Digital devices
• Computer engineering
• Electrical Engineering Dictionar
• Summary of mechanical engineering and engineering mechanics doctoral thesis
• The mechanical model and calculating design
• Electrical generator for sea wave energy
• The electrical generator
• Vietnams sea condition
• Passive components
• Voltage and current sources
• Linear circuit analysis
• Passive signal processing
• Microelectronic circuits
• Integrated electronics
• Biasing stability
• Fixed bias circuits
• Amplifier gain
• Common emitter amplifier
• Common emitter characteristics
• Small signal operation
• BJT amplifier circuits
• Discrete circuit design
• Transistor amplifier
• DC Analysis
• Characteristic parameters
• BJT internal capacitances
• High frequency BJT model
• Qualitative operation of MOSFET
• Channel for current flow
• MOS field effect transistors
• Current voltage characteristics
• Circuit symbol
• MOSFET Circuit
• Voltage biasing scheme
• Fixing voltage
• Semiconductor devices