Application of nanoHUB Tools in the Classroom

Dragica VasileskaArizona State University

vasileska@asu.edu

172 countries172 countries

Users in Sept 2010

Gerhard Klimeck

Outline

Overview of Tool Usage

Selected Tools Within ABACUS

Selected Tools Within AQME

Gerhard Klimeck

Network for Computational Nanotechnology (NCN)Purdue, Norfolk State, Northwestern, MIT, Molecular Foundry, UC Berkeley, Univ. of Illinois, UTEP

How to Use Tools?

Crystal Viewer

PN Junction

LabPCPBT

Gerhard Klimeck

Courses at ASU That Utilize nanoHUB.org

EEE352: Properties of

Electronic Materials

(D.K. Ferry) ABACUS

EEE434: Quantum

Mechanics for Engineers

(D. K. Ferry) AQME

EEE533: Semiconductor

Device and Process Modeling

(D. Vasileska) ABACUS

EEE598: Advanced Device

Simulation (D. Vasileska)

AQME + ABACUS

EEE598: Modeling

Optoelectronic Devices

(D. Vasileska)

Gerhard Klimeck

Network for Computational Nanotechnology (NCN)Purdue, Norfolk State, Northwestern, MIT, Molecular Foundry, UC Berkeley, Univ. of Illinois, UTEP

Selected Tools Within ABACUS

Used in EducationPN

Junction ModuleMOS

Capacitors Module

Gerhard Klimeck

Developed at Bell Laboratories

Allows Simulation of Silicon-Based

Devices

Input Deck Easy to Implement

Engine Behind The Tools Chosen from ABACUS

PADRE

PADRE (Pisces And Device REplacement) developed by Mark Pinto at AT&T Bell Labs.

Gerhard Klimeck

ABACUS: PN Junction Lab

PN Diode Tool

Equilibrium Conditions

Electric Field Profile

Total Charge Density

Non-Equilibrium Conditions

IV-Characteristics

4585 user(s), detailed usage1374 user(s) in 83 class(es)2 Citation(s)

Gerhard Klimeck

PN Junction Lab: Electric Field Profile

Gerhard Klimeck

PN Junction Lab: Total Charge Density

Gerhard Klimeck

PN Junction Lab: IV Characteristics

Gerhard Klimeck

ABACUS: MOS Capacitors Tool

MOS Capacitors Tool:

•Inversion Charge Density•Low-Frequency and High Frequency CV Curves

2341 user(s), detailed usage583 user(s) in 33 class(es)2 Citation(s)

Gerhard Klimeck

MOSCap: Electron Density

Tox = 1 nmNA = 1017 cm-3

VG = 1 V

Tox = 1 nmNA = 1017 cm-3

VG = 0 V

Gerhard Klimeck

MOSCap: Capacitance

Gerhard Klimeck

Network for Computational Nanotechnology (NCN)Purdue, Norfolk State, Northwestern, MIT, Molecular Foundry, UC Berkeley, Univ. of Illinois, UTEP

Selected Tools Within AQME Used

in EducationBSC Lab

PCPBT

SCHRED

Gerhard Klimeck

AQME: BSC Lab

Type of Confinement Most Commonly Encountered in Practical Applications

The Form of the Wavefunctions

When Quantum Mechanics Approaches Classical Mechanics?

329 user(s), detailed usage32 user(s) in 4 class(es)

Gerhard Klimeck

BSC Lab: Confinement

Type of Confinement Most Commonly Encountered in Practical Applications

Gerhard Klimeck

BSC Lab: WavefunctionsThe Form of the Wavefunctions

Gerhard Klimeck

BSC Lab: Quantum and Classical Physics

When Quantum Mechanics Approaches Classical Mechanics?

Quantum Behavior Towards Classical Physics

Gerhard Klimeck

AQME + ABACUS: PCPBT

Symmetric vs. Asymmetric Double Barrier Structure

PCPBT

514 user(s), detailed usage30 user(s) in 6 class(es)

Gerhard Klimeck

PCPBT: Symmetric vs. Asymmetric Structure

Symmetric barriers Asymmetric barriers

Gerhard Klimeck

PCPBT: From 1 Well to 2 wells to 5 wells to Periodic Potentials

Gerhard Klimeck

AQME: Schred

When Quantum Effects Become

Important?Classical vs.

Quantum Mechanical

Charge Density

Degradation of the Total Gate Capacitance

Shift in the Threshold Voltage

Modeling of Strained Si Capacitors

Modeling of GaAs

Capacitors

1934 user(s), detailed usage263 user(s) in 31 class(es)104 Citation(s)

Gerhard Klimeck

Schred: When quantum effects become important?

NA=1016, 1017 and 1018 cm-3

Tox=1 nm

Degradation of totalgate capacitance

Shift in the thresholdvoltage

Schred as Teaching Tool

Gerhard Klimeck

Schred: Classical vs. quantum-mechanicalcharge density

NA = 1018 cm-3, Tox = 1 nm

Schred as Teaching Tool

Gerhard Klimeck

Schred: Degradation of the total gate capacitance

0.20.30.4

0.50.6

0.7

0.80.9

1

1 2 3 4 5 6 7 8 9 10

classical M-B, metal gatesclassical F-D, metal gatesquantum, metal gates

quantum, poly-gates ND=6x1019 cm-3

quantum, poly-gates ND=1020 cm-3

quantum, poly-gates ND=2x1020 cm-3

Cto

t/Cox

Oxide thickness tox

[nm]

T=300 K, NA=1018 cm-3

Schred as Research Tool

Gerhard Klimeck

Schred: Shift in the threshold voltage

0

100

200

300

400

500

1016 1017 1018

Van Dort experimental data for tox

=14 nm

Our simulation results for tox

=14 nm

Vth

[m

V]

NA [cm-3]

Schred as Research Tool

Gerhard Klimeck

Schred: Modeling of Strained Si Capacitors

Schred as Research Tool

Gerhard Klimeck

Schred: Modeling of GaAs Capacitors

Schred as Research Tool

Gerhard Klimeck

Conclusions

Tools on the nanoHUB are

useful for:

Teaching in the classroom for real-time

demonstrations

Homework assignments to

better understand

device physics concepts

Research