PH3251 – NOTES & QP
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PH3251 – SYLLABUS
UNIT I – CRYSTALLOGRAPHY
Crystal structures: BCC, FCC and HCP – directions and planes – linear and planar densities – crystal imperfections- edge and screw dislocations – grain and twin boundaries – Burgers vector and elastic strain energy- Slip systems, plastic deformation of materials – Polymorphism – phase changes – nucleation and growth – homogeneous and heterogeneous nucleation.
UNIT II – ELECTRICAL AND MAGNETIC PROPERTIES OF MATERIALS
Classical free electron theory – Expression for electrical conductivity – Thermal conductivity, expression – Quantum free electron theory :Tunneling – 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. Magnetic materials: Dia, para and ferromagnetic effects – paramagnetism in the conduction electrons in metals – exchange interaction and ferromagnetism – quantum interference devices – GMR devices.
UNIT III – SEMICONDUCTORS AND TRANSPORT 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 – Carrier transport in Semiconductors: Drift, mobility and diffusion – Hall effect and devices – Ohmic contacts – Schottky diode.
UNIT IV – OPTICAL PROPERTIES OF MATERIALS
Classification of optical materials – Optical processes in semiconductors: optical absorption and emission, charge injection and recombination, optical absorption, loss and gain. Optical processes in quantum wells – Optoelectronic devices: light detectors and solar cells – light emitting diode – laser diode – optical processes in organic semiconductor devices –excitonic state – Electro-optics and nonlinear optics: Modulators and switching devices – plasmonics.
UNIT V – NANOELECTRONIC DEVICES
Quantum confinement – Quantum structures – quantum wells, wires and dots – Zener-Bloch oscillations – Resonant tunneling – quantum interference effects – mesoscopic structures – Single electron phenomena – Single electron Transistor. Semiconductor photonic structures – 1D, 2D and 3D photonic crystal. Active and passive optoelectronic devices – photo processes – spintronics – carbon nanotubes: Properties and applications.