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Topics and Sample Questions for Oral Exam for PhD Qualifiers – 1/26/09

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Materials Science, Electronic and Photonic Materials

1. Crystal Structure: Directions and planes

2. Lattice vibrations: Acoustical and optical branches; phonons

3. Thermal properties: Specific heats. Thermal expansion, Thermal conductivity

4. Diffusion, Fick’s Laws

5. Mechanical behavior. Plastic and elastic deformations. Young’s modulus

6. Phases, phase diagram. One component and binary systems. The Gibbs Phase rule.

7. Magnetic Properties. Basic concepts. Magnetic moment and permeability. Paramagnetic, ferromagnetic, antiferromagnetic materials

8. Electrical properties of metals and semiconductors. Hall effect. Intrinsic and extrinsic semiconductors; electrons and holes, electrical conductivity, statistics of electrons and holes, recombination and injection, life-time. (Electrical Properties) (Transport)

9. Electric permittivity and susceptibility in dielectrics (Lorentz model) and in metals (Drude model).Freederickz Transition and Dielectric Anisotropy

10. Basics of semiconductor devices. Concept of p-n junction, Schottky junction and its electronic properties, MOS structure and basics of the field-effect, structure and operation principles of the bipolar transistors, basics of photonics devices (LED, photodetectors, solar cells, semiconductor lasers) (Electro Optical Components)(What is a Light Emitting)Diode?) (Organic Solar Cells)

11. Basic methods and principles for materials characterization: Optical spectroscopy (X-ray, UV-visible, IR, Raman), Electron spectroscopy, Magnetic resonance spectroscopy (NMR, ESR).

12. Refraction, reflection, and transmission in loss-less dielectrics: index of refraction, Snell’s law, Brewster angle, total internal reflection, Frensel formulas for reflection and transmission. (Basics of Light )

13. Electric permittivity and susceptibility in dielectrics (Lorentz model) and in metals (Drude model). Classical and quantum approaches to absorption in materials.

14. Basics of laser materials: principles of operation (Lasers)

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