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Debdeep Jena, EE 698D Advanced Semiconductor Physics EE 698D Fall 2004 SUMMARY.

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Presentation on theme: "Debdeep Jena, EE 698D Advanced Semiconductor Physics EE 698D Fall 2004 SUMMARY."— Presentation transcript:

1 Debdeep Jena, EE 698D Advanced Semiconductor Physics EE 698D Fall 2004 SUMMARY

2 Debdeep Jena, EE 698D Topics Covered Semiconductor Bandstructure & Effective Mass Approximation Phonons/Lattice Vibrations Electronic Transport Optical Properties Quantum Confined Structures & Device Applications

3 Debdeep Jena, EE 698D Semiconductor Bandstructure Silicon GaAs GaN

4 Debdeep Jena, EE 698D Bandstructure – k.p Most of the action happens very close to the CB & VB edges k.p theory ideal to handle such cases From Notes

5 Debdeep Jena, EE 698D Bandstructure – more accurate methods Empirical Pseudopotential Method LCAO methods SiliconGaAs

6 Debdeep Jena, EE 698D Phonons / Lattice Vibrations Phonon Dispersion of a typical semiconductor

7 Debdeep Jena, EE 698D Transport – Depends on Bandstructure, Phonons, Defects Example : GaN

8 Debdeep Jena, EE 698D Transport – Scattering and Velocity – field curves Low-field: Mobility High field – Velocity Saturation, Optical Phonon emission

9 Debdeep Jena, EE 698D Table of Scattering Processes

10 Debdeep Jena, EE 698D Theoretical Formalism

11 Debdeep Jena, EE 698D Theoretical Formalism – Contd…

12 Debdeep Jena, EE 698D Theoretical Formalism – Contd…

13 Debdeep Jena, EE 698D Theoretical Formalism – Contd… FERMI’S GOLDEN RULE

14 Debdeep Jena, EE 698D Transport in a Silicon MOSFET Electron Distribution in k-spaceElectron Distribution in Real-Space

15 Debdeep Jena, EE 698D Ballistic Transport – Electrons as waves Electrons flow and “diffract” like Waves on surface of water…

16 Debdeep Jena, EE 698D Optical Properties

17 Debdeep Jena, EE 698D Light in periodic structures… Photonic Bandgap Crystals

18 Debdeep Jena, EE 698D Bandgaps for light…

19 Debdeep Jena, EE 698D Quantum Confined Structures

20 Debdeep Jena, EE 698D Quantum Confined Structures Epitaxial 0-D (Quantum Dots) Nanotubes – 1D (Quantum Wires) Nanowire SuperlatticesNanowire “Combs”

21 Debdeep Jena, EE 698D Bulk Semiconductor – Device Applications The First Transistor (1947) Today’s MOSFET Today’s HBT

22 Debdeep Jena, EE 698D Quantum – Well Devices High-electron Mobility Transistors (HEMTs) GaN HEMTs GaAs Laser Diodes

23 Debdeep Jena, EE 698D Quantum Well Devices – GaN Solid State Lighting Blu-Ray DVD (GaN QW Laser) White LEDs - The New Bulbs!

24 Debdeep Jena, EE 698D Superlattices – Device Applications Quantum Cascade Lasers

25 Debdeep Jena, EE 698D Quantum Well Devices : Organic Semiconductors Flexible Displays (Based on optical transitions in organic QW- structures)

26 Debdeep Jena, EE 698D Quantum Wire Device Applications Nanowire Laser ArraysNanotube FETs

27 Debdeep Jena, EE 698D Quantum Dot Applications Nanocrystal (Quantum-Dot) Luminescence Spectra Quantum confinement changes emission wavelengths!

28 Debdeep Jena, EE 698D Quantum Dot Applications Stained Glass – Uses quantum-dot dispersion In Glass (19 th -century)! Today’s Nanocrystals Bio-Applications

29 Debdeep Jena, EE 698D And Finally… The NEW Christmas Lights! Hope you take away from this class the Excitement of this field …


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