Threshold voltage in a nanowire MOSFET

22 Apr 2010 | Animations | Contributor(s): Saumitra Raj Mehrotra, SungGeun Kim, Gerhard Klimeck

Threshold voltage in a metal oxide semiconductor field-effect transistor (better known as a MOSFET) is usually defined as the gate voltage at which an inversion layer forms at the interface between the insulating layer (oxide) and the substrate (body) of the transistor. A MOSFET is said to be...

Resonant Tunneling Diode operation

22 Apr 2010 | Animations | Contributor(s): Saumitra Raj Mehrotra, Gerhard Klimeck

A resonant tunneling diode (RTD) is a type of diode with a resonant tunneling structure that allows electrons to tunnel through various resonant states at certain energy levels. RTDs can be fabricated using many different types of materials (such as III-V, type IV, II-VI semiconductors) and...

CV profile with different oxide thickness

20 Apr 2010 | Animations | Contributor(s): Saumitra Raj Mehrotra, Gerhard Klimeck

C-V (or capacitance-voltage) profiling refers to a technique used for the characterization of semiconductor materials and devices. C-V testing is often used during the characterization process to determine semiconductor parameters, particularly in MOSCAP and MOSFET structures.C-V measurements can...

Fermi-Dirac statistics with temperature

15 Apr 2010 | Animations | Contributor(s): Saumitra Raj Mehrotra, Gerhard Klimeck

Fermi-Dirac statistics is applied to identical particles with half-integer spin (such as electrons) in a system that is in thermal equilibrium. Since particles are assumed to have negligible mutual interactions, this allows a multi-particle system to be described in terms of single-particle...

Diffusion of holes and electrons

15 Apr 2010 | Animations | Contributor(s): Saumitra Raj Mehrotra, Gerhard Klimeck

Diffusion is a process of particles distributing themselves from regions of high- to low- concentrations. In semi-classical electronics these particles are the charge carriers (electrons and holes). The rate at which a carrier can diffuse is called diffusion constant with units of cm2/s. The...

Graphite

17 Apr 2010 | Animations | Contributor(s): Saumitra Raj Mehrotra, Gerhard Klimeck

Graphene is a one-atom-thick planar sheet of sp2-bonded carbon atoms that are densely packed in a honeycomb crystal lattice. Graphene sheets are weakly bonded to other graphene layers above and below to form Graphite. The difference between two layers is approximately 0.335 nm [1].Graphite can...

Center of Excellence on Novel Materials (CENM) Overview Video

11 Oct 2010 | Animations | Contributor(s): Pedro Antonio Prieto

The CENTER OF EXCELLENCE FOR NOVEL MATERIALS (CENM) is part of a high-priority national effort supported primarily by COLCIENCIAS and integrated by 19 recognized multidisciplinary research groups from 10 universities across Columbia.

Quantum-dot Cellular Automata (QCA) - Logic Gates

03 Feb 2006 | Animations | Contributor(s): John C. Bean

An earlier animation described how "Quantum-dot Cellular Automata" (QCAs) could serve as memory cells and wires. This animation contnues the story by describing how QCAs can be made into MAJORITY, OR, AND, and INVERTER logic gates.

Local density of states

09 Apr 2010 | Animations | Contributor(s): Saumitra Raj Mehrotra, Gerhard Klimeck

The concept of general density of states (DOS) in devices is, by definition, spatially invariant. However, in the case of inhomogeneous materials or in quantum confined structures, the density of states can be resolved in space. This is known as local density of states, or LDOS. …

Quantum-dot Cellular Automata (QCA) - Memory Cells

03 Feb 2006 | Animations | Contributor(s): John C. Bean

Scientists and engineers are looking for completely different ways of storing and analyzing information. Quantum-dot Cellular Automata are one possible solution. In computers of the future, transistors may be replaced by assemblies of quantum dots called Quantum-dot Cellular Automata (QCAs).This...

Tunneling in an Nanometer-Scaled Transistor

25 Jan 2011 | Animations | Contributor(s): Gerhard Klimeck, Mathieu Luisier, Neerav Kharche, George A. Howlett, Insoo Woo, David Ebert

Electrons tunneling through the gate of an ultra-scaled transistor.

Carrier Statistics Lab Video Demonstration

21 Sep 2010 | Animations | Contributor(s): Saumitra Raj Mehrotra

This video shows: Basic input deck for the tool,Simulation run of Temperature sweep with constant fermi level, Simulation run of Temperature sweep with constant doping.

Quantum Dot Wave Function (Quantum Dot Lab)

02 Feb 2011 | Animations | Contributor(s): Gerhard Klimeck, David S. Ebert, Wei Qiao

Electron density of an artificial atom. The animation sequence shows various electronic states in an Indium Arsenide (InAs)/Gallium Arsenide (GaAs) self-assembled quantum dot.

Crystal Viewer Tool Video Demonstration

30 Nov 2010 | Animations | Contributor(s): Saumitra Raj Mehrotra, Lynn Zentner, Joseph M. Cychosz

This video shows the use of the Crystal Viewer Tool to visualize several material/crystal systems. The examples demonstrated will provide a first-time user with a basic understanding of how the tool works.

Carbon nanotube bandstructure

09 Apr 2010 | Animations | Contributor(s): Saumitra Raj Mehrotra, Gerhard Klimeck

Carbon nanotubes are allotropes of carbon with a cylindrical nanostructure, and can be categorized into single-walled nanotubes (SWNT) and multi-walled nanotubes (MWNT). These cylindrical carbon molecules have novel properties that make them potentially useful in many nanotechnology applications,...

Quantum Dot Lab Demonstration: Pyramidal Qdots

03 Jun 2009 | Animations | Contributor(s): Gerhard Klimeck, Benjamin P Haley

This video shows the simulation and analysis of a pyramid-shaped quantum dot using Quantum Dot Lab. Several powerful analytic features of this tool are demonstrated.

OMEN Nanowire Demonstration: Nanowire Simulation and Analysis

03 Jun 2009 | Animations | Contributor(s): Gerhard Klimeck, Benjamin P Haley

This video shows the simulation and analysis of a nanowire using OMEN Nanowire. Several powerful analytic features of this tool are demonstrated.

Particle-Wave Duality: an Animation

07 Jul 2008 | Animations

This animation is publicly available at YouTube under http://www.youtube.com/watch?v=DfPeprQ7oGc

General Introduction to Nanotechnology

20 Apr 2007 | Animations | Contributor(s): Hyung-Seok Hahm

This is an 80 second movie clip. The camera zooms in from a computer to molecules with a narration.The design goals are - Give a smooth introduction to nano-world- Deliver ideas of how small nano-scale objects are with a zoom-in- Inform that nanotechnology is related to everyday thingsProduced by...

Molecular Beam Epitaxy

16 Nov 2005 | Animations | Contributor(s): John C. Bean

Microelectronic devices are made by repeating two steps: 1) Depositing a thin uniform layer of material; 2) Then using a photographic process to pattern and remove unwanted areas of that layer.