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Debdeep Jena, EE 698D Advanced Semiconductor Physics EE 698D Fall 2004 SUMMARY
Debdeep Jena, EE 698D Topics Covered Semiconductor Bandstructure & Effective Mass Approximation Phonons/Lattice Vibrations Electronic Transport Optical Properties Quantum Confined Structures & Device Applications
Debdeep Jena, EE 698D Semiconductor Bandstructure Silicon GaAs GaN
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
Debdeep Jena, EE 698D Bandstructure – more accurate methods Empirical Pseudopotential Method LCAO methods SiliconGaAs
Debdeep Jena, EE 698D Phonons / Lattice Vibrations Phonon Dispersion of a typical semiconductor
Debdeep Jena, EE 698D Transport – Depends on Bandstructure, Phonons, Defects Example : GaN
Debdeep Jena, EE 698D Transport – Scattering and Velocity – field curves Low-field: Mobility High field – Velocity Saturation, Optical Phonon emission
Debdeep Jena, EE 698D Table of Scattering Processes
Debdeep Jena, EE 698D Theoretical Formalism
Debdeep Jena, EE 698D Theoretical Formalism – Contd…
Debdeep Jena, EE 698D Theoretical Formalism – Contd…
Debdeep Jena, EE 698D Theoretical Formalism – Contd… FERMI’S GOLDEN RULE
Debdeep Jena, EE 698D Transport in a Silicon MOSFET Electron Distribution in k-spaceElectron Distribution in Real-Space
Debdeep Jena, EE 698D Ballistic Transport – Electrons as waves Electrons flow and “diffract” like Waves on surface of water…
Debdeep Jena, EE 698D Optical Properties
Debdeep Jena, EE 698D Light in periodic structures… Photonic Bandgap Crystals
Debdeep Jena, EE 698D Bandgaps for light…
Debdeep Jena, EE 698D Quantum Confined Structures
Debdeep Jena, EE 698D Quantum Confined Structures Epitaxial 0-D (Quantum Dots) Nanotubes – 1D (Quantum Wires) Nanowire SuperlatticesNanowire “Combs”
Debdeep Jena, EE 698D Bulk Semiconductor – Device Applications The First Transistor (1947) Today’s MOSFET Today’s HBT
Debdeep Jena, EE 698D Quantum – Well Devices High-electron Mobility Transistors (HEMTs) GaN HEMTs GaAs Laser Diodes
Debdeep Jena, EE 698D Quantum Well Devices – GaN Solid State Lighting Blu-Ray DVD (GaN QW Laser) White LEDs - The New Bulbs!
Debdeep Jena, EE 698D Superlattices – Device Applications Quantum Cascade Lasers
Debdeep Jena, EE 698D Quantum Well Devices : Organic Semiconductors Flexible Displays (Based on optical transitions in organic QW- structures)
Debdeep Jena, EE 698D Quantum Wire Device Applications Nanowire Laser ArraysNanotube FETs
Debdeep Jena, EE 698D Quantum Dot Applications Nanocrystal (Quantum-Dot) Luminescence Spectra Quantum confinement changes emission wavelengths!
Debdeep Jena, EE 698D Quantum Dot Applications Stained Glass – Uses quantum-dot dispersion In Glass (19 th -century)! Today’s Nanocrystals Bio-Applications
Debdeep Jena, EE 698D And Finally… The NEW Christmas Lights! Hope you take away from this class the Excitement of this field …
Review of Semiconductor Physics Energy bands Bonding types – classroom discussion The bond picture vs. the band picture Bonding and antibonding Conduction.
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Importance of Materials Processing All electronic devices & systems are made of materials in various combinations Raw materials are far from the final.
A Digression: The Vast Field of Electrical Engineering But, each small field can consume one’s entire life So, how can one be a good device engineer???
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Heterostructures & Optoelectronic Devices Light generation in semiconductor n Light emission diode (LED) n Semiconductor laser n Heterojunction transistors.
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P n Excess holes Excess electrons. Fermi Level n-type p-type Holes.
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Temperature behaviour of threshold on broad area Quantum Dot-in-a-Well laser diodes By: Bhavin Bijlani.
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1 Review Problem allowed modes B Region of possible oscillations a)Find the photon lifetime of the passive cavity; that is, with 0 ( ) = 0. b)What is.
THE LIGHT EMITTING DIODE Chapter 6. CB VB When the electron falls down from conduction band and fills in a hole in valence band, there is an obvious loss.
Lecture 1 Periodicity and Spatial Confinement Crystal structure Translational symmetry Energy bands k·p theory and effective mass Theory of invariants.
Computational Solid State Physics 計算物性学特論 第９回 9. Transport properties I: Diffusive transport.
A PPROACHES /T OOLS : Theory of condensed matter and devices: Electronic structure, quantum and semiclassical transport, scattering and interactions, environmental.
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© Fraunhofer IAF Mechanisms of 1/f noise and Gain Instabilities in metamorphic HEMTS D. Bruch; M. Seelmann-Eggebert; S. Guha Fraunhofer Institute for Applied.
Specific Heat of Solids Quantum Size Effect on the Specific Heat Electrical and Thermal Conductivities of Solids Thermoelectricity Classical Size Effect.
Slide # 1 Luminescence basics Types of luminescence –Cathodoluminescence: Luminescence due to recombination of EHPs created by energetic electrons. Example:
Ultraviolet Photoelectron Spectroscopy (UPS) UV light ( h = 5 to 100 eV) to excite photoelectron. From an analysis of the kinetic energy and angular distribution.
INTRODUCTION Characteristics of Thermal Radiation Thermal Radiation Spectrum Two Points of View Two Distinctive Modes of Radiation Physical Mechanism of.
Shaping the color Optical property of photonic crystals Shine.
Ballistic and quantum transports in carbon nanotubes.
The Quasi-Free Electron and Electron Effective Mass, m * ECE G201 (Partly adapted from Prof. Hopwood)
Some examples of recent hot topics in Some examples of recent hot topics in Solid State Materials Solid State Materials 1)CNT & Graphene 2) Quantum dots.
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Advanced Drift Diffusion Device Simulator for 6H and 4H-SiC MOSFETs.
The effective mass Conductivity effective mass – determines mobility. Density of states effective mass – determines N C Cyclotron effective mass – can.
Conductivity Semiconductors & Metals Chemistry 754 Solid State Chemistry Lecture #20 May 14, 2003.
II. Basic Concepts of Semiconductor OE Devices Semiconductors –energy-band, bandgap energy, lattice constant –element & compound semiconductor –intrinsic.
6. Optoelectronic Devices. Optical Waveguides (a) A buried-in rectangular waveguide, (b) a buried-in rib waveguide, (c) a strip-loaded waveguide, and.
Optical properties and carrier dynamics of self-assembled GaN/AlGaN quantum dots Ashida lab. Nawaki Yohei Nanotechnology 17 (2006)
4.12 Modification of Bandstructure: Alloys and Heterostructures Since essentially all the electronic and optical properties of semiconductor devices are.
Advanced LED structures, materials, fabrication, lighting and other applications BY: GARETT HENRIKSEN 5/4/2015.
Nanostructures Research Group Center for Solid State Electronics Research Quantum corrected full-band Cellular Monte Carlo simulation of AlGaN/GaN HEMTs.
Nanoscale Optics and Photonics Xiaodong Yang, October 25, 2011 The iridescence of Morpho butterfly Photonic crystals Surface plasmons Metamaterials Reference.
SYNTHESIS AND ASSEMBLY. Size – Dependent Properties.
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Chapter 1 Introduction 1.1 Classification of optical processes Reflection Propagation Transmission Optical medium refractive index n( ) = c / v ( )
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