semiconducting nanowires as nanoelectronic building blocks evan brown professor grace lu group...
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![Page 1: Semiconducting Nanowires as Nanoelectronic Building Blocks Evan Brown Professor Grace Lu Group September 2nd, 2005](https://reader036.vdocuments.us/reader036/viewer/2022062320/56649d435503460f94a1e80d/html5/thumbnails/1.jpg)
Semiconducting Nanowires as Semiconducting Nanowires as Nanoelectronic Building BlocksNanoelectronic Building Blocks
Evan Brown
Professor Grace Lu Group
September 2nd, 2005
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The Goal
• To make Zn nanowires using electrodeposition.
• To convert those wires into ZnO wires via thermal oxidization.
• To characterize the wires.
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The Goal Part 2
• Nanowires vertically aligned in a highly ordered template.
• Future small scale transistors.
• Can be used as the building blocks for simple logic gates and memory elements.
VdsVds Vgs
ZnO ZnO
Alumina Alumina Alumina
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The Process
2. Anodization
Al
1. Mechanically and ElectricallyPolished Aluminum
Al
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Anodization
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The Process3. Pore Opening
Al
4. Evaporation
Ti
Au
Al
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The Process
5. Bonding
Ti
Au
Al
Epoxy
Glass
5. Bonding
Ti
AuEpoxy
Glass
6. Lift-off
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The Process
Ti
AuEpoxy
Glass
7. Barrier Opening and Exposure
Ti
AuEpoxy
Glass
8. Electrodeposition
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Electrodeposition
• Originally, DC biasing was used to deposit.
• This gave varying results.
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Electrodeposition Part 2
• With different parameters came different results, but still not ideal.
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Electrodeposition Part 3
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Electrodeposition Part 4• We then tried Pulsed
Electrodeposition (PED) to improve the filling factor and uniformity of growth.
• An initial filling factor of ~75% was achieved.
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Electrodeposition Part 5
• Again,
vs.
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PED/DC
• Diffusion is the key.
• DC electrodeposition does not allow the electrolyte to diffuse evenly throughout all the pores.
• PED can be tailored to allow for the electrolyte's natural diffusion.
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The Results
• Preliminary electrical transport measurements have been taken.
Ti
AuEpoxy
Glass
AFM Probe
I
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The Results Part 2• I-V Curve of a purely
Zn nanowire.
Alumina
Zn
Alumina
AFM Probe
-10 -5 0 5 10-700
-600
-500
-400
-300
-200
-100
0
100
Cu
rre
nt
(nA
)
Voltage (V)
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The Results Part 3Red-Ti
Blue-Zn
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The Results Part 4
Red-Ti
Blue-Zn
Green-ZnO
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Acknowledgements
• Professor Jia “Grace” Lu, Joseph Fan, Dawei Wang, Marco Huang, CJ Chien.
• Said Shokair and the IM-SURE program.
• National Science Foundation