solution-processed flexible memory devices dr. nadine gergel-hackett dr. behrang hamadani dr. curt...
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Solution-Processed Flexible Memory Devices
Dr. Nadine Gergel-HackettDr. Behrang Hamadani
Dr. Curt RichterDr. David Gundlach
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Technology
MotivationFlexible electronics is an emerging industry that “sprays” electronic devices onto inexpensive plastic sheets(like inkjet printer on an overhead transparency)
Problem: Currently no method exists in flexible electronics for fabricating non-volatile low operation voltage memory devices ie devices that “hold” written state without an applied voltage
Completed design and fabrication of electronic memory devices on inexpensive plastic substrates
actual devices
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Commercial Applications
Integrated Sensor is Structure – T. Clark/DARPA
sensor pack
power supplyprocessor &RFID communication
Memory indisplay
Sensor Tape – J. Ricklin/DARPA
Flexible memory devices would have applications in almost all flexible electronics circuits, some possible uses of flexible electronics include:
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Advantages of Method of Device Fabrication:
• Can be performed at room temperature and pressure
• Simplified design
• Inexpensive fabrication procedures
Technology - Combining separate existing technologies
(a)Contact
Contact
Flexible Substrate
Sol gel
TiO2
actual devices
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Technology•Devices showed an electrical switching with memory behavior
-6 -5 -4 -3 -2 -1 0 1 2 3 4 5 6-4x10-4
-2x10-4
0
2x10-4
4x10-4
Cur
rent
(A
)
Voltage (V)
Electrical characteristics of device
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Technology Applications
Areas for Improvement:
“write” and “erase” voltage values, and on/off ratios vary between devices, and increase with operation
Devices switched maximum of <10 times before permanently remaining in high state
Source of electrical switching behavior not yet well studied
-4 -2 0 2 4
-5.0x10-3
0.0
5.0x10-3
1.0x10-2
Cur
rent
(A
)
Voltage (V)
1
2
3
4
5
6
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Technology Applications
0 20 40 60 80
-28.0
-24.5
-21.0
-17.5
-14.0
-10.5
-7.0
-3.5
0.0
3.5
7.0
logic
"0" logic "0"
Vol
tage
App
lied
(V)
Time (s)
logic "1"
readreadread
write
erase
Cur
rent
(A
)
0.02
0.01
0.00
-0.01
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Potential Applications :The Missing Piece for the Realization of Flexible Electronics
DisplaySensors
Logic
(computing)
Memory (Low
Power,
Re-Write
able)
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“Solution-Processed Flexible Titanium Dioxide Memory Devices”
Provisional patent application filed 1/22/08serial # 51/022,534
Licensing & Collaboration Opportunity
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Contact Information
Nadine Gergel-Hackett, [email protected]
David Gundlach, [email protected]
Curt Richter, [email protected]