NEMO5 Tutorial 6A: Device Simulation - Transport (Double Gate)
Online Presentations | 18 Jul 2012 | Contributor(s): Mehdi Salmani Jelodar, Seung Hyun Park, Zhengping Jiang, Tillmann Christoph Kubis, Michael Povolotskyi, Gerhard Klimeck
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Nanoelectronic Modeling Lecture 14: Open 1D Systems - Formation of Bandstructure
Online Presentations | 27 Jan 2010 | Contributor(s): Gerhard Klimeck, Dragica Vasileska
The infinite periodic structure Kroenig Penney model is often used to introduce students to the concept of bandstructure formation. It is analytically solvable for linear potentials and shows critical elements of bandstructure formation such as core bands and different effective masses in...
Nanoelectronic Modeling Lecture 33: Alloy Disorder in Bulk
Online Presentations | 04 Aug 2010 | Contributor(s): Gerhard Klimeck, Timothy Boykin, Chris Bowen
This presentation discusses disorder in AlGaAs unstrained systems in bulk. Bandstructure of an ideal simple unit cellWhat happens when there is disorder?Concept of a supercellBand folding in a supercellBand extraction from the concept of approximate bandstructureComparison of alloy disorder with...
Nanoelectronic Modeling: Exercises 1-3 - Barrier Structures, RTDs, and Quantum Dots
Online Presentations | 27 Jan 2010 | Contributor(s): Gerhard Klimeck
Exercises:Barrier StructuresUses: Piece-Wise Constant Potential Barrier ToolResonant Tunneling DiodesUses: Resonant Tunneling Diode Simulation with NEGF • Hartree calculation • Thomas Fermi potentialQuantum DotsUses: Quantum Dot Lab • pyramidal dot
Nanoelectronic Modeling Lecture 22: NEMO1D - Motivation, History and Key Insights
Online Presentations | 07 Feb 2010 | Contributor(s): Gerhard Klimeck
The primary objective of the NEMO-1D tool was the quantitative modeling of high performance Resonant Tunneling Diodes (RTDs). The software tool was intended for Engineers (concepts, fast turn-around, interactive) and Scientists (detailed device anaysis). Therefore various degrees of...
Nanoelectronic Modeling Lecture 04: nanoHUB.org - Impact on Education
Online Presentations | 25 Jan 2010 | Contributor(s): Gerhard Klimeck
This presentation will provide a few highlights of how nanoHUB.org is being used in education and what kind of impact it has had so far. Tools and seminars are indeed being used as instructional materials. nanoHUB has been used in over 290 classes in the past few years in over 90 institutions for...
Nanoelectronic Modeling Lecture 05: nanoHUB.org - Impact on Research
Impact on research is often measured by the number of publications in the scientific literature. The nanoHUB support team has identified 430 citations to nanoHUB.org and/or nanoHUB tools and seminars in the time frame leading up to May 2008 the 430 citations in the scientific literature. 52% of...
Nanoelectronic Modeling Lecture 26: NEMO1D -
Online Presentations | 09 Mar 2010 | Contributor(s): Gerhard Klimeck
NEMO1D demonstrated the first industrial strength implementation of NEGF into a simulator that quantitatively simulated resonant tunneling diodes. The development of efficient algorithms that simulate scattering from polar optical phonons, acoustic phonons, alloy disorder, and interface roughness...
Parallel Computing for Realistic Nanoelectronic Simulations
4.5 out of 5 stars
Online Presentations | 12 Sep 2005 | Contributor(s): Gerhard Klimeck
Typical modeling and simulation efforts directed towards the understanding of electron transport at the nanometer scale utilize single workstations as computational engines. Growing understanding of the involved physics and the need to model realistically extended devices increases the complexity...
Nanoelectronic Modeling Lecture 24: NEMO1D - Incoherent Scattering
0.0 out of 5 stars
Online Presentations | 02 Mar 2010 | Contributor(s): Gerhard Klimeck
Incoherent processes due to phonons, interface roughness and disorder had been suspected to be the primary source of the valley current of resonant tunneling diodes (RTDs) at the beginning of the NEMO1D project in 1994. The modeling tool NEMO was created at Texas Instruments to fundamentally...
Nanoelectronic Modeling Lecture 16: Introduction to RTDs - Realistic Doping Profiles
Realistic RTDs need extremely high doping to provide enough carriers for high current densities. However, Impurity scattering can destroy the RTD performance. The dopants are therefore typically spaced 20-100nm away from the central double barrier structure.
NanoElectronic MOdeling: NEMO
Online Presentations | 20 Dec 2007 | Contributor(s): Gerhard Klimeck
This presentation was one of 13 presentations in the one-day forum, "Excellence in Computer Simulation," which brought together a broad set of experts to reflect on the future of computational science and engineering.Novel nanoelectronic devices such as quantum dots, nanowires, and ultra-scaled...
Nanoelectronic Modeling Lecture 32: Strain Layer Design through Quantum Dot TCAD
Online Presentations | 04 Aug 2010 | Contributor(s): Gerhard Klimeck, Muhammad Usman
This presentation demonstrates the utilization of NEMO3D to understand complex experimental data of embedded InAs quantum dots that are selectively overgrown with a strain reducing InGaAs layer. Different alloy concentrations of the strain layer tune the optical emission and absorption wavelength...
nanoHUB in a Nutshell: Delivering New Paradigms in Education and Research
Online Presentations | 09 Jul 2018 | Contributor(s): Gerhard Klimeck
Gordon Moore’s 1965 prediction of continued semiconductor device down-scaling and circuit up-scaling has become a self-fulfilling prophesy in the past 50 years. Open source code development and sharing of the process modeling software SUPREM and the circuit modeling software SPICE were two...
Nanoelectronic Modeling Lecture 25b: NEMO1D - Hole Bandstructure in Quantum Wells and Hole Transport in RTDs
Heterostructures such as resonant tunneling diodes, quantum well photodetectors and lasers, and cascade lasers break the symmetry of the crystalline lattice. Such break in lattice symmetry causes a strong interaction of heavy-, light- and split-off hole bands. The bandstructure of holes and the...
Tutorial 4c: Formation of Bandstructure in Finite Superlattices (Exercise Session)
Online Presentations | 29 Mar 2011 | Contributor(s): Gerhard Klimeck
How does bandstructure occur? How large does a repeated system have to be? How does a finite superlattice compare to an infinite superlattice?
Nanoelectronic Modeling Lecture 23: NEMO1D - Importance of New Boundary Conditions
One of the key insights gained during the NEMO1D project was the development of new boundary conditions that enabled the modeling of realistically extended Resonant Tunneling Diodes (RTDs). The new boundary conditions are based on the partitioning of the device into emitter and collector...
Nanoelectronic Modeling Lecture 29: Introduction to the NEMO3D Tool
Online Presentations | 04 Aug 2010 | Contributor(s): Gerhard Klimeck
This presentation provides a very high level software overview of NEMO3D. The items discussed are:Modeling Agenda and MotivationTight-Binding Motivation and basic formula expressionsTight binding representation of strainSoftware structureNEMO3D algorithm flow NEMO3D parallelization scheme –...
Nanoelectronic Modeling Lecture 18: Introduction to RTDs - Quantum Charge Self-Consistency (Hartree)
In this semi-classical charge and potential model the quantum mechanical simulation is performed once and the quantum mechanical charge is in general not identical to the semi-classical charge.
Nanoelectronic Modeling Lecture 35: Alloy Disorder in Nanowires
Online Presentations | 05 Aug 2010 | Contributor(s): Gerhard Klimeck, Timothy Boykin, Neerav Kharche, Mathieu Luisier, Neophytos Neophytou
This presentation discusses the consequences of Alloy Disorder in unstrained strained AlGaAs nanowiresRelationship between dispersion relationship and transmission in perfectly ordered wiresBand folding in Si nanowiresTranmisison in disordered wires – relationship to an approximate...
Nanoelectronic Modeling Lecture 19: Introduction to RTDs - Asymmetric Structures
This lecture explores this effect in more detail by targeting an RTD that has a deliberate asymmetric structure. The collector barrier is chosen thicker than the emitter barrier. With this set-up we expect that the tunneling rate into the RTD from the emitter is faster than the tunneling rate...
Nanoelectronic Modeling Lecture 17: Introduction to RTDs - Relaxation Scattering in the Emitter
Realistic RTDs will have nonlinear electrostatic potential in their emitter. Typically a triangular well is formed in the emitter due to the applied bias and the emitter thus contains discrete quasi bound states.
Nanoelectronic Modeling Lecture 25a: NEMO1D - Full Bandstructure Effects
Online Presentations | 07 Jul 2010 | Contributor(s): Gerhard Klimeck
(quantitative RTD modeling at room temperature)
Ensemble Monte Carlo Method Described
5.0 out of 5 stars
Online Presentations | 27 Apr 2008 | Contributor(s): Dragica Vasileska, Gerhard Klimeck, Mark Lundstrom, David K. Ferry
In this presentation we give an overview of the implementation details of the Ensemble Monte Carlo method for mobility and drift velocity calculation in arbitrary materials and arbitrary crystalographic orientations.NSF-Career, ONR
Nanoelectronic Modeling Lecture 34: Alloy Disorder in Quantum Dots
Online Presentations | 07 Jul 2010 | Contributor(s): Gerhard Klimeck, Timothy Boykin, Chris Bowen
This presentation discusses the consequences of Alloy Disorder in strained InGaAs Quantum Dots Reminder of the origin of bandstructure and bandstructure engineeringWhat happens when there is disorder?Concept of disorder in the local bandstructureConfiguration noise, concentration noise,...