Electronic Devices - Introductory Lecture

Course Overview

• Subject: Electronic Devices
• Focus: Understanding various electronic devices encountered in daily life (e.g., TV, mobile phones, cameras, projectors).
• Structure: 5 units, each with a specific course outcome.

Why Study Electronic Devices?

• Understanding electronics basics enables application of knowledge in manufacturing, working principles, and circuit design.

Basic Concepts

What is Electronics?

• Branch of physics and technology
• Design of circuits using transistors, microchips.
• Behavior and movement of electrons in a system (semiconductor, conductor, vacuum, or gas).
• Deals with the emission, flow, and control of electrons in vacuum or matter.

What are Electronic Devices?

• Devices utilizing and controlling laws of electron motion in vacuum, gas, or solids.
• Categories: Electric vacuum devices, Gas tube devices, Solid-state electronics.

Unit Breakdown

Unit 1: Semiconductor Physics and Quantum Mechanics

• Semiconductor Physics: Study of materials important for modern technology.
• Quantum Mechanics: Mathematical description of motion and interaction of subatomic particles.
  • Concepts: Quantization of energy, wave-particle duality, uncertainty principle, and correspondence principle.
• Course Outcome: Understand basic concepts of electronics and quantum mechanics.

Unit 2: Energy Bands and Carrier Transport

• Study of intrinsic (pure) and extrinsic (impurity added) silicon.
• Topics: Energy bands, carrier transport, diffusion current, drift current, mobility, resistivity.
• Course Outcome: Explain energy bands in semiconductors, drift current, and diffusion current.

Unit 3: PN Junctions and Carrier Recombination

• Topics: Generation and recombination of carriers, Poisson and continuity equations, PN junction characteristics, IV characteristics, small-signal switching models.
• Course Outcome: Analyze PN junction characteristics.

Unit 4: Diode Breakdown and BJTs

• Breakdown Mechanisms: Avalanche breakdown, zener breakdown.
• Study of Zener diode, Schottky diode, Bipolar Junction Transistor (BJT)
  • BJT: Three-terminal device (base, collector, emitter).
  • Ebers-Moll model: Simple representation of transistor as a circuit model.
• Course Outcome: Explain the breakdown mechanism and BJT.

Unit 5: MOS Capacitors and Optoelectronic Devices

• Topics: MOS capacitor, CV characteristics, MOSFET (metal oxide semiconductor field-effect transistor), IV characteristics, small signal models for MOS transistors, LED, photodiodes, solar cells.
• Course Outcome: Explain the concept of MOSFET, its working, and optoelectronic devices.

Additional Resources

• Recommended Books:
  • Streetman, Solid State Electronic Devices
  • Davis, Semiconductor Physics and Devices
  • SMZ, CETISA
• Lecture notes and videos will be provided for all units.

Final Note

• Consistent engagement with lectures and notes is essential for understanding the subject thoroughly.

Thank you for listening!