PH8253 – NOTES & QP
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PH8253 – SYLLABUS
UNIT I ELECTRICAL PROPERTIES OF MATERIALS
Classical free electron theory — Expression for electrical conductivity — Thermal conductivity, expression — Wiedemann-Franz law — Success and failures — electrons in metals — Particle in a three dimensional box — degenerate states — Fermi- Dirac statistics — Density of energy states — Electron in periodic potential: Bloch thorem — metals and insulators — Energy bands in solids– tight binding approximation — Electron effective mass — concept of hole.
UNIT II SEMICONDUCTOR PHYSICS
Intrinsic Semiconductors — Energy band diagram — direct and indirect semiconductors — Carrier concentration in intrinsic semiconductors — extrinsic semiconductors — Carrier concentration in Ntype
& P-type semiconductors — Carrier transport: Velocity-electric field relations — drift and diffusion transport — Einstein?s relation — Hall effect and devices — Zener and avalanche breakdown in p-n
junctions — Ohmic contacts — tunnel diode — Schottky diode — MOS capacitor — power transistor.
UNIT III MAGNETIC AND DIELECTRIC PROPERTIES OF MATERIALS
Magnetism in materials — magnetic field and induction — magnetization — magnetic permeability and susceptibility–types of magnetic materials — microscopic classification of magnetic materials — Ferromagnetism: origin and exchange interaction- saturation magnetization and Curie temperature — Domain Theory. Dielectric materials: Polarization processes — dielectric loss — internal field — Clausius-Mosotti relation- dielectric breakdown — high-k dielectrics.
UNIT IV OPTICAL PROPERTIES OF MATERIALS
Classification of optical materials — carrier generation and recombination processes — Absorption emission and scattering of light in metals, insulators and Semiconductors (concepts only) — photo
current in a P- N diode — solar cell –photo detectors — LED — Organic LED — Laser diodes — excitons — quantum confined Stark effect — quantum dot laser.
UNIT V NANOELECTRONIC DEVICES
Introduction — electron density in bulk material — Size dependence of Fermi energy– quantum confinement — quantum structures — Density of states in quantum well, quantum wire and quantum dot structures –Zener-Bloch oscillations — resonant tunneling — quantum interference effects — mesoscopic structures: conductance fluctuations and coherent transport — Coulomb blockade effects — Single electron phenomena and Single electron Transistor — magnetic semiconductors– spintronics — Carbon nanotubes: Properties and applications.