Presentation on theme: "EP 311 PHYSICS OF SEMICONDUCTOR DEVICES"— Presentation transcript:
1 EP 311 PHYSICS OF SEMICONDUCTOR DEVICES Prof. Dr. Beşire Gönül
2 Contents Atoms and bonding 2. Energy bands and effective mass The periodic tableIonic bondingCovalent bondingMetallic bondingVan der Waals bonding2. Energy bands and effective massSemiconductors, insulators and metalsSemiconductorsInsulatorsMetalsThe concept of effective mass
3 3. Carrier concentration in semiconductors Donors and AcceptorsFermi level , EfCarrier concentration equationsDonors and acceptors both present4. Conduction in semiconductorsCarrier driftCarrier mobilitySaturated drift velocityMobility variation with temperatureA derivation of Ohm’s lawDrift current equationsSemiconductor band diagrams with an electric field presentCarrier diffusionThe flux equationThe Einstein relationTotal current densityCarrier recombination and diffusion length
4 6. LED, photodetectors and solar cell 5. p-n junctionThe p-n junction in thermal equilibriump-n junction barrier heightDepletion approximation, electric field and potentialOne-sided, abrupt p-n junctionApplying bias to the p-n junctionQualitative explanation of forward biasThe ideal diode equationReverse breakdownDepletion capacitance6. LED, photodetectors and solar cellThe light emitting diodeMaterials for LEDsMaterials for visible wavelength LEDsJunction photodetectorsPhotoconductorPhotoconductive gain analysisSolar cell
5 Core Book; Introductory Semiconductor Device Physics by Greg PARKER OBJECTIVESAt 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.