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**EP 311 PHYSICS OF SEMICONDUCTOR DEVICES**

Prof. Dr. Beşire Gönül

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**Contents Atoms and bonding 2. Energy bands and effective mass**

The periodic table Ionic bonding Covalent bonding Metallic bonding Van der Waals bonding 2. Energy bands and effective mass Semiconductors, insulators and metals Semiconductors Insulators Metals The concept of effective mass

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**3. Carrier concentration in semiconductors**

Donors and Acceptors Fermi level , Ef Carrier concentration equations Donors and acceptors both present 4. Conduction in semiconductors Carrier drift Carrier mobility Saturated drift velocity Mobility variation with temperature A derivation of Ohm’s law Drift current equations Semiconductor band diagrams with an electric field present Carrier diffusion The flux equation The Einstein relation Total current density Carrier recombination and diffusion length

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**6. LED, photodetectors and solar cell**

5. p-n junction The p-n junction in thermal equilibrium p-n junction barrier height Depletion approximation, electric field and potential One-sided, abrupt p-n junction Applying bias to the p-n junction Qualitative explanation of forward bias The ideal diode equation Reverse breakdown Depletion capacitance 6. LED, photodetectors and solar cell The light emitting diode Materials for LEDs Materials for visible wavelength LEDs Junction photodetectors Photoconductor Photoconductive gain analysis Solar cell

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**Core Book; Introductory Semiconductor Device Physics by Greg PARKER**

OBJECTIVES At the end of the semester, students should: - be able to discuss the alternative bonding mechanisms which constitute the solids. - get a knowledge of energy band diagrams and effective masses. - give an understanding of current carriers of electrons and holes in semiconductors. - be able to calculate the number density of current carriers. - calculate the currents flowing in real devices. - have a deep understanding of the physics and operation of p-n junction diodes. - get a knowledge of the physics of p-n junction devices.

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ELECTRICAL CONDUCTIVITY

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