nano+nuclear batteriesbetavoltaic batteries ¥ direct conversion pn-junction type ¥ radiation...
TRANSCRIPT
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Nano+Nuclear
Batteries
Mark Paulson
STS 201
4/18/05
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Introduction
• Radioisotope Overview
• Betavoltaic
• Self Reciprocating Cantilever
• Macro->Micro->Nano->Application
• Environmental/Social Impact
• Questions Anytime
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Nuclear Battery?
RADIOISOTOPE FUEL
• Type of radiation
–Alpha
–Beta
• Half-Life
Long -> Long battery life
Short -> Higher power
Goal: Convert energy from radioactive decay to electricity
3000210-Po (5% -4
years)
3Fuel Cell
(methanol, 50%)
5003-H (5% -4 years)
0.3Chemical Battery
(Li-ion)
Energy
Content
(mW-hr)
Source
Consider 1 mg for power source
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Betavoltaic Batteries
• Direct Conversion pn-JunctionType
• Radiation Energy Used toCreate Electron Hole Pairs(EHP) Near Junction
• EHPs Diffuse into the DepletionRegion of the Semiconductor pn-Junction
• Resulting Current is from n- top-type semiconductor
• Net Power Can be Extracted
•0.04~0.24nW
Nanopower
•0.1~0.3% Efficiency
•No Performance
Degradation
After 1 year
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Inverted Pyramid Betavoltaic
• Increased pn-Junction
Area-> Increased
Depletion Region
• Liquid or Gas Solute
Source•0.32nW (128mV/2.86nA)
obtained
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Self Reciprocating Cantilever
• Ionizing Radiation
Accumulates Charge On
Cantilever
• Leads to Attractive Force
• Beam Discharges When
Close or On Contact
• Resulting Movement is a
Periodic Charge Integrator
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Scaling Down to Nano
• Long History of Nuclear Battery Use
• Currently No Nano-Nuclear Batteries
• Nuclear Physics Works on Nano-scale
• Limited by Ability to NanoFabricate
• Research Driven by MEMSApplication
• Major Funding by Military
• Consumer Electronic Application?
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Environmental/Social Impact
“AAAAAAAAAAA” Battery
• Viable Power Source
for MEMS and Similar
Systems
• Recycle Nuclear Waste
• Aren’t Cheap
Radiological
• Small Dose
• Increase in
the
Probability of
Exposure
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Question?
• Thanks to James Blanchard, Hui
Li, Amit Lal, and Douglass
Henderson for Borrowed Pictures