tutorial5: (real) device simulations – quantum dots
DESCRIPTION
Tutorial5: (real) Device Simulations – Quantum Dots. Jean Michel D. Sellier Yuling Hsueh , Hesameddin Ilatikhameneh , Tillmann Kubis, Michael Povolotskyi , Jim Fonseca, Gerhard Klimeck Network for Computational Nanotechnology (NCN) Electrical and Computer Engineering. …in this tutorial. - PowerPoint PPT PresentationTRANSCRIPT
![Page 1: Tutorial5: (real) Device Simulations – Quantum Dots](https://reader036.vdocuments.us/reader036/viewer/2022062521/56816938550346895de09d14/html5/thumbnails/1.jpg)
Tutorial5: (real) Device Simulations – Quantum Dots
Jean Michel D. SellierYuling Hsueh, Hesameddin Ilatikhameneh,Tillmann Kubis, Michael Povolotskyi, Jim
Fonseca, Gerhard KlimeckNetwork for Computational Nanotechnology (NCN)
Electrical and Computer Engineering
![Page 2: Tutorial5: (real) Device Simulations – Quantum Dots](https://reader036.vdocuments.us/reader036/viewer/2022062521/56816938550346895de09d14/html5/thumbnails/2.jpg)
…in this tutorial
In this tutorial
![Page 3: Tutorial5: (real) Device Simulations – Quantum Dots](https://reader036.vdocuments.us/reader036/viewer/2022062521/56816938550346895de09d14/html5/thumbnails/3.jpg)
…in this tutorial
• What is a Quantum Dot?
• What are QDs applications?
• Fabrication of Quantum Dots
• Strain
• Wavefunctions on a subdomain
• Tutorials
• What is a Quantum Dot?
![Page 4: Tutorial5: (real) Device Simulations – Quantum Dots](https://reader036.vdocuments.us/reader036/viewer/2022062521/56816938550346895de09d14/html5/thumbnails/4.jpg)
…in this tutorial
• What is a Quantum Dot?
• What are QDs applications?
• Fabrication of Quantum Dots
• Strain
• Wavefunctions on a subdomain
• Tutorials
• What is a Quantum Dot?
• What are QDs applications?
![Page 5: Tutorial5: (real) Device Simulations – Quantum Dots](https://reader036.vdocuments.us/reader036/viewer/2022062521/56816938550346895de09d14/html5/thumbnails/5.jpg)
…in this tutorial
• What is a Quantum Dot?
• What are QDs applications?
• Fabrication of Quantum Dots
• Strain
• Wavefunctions on a subdomain
• Tutorials
• What is a Quantum Dot?
• What are QDs applications?
• Fabrication of Quantum Dots
![Page 6: Tutorial5: (real) Device Simulations – Quantum Dots](https://reader036.vdocuments.us/reader036/viewer/2022062521/56816938550346895de09d14/html5/thumbnails/6.jpg)
…in this tutorial
• What is a Quantum Dot?
• What are QDs applications?
• Fabrication of Quantum Dots
• Strain
• Wavefunctions on a subdomain
• Tutorials
• What is a Quantum Dot?
• What are QDs applications?
• Fabrication of Quantum Dots
• Strain
![Page 7: Tutorial5: (real) Device Simulations – Quantum Dots](https://reader036.vdocuments.us/reader036/viewer/2022062521/56816938550346895de09d14/html5/thumbnails/7.jpg)
…in this tutorial
• What is a Quantum Dot?
• What are QDs applications?
• Fabrication of Quantum Dots
• Strain
• Wavefunctions on a subdomain
• Tutorials
• What is a Quantum Dot?
• What are QDs applications?
• Fabrication of Quantum Dots
• Strain
• Wavefunctions on a subdomain
![Page 8: Tutorial5: (real) Device Simulations – Quantum Dots](https://reader036.vdocuments.us/reader036/viewer/2022062521/56816938550346895de09d14/html5/thumbnails/8.jpg)
…in this tutorial
• What is a Quantum Dot?
• What are QDs applications?
• Fabrication of Quantum Dots
• Strain
• Wavefunctions on a subdomain
• Tutorials
• What is a Quantum Dot?
• What are QDs applications?
• Fabrication of Quantum Dots
• Strain
• Wavefunctions on a subdomain
• Tutorials
![Page 9: Tutorial5: (real) Device Simulations – Quantum Dots](https://reader036.vdocuments.us/reader036/viewer/2022062521/56816938550346895de09d14/html5/thumbnails/9.jpg)
What is a Quantum Dot?
What is a Quantum Dot?
![Page 10: Tutorial5: (real) Device Simulations – Quantum Dots](https://reader036.vdocuments.us/reader036/viewer/2022062521/56816938550346895de09d14/html5/thumbnails/10.jpg)
What is a Quantum Dot?
• A quantum dot is a very small portion of matter where carriers are confined.
• Their electric properties are somehow between a bulk semiconductor and a discrete set of molecules.
• They have been discovered for the first time by Alexei Ekimov and Louis E. Brus, independently, in 1980.
• A quantum dot is a very small portion of matter where carriers are confined.
[8] http://nanotechweb.org/cws/article/lab/46835
![Page 11: Tutorial5: (real) Device Simulations – Quantum Dots](https://reader036.vdocuments.us/reader036/viewer/2022062521/56816938550346895de09d14/html5/thumbnails/11.jpg)
What is a Quantum Dot?
• A quantum dot is a very small portion of matter where carriers are confined.
• Their electric properties are somehow between a bulk semiconductor and a discrete set of molecules.
• They have been discovered for the first time by Alexei Ekimov and Louis E. Brus, independently, in 1980.
• A quantum dot is a very small portion of matter where carriers are confined.
• Their electric properties are somehow between a bulk semiconductor and a discrete set of molecules.
[8] http://nanotechweb.org/cws/article/lab/46835
![Page 12: Tutorial5: (real) Device Simulations – Quantum Dots](https://reader036.vdocuments.us/reader036/viewer/2022062521/56816938550346895de09d14/html5/thumbnails/12.jpg)
What is a Quantum Dot?
• A quantum dot is a very small portion of matter where carriers are confined.
• Their electric properties are somehow between a bulk semiconductor and a discrete set of molecules.
• They have been discovered for the first time by Alexei Ekimov and Louis E. Brus, independently, in 1980.
• A quantum dot is a very small portion of matter where carriers are confined.
• Their electric properties are somehow between a bulk semiconductor and a discrete set of molecules.
• They have been discovered for the first time by Alexei Ekimov and Louis E. Brus, independently, in 1980.
[8] http://nanotechweb.org/cws/article/lab/46835
![Page 13: Tutorial5: (real) Device Simulations – Quantum Dots](https://reader036.vdocuments.us/reader036/viewer/2022062521/56816938550346895de09d14/html5/thumbnails/13.jpg)
What is a Quantum Dot?
• A quantum dot is a very small portion of matter where carriers are confined.
• Their electric properties are somehow between a bulk semiconductor and a discrete set of molecules.
• They have been discovered for the first time by Alexei Ekimov and Louis E. Brus, independently, in 1980.
• A quantum dot is a very small portion of matter where carriers are confined.
• Their electric properties are somehow between a bulk semiconductor and a discrete set of molecules.
• They have been discovered for the first time by Alexei Ekimov and Louis E. Brus, independently, in 1980.
[8] http://nanotechweb.org/cws/article/lab/46835
![Page 14: Tutorial5: (real) Device Simulations – Quantum Dots](https://reader036.vdocuments.us/reader036/viewer/2022062521/56816938550346895de09d14/html5/thumbnails/14.jpg)
What is a Quantum Dot?
• Quantum Dots (QDs) are (real) tiny object where :
characteristic becomes comparable to Bohr radius
atoms are countable
energy spectrum becomes discrete
density of states becomes sharp
• Quantum Dots (QDs) are (real) tiny object where :
characteristic becomes comparable to Bohr radius
![Page 15: Tutorial5: (real) Device Simulations – Quantum Dots](https://reader036.vdocuments.us/reader036/viewer/2022062521/56816938550346895de09d14/html5/thumbnails/15.jpg)
What is a Quantum Dot?
• Quantum Dots (QDs) are (real) tiny object where :
characteristic becomes comparable to Bohr radius
atoms are countable
energy spectrum becomes discrete
density of states becomes sharp
• Quantum Dots (QDs) are (real) tiny object where :
characteristic becomes comparable to Bohr radius
atoms are countable
![Page 16: Tutorial5: (real) Device Simulations – Quantum Dots](https://reader036.vdocuments.us/reader036/viewer/2022062521/56816938550346895de09d14/html5/thumbnails/16.jpg)
What is a Quantum Dot?
• Quantum Dots (QDs) are (real) tiny object where :
characteristic becomes comparable to Bohr radius
atoms are countable
energy spectrum becomes discrete
density of states becomes sharp
• Quantum Dots (QDs) are (real) tiny object where :
characteristic becomes comparable to Bohr radius
atoms are countable
energy spectrum becomes discrete
![Page 17: Tutorial5: (real) Device Simulations – Quantum Dots](https://reader036.vdocuments.us/reader036/viewer/2022062521/56816938550346895de09d14/html5/thumbnails/17.jpg)
What is a Quantum Dot?
• Quantum Dots (QDs) are (real) tiny object where :
characteristic becomes comparable to Bohr radius
atoms are countable
energy spectrum becomes discrete
density of states becomes sharp
• Quantum Dots (QDs) are (real) tiny object where :
characteristic becomes comparable to Bohr radius
atoms are countable
energy spectrum becomes discrete
density of states becomes sharp
![Page 18: Tutorial5: (real) Device Simulations – Quantum Dots](https://reader036.vdocuments.us/reader036/viewer/2022062521/56816938550346895de09d14/html5/thumbnails/18.jpg)
What is a Quantum Dot?
• Quantum Dots (QDs) are (real) tiny object where :
characteristic becomes comparable to Bohr radius
atoms are countable
energy spectrum becomes discrete
density of states becomes sharp
quantum effects are VERY pronounced!
• Quantum Dots (QDs) are (real) tiny object where :
characteristic becomes comparable to Bohr radius
atoms are countable
energy spectrum becomes discrete
density of states becomes sharp
quantum effects are VERY pronounced!
![Page 19: Tutorial5: (real) Device Simulations – Quantum Dots](https://reader036.vdocuments.us/reader036/viewer/2022062521/56816938550346895de09d14/html5/thumbnails/19.jpg)
Applications
Applications
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What are QDs applications?
• QDs are considered to be revolutionary nanoelectronics devices
next-generation lighting, lasers, quantum computing, information storage, quantum cryptography, biological labels, sensors, etc..
• QDs are considered to be revolutionary nanoelectronics devices
next-generation lighting, lasers, quantum computing, information storage, quantum cryptography, biological labels, sensors, etc..
[1] R. Maranganti, P. Sharma, “Handbook of Theoretical and Computational Nanotechnology”, American Scientific Publishers.[3] http://en.wikipedia.org/wiki/Quantum_dot
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Applications
• Magnified view of QDattachment to neurons.[1] R. Maranganti, P. Sharma,“Handbook of Theoretical and Computational Nanotechnology”,American Scientific Publishers.
• Tracking of living cells
[4] X. Michalet, et al., “Quantum Dots for Live Cells, in Vivo imaging, and Diagnostics”, NIH Public Press.
![Page 22: Tutorial5: (real) Device Simulations – Quantum Dots](https://reader036.vdocuments.us/reader036/viewer/2022062521/56816938550346895de09d14/html5/thumbnails/22.jpg)
Applications
• QD based transistor
[2] Martin Fuechsle, S. Mahapatra, F.A. Zwanenburg, Mark Friesen,M.A. Eriksson, Michelle Y. Simmons,“Spectroscopy of few-electron single-crystal silicon quantum dots”,NATURE NANOTECHNOLOGY LETTER.
![Page 23: Tutorial5: (real) Device Simulations – Quantum Dots](https://reader036.vdocuments.us/reader036/viewer/2022062521/56816938550346895de09d14/html5/thumbnails/23.jpg)
Fabrication
Fabrication
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Fabrication of QDs
• Strained QDs are:
small regions of materials buried in a larger band gap material
Stranski-Krastanov growth technique
[9] http://www.kprc.se/Framed/mainWindow.php?id=Doc/QDots.html
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Fabrication of QDs
• Electrostatically confined QDs are:
small regions of materials buried in a larger band gap material
built by etching technique
[10] M. Reed, “Quantum Dots”, Scientific American, January 1993.
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QDs simulations
Simulation of Quantum Dots
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The structure
Simplified
[5] M. Usman et al., “Moving Toward Nano-TCAD Through Multimillion-Atom Quantum-Dot Simulations Matching Experimental Data”,IEEE Transactions on Nanotechnology, Vol. 8, No. 3, May 2009.
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Models
• What are the models needed to simulate such structures?
Importance of long range strain effects
Schroedinger equation in tight-binding formalism
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Models
• What are the models needed to simulate such structures?
Importance of long range strain effects
Schroedinger equation in tight-binding formalism
![Page 30: Tutorial5: (real) Device Simulations – Quantum Dots](https://reader036.vdocuments.us/reader036/viewer/2022062521/56816938550346895de09d14/html5/thumbnails/30.jpg)
Shapes simulated
/
GaAs
InAs
/
GaAs
/
GaAs
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Shapes available
• shape
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Spatial Parallelization
• Spatial Parallelization (method 1)
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Spatial Parallelization
• Spatial Parallelization (method 2)
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Tutorials
Exercises
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References[1] R. Maranganti, P. Sharma, “Handbook of Theoretical and Computational Nanotechnology”, American Scientific
Publishers.[2] Martin Fuechsle, S. Mahapatra, F.A. Zwanenburg, Mark Friesen, M.A. Eriksson, Michelle Y. Simmons, “Spectroscopy of
few-electron single-crystal silicon quantum dots”, NATURE NANOTECHNOLOGY LETTER.[3] http://en.wikipedia.org/wiki/Quantum_dot[4] X. Michalet, et al., “Quantum Dots for Live Cells, in Vivo imaging, and Diagnostics”, NIH Public Press.[5] M. Usman et al., “Moving Toward Nano-TCAD Through Multimillion-Atom Quantum-Dot Simulations Matching
Experimental Data”, IEEE Transactions on Nanotechnology, Vol. 8, No. 3, May 2009.[6] www.decodedscience.com[7] S. Steiger, et al. “NEMO5: A parallel multiscale nanoelectronics modeling tool”, IEEE Transactions on Nanotechnology,
Vol. 10, No. 6, November 2011.[8] http://nanotechweb.org/cws/article/lab/46835[9] http://www.kprc.se/Framed/mainWindow.php?id=Doc/QDots.html[10] M. Reed, “Quantum Dots”, Scientific American, January 1993.