PH8252 – NOTES & QP
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PH8252 – 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 — 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 band gap semiconductors — Carrier concentration in intrinsic semiconductors — extrinsic semiconductors — Carrier concentration in N-type & P-type semiconductors — Variation of carrier concentration with temperature — variation of Fermi level with temperature and impurity concentration — Carrier transport in Semiconductor: random motion, drift, mobility and diffusion — Hall effect and devices — Ohmic contacts — Schottky diode.
UNIT III MAGNETIC PROPERTIES OF MATERIALS
Magnetic dipole moment — atomic magnetic moments- magnetic permeability and susceptibility — Magnetic material classification: diamagnetism — paramagnetism — ferromagnetism — antiferromagnetism — ferrimagnetism — Ferromagnetism: origin and exchange interaction- saturation magnetization and Curie temperature — Domain Theory- M versus H behaviour — Hard and soft magnetic materials — examples and uses— Magnetic principle in computer data storage — Magnetic hard disc (GMR sensor).
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 — LED — Organic LED — Laser diodes — Optical data storage techniques.
UNIT V NANO DEVICES
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 structure — Band gap of nanomaterials — Tunneling: single electron phenomena and single electron transistor — Quantum dot laser. Conductivity of metallic nanowires — Ballistic transport — Quantum resistance and conductance — Carbon nanotubes: Properties and applications.