Structure and Electrical Properties of Materials
|Class Hours - Lab Hours||3 - 1|
|Lecturers||Evangelos Hristoforou, Konstantinos Politopoulos, Dimitrios Karaoulanis (T & R Associates), Ioannis Panagodimos (T & R Associates), Nikolaos Voudoukis (T & R Associates)|
|Links||Helios, Course's Website|
Class 2: —
The Bohr atomic model, distribution of electrons of an atom in the layers-sublayers, quantum numbers, Periodic Table of chemical elements, valence electrons, chemical bonds. The data of the 14th Group.
The creation of energy zones/bands, the classification of materials according to their energy gap.
Crystal structures. Ideal, real. Crystal defects. Diamond crystal structure. The effects of crystal defects on the potential energy graphs (energy gap levels, surface energy levels). Crystal growth methods for applications in microelectronics (Czochralski, Zone refining, MBE).
Distribution functions. Fermi-Dirac statistics. Concentration, mobility of charge carriers, scattering, and effective mass of electrons-holes. Conductivity of metals and alloys. Phase diagrams. Conductivity in semiconductors.
Classical and quantum mechanical transport phenomena: Drift - diffusion and tunneling phenomena – thermionic emission. Superconductivity.
Interaction of light and semiconductors. Photon absorption and reconnection. Radiant and non-radiant reconnection (between Auger-type bands, and deep electronic states). Application: the photovoltaic phenomenon.
Semiconductor metal contact (Schottky diode, ohmic contacts). Structure and principles of operation of basic electronic solid state devices (p-n diode, bipolar transistor, MOS capacitor).