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Advanced Semiconductor PhysicsEE 698D Fall 2004 SUMMARY
Topics Covered Semiconductor Bandstructure & Effective Mass Approximation Phonons/Lattice Vibrations Electronic Transport Optical Properties Quantum Confined Structures & Device Applications
Semiconductor BandstructureSilicon GaAs GaN
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
Bandstructure – more accurate methodsEmpirical Pseudopotential Method LCAO methods Silicon GaAs
Phonons / Lattice VibrationsPhonon Dispersion of a typical semiconductor
Transport – Depends on Bandstructure, Phonons, DefectsExample : GaN
Transport – Scattering and Velocity – field curvesLow-field: Mobility High field – Velocity Saturation, Optical Phonon emission
Table of Scattering Processes
Theoretical Formalism – Contd…
Theoretical Formalism – Contd…
Theoretical Formalism – Contd…FERMI’S GOLDEN RULE
Transport in a Silicon MOSFETElectron Distribution in k-space Electron Distribution in Real-Space
Ballistic Transport – Electrons as wavesElectrons flow and “diffract” like Waves on surface of water…
Light in periodic structures…Photonic Bandgap Crystals
Bandgaps for light…
Quantum Confined Structures
Quantum Confined StructuresNanotubes – 1D (Quantum Wires) Epitaxial 0-D (Quantum Dots) Nanowire Superlattices Nanowire “Combs”
Bulk Semiconductor – Device ApplicationsToday’s HBT The First Transistor (1947) Today’s MOSFET
Quantum – Well Devices GaN HEMTs High-electron Mobility TransistorsGaAs Laser Diodes
Quantum Well Devices – GaN Solid State LightingBlu-Ray DVD (GaN QW Laser) White LEDs - The New Bulbs!
Superlattices – Device ApplicationsQuantum Cascade Lasers
(Based on optical transitions in organic QW- structures)Quantum Well Devices : Organic Semiconductors Flexible Displays (Based on optical transitions in organic QW- structures)
Quantum Wire Device ApplicationsNanowire Laser Arrays Nanotube FETs
Quantum Dot ApplicationsNanocrystal (Quantum-Dot) Luminescence Spectra Quantum confinement changes emission wavelengths!
Uses quantum-dot dispersionQuantum Dot Applications Today’s Nanocrystals Bio-Applications Stained Glass – Uses quantum-dot dispersion In Glass (19th-century)!
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.
Prof. Juejun (JJ) Hu MSEG 667 Nanophotonics: Materials and Devices 9: Absorption & Emission Processes Prof. Juejun (JJ) Hu
Advanced Semiconductor Physics ~ Dr. Jena University of Notre Dame Department of Electrical Engineering SIZE DEPENDENT TRANSPORT IN DOPED NANOWIRES Qin.
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???
9. Semiconductors Optics Absorption and gain in semiconductors Principle of semiconductor lasers (diode lasers) Low dimensional materials: Quantum wells,
Heterostructures & Optoelectronic Devices
Semiconducting Light- Emitting Devices James A. Johnson 16 December 2006.
P n Excess holes Excess electrons. Fermi Level n-type p-type Holes.
Dr. Nasim Zafar Electronics 1 EEE 231 – BS Electrical Engineering Fall Semester – 2012 COMSATS Institute of Information Technology Virtual campus Islamabad.
Thermoelectricity of Semiconductors
Temperature behaviour of threshold on broad area Quantum Dot-in-a-Well laser diodes By: Bhavin Bijlani.
Nanostructures with quantum wells and quantum dots Prof. Dr. Alexander L. Gurskii B.I.Stepanov Institute of Physics, National Academy of Sciences of Belarus.
Region of possible oscillations
THE LIGHT EMITTING DIODE
Lecture 1 Periodicity and Spatial Confinement Crystal structure Translational symmetry Energy bands k·p theory and effective mass Theory of.
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.
JFETs, MESFETs, and MODFETs
Semiconductor quantum well
© 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.
Luminescence basics Types of luminescence
Ultraviolet Photoelectron Spectroscopy (UPS)
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.
C19cof01 Optical Properties Refraction & Dispersion.
Single Quantum Dot Optical Spectroscopy
Advanced Drift Diffusion Device Simulator for 6H and 4H-SiC MOSFETs
The effective mass Conductivity effective mass – determines mobility.
Conductivity Semiconductors & Metals Chemistry 754 Solid State Chemistry Lecture #20 May 14, 2003.
II. Basic Concepts of Semiconductor OE Devices
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.
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
SYNTHESIS AND ASSEMBLY. Size – Dependent Properties.
Applications of Quantum Physics
Slide # 1 PL spectra of Quantum Wells The e1-h1 transition is most probable and observed with highest intensity At higher temperature higher levels can.
Chapter 1 Introduction 1.1 Classification of optical processes Reflection Propagation Transmission Optical medium refractive index n( ) = c / v ( )
Charge Carrier Related Nonlinearities
Introduction to Optical Properties BW, Chs 10 & 11; YC, Chs 6-8; S, Chs
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