Demonstration of Semiconducting Polymers for Microsprings
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Transcript of Demonstration of Semiconducting Polymers for Microsprings
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Demonstration of Semiconducting Polymers for Microsprings
Lilit AbramyanIMSURE Fellow
Mentors:John LaRue (MAE)Richard Nelson (EECS)
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Polymers
Low cost Easy processing Excellent thermal stability Flexibility
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Conducting Polymers
LEDs Transistors Optical devices Micro-electro-mechanical systems
Drug deliveryDLP (Digital Light Processing)
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Motivation
Plate
F(mechanical)
F(electrical)
Anchor
Spring
Electrode
Projection lens
Black hole absorption
http://www.dlp.com/tech/what.aspx
Image by Chang-hsiu Chen
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Plans
Thin films Electrical properties Equivalent circuit Surface morphology Young’s modulus
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Background Information
PEDOT poly(3,4-ethylenedioxythiophene) Good conductor Insoluble
PSS poly(styrenesulfonate) Makes dispersion with PEDOT in water
PVA (polyvinyl alcohol) Adds viscosity Better mechanical properties
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Solutions PEDOT:PSS
Baytron P (manufacturer-prepared) – conducting polymer
NMP (N-Methyl-2-pyrrolidone) – conductivity enhancement
Silquest – durability
Isopropanol – reduce surface energy
Dynol 604 – wetting agent
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Solutions (cont.)
Two separate solutions – PEDOT & PVA
Mix at different weight percentages
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Fabrication of Samples
Spin coat onto Silicon and glass Silver epoxy contacts
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Resistance & Conductivity
LAR
1
ρ=resistivity
R=resistance
A=cross-sectional area
L=length
σ=conductivity
Thickness - profilometer
Lower percentage of PEDOT→ More PVA→ More viscous→ Thicker films
L
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Transient Response
Pulse testing
Sample on Silicon Sample on Glass
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Initial Simulation Model
R1
21
C3
1 2
R3
21
R2
21
C2
1 2
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ImpedanceNyquist Plot
Phase vs. Frequency
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Equivalent Circuit (Final Simulation Model)
C p1 2
R 421
R 221
C 11 2
C 31 2
R 121
R 321
C 21 2
Impedance spectroscopy model
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SEM (Scanning Electron Microscope) Images
100% PEDOT
On glass
80% PEDOT
On glass
50% PEDOT On silicon
Soaked in water
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Resonant Frequency & Young’s Modulus Vibrometer at Polytec
(http://www.polytec.com)
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Acknowledgements
John LaRue Richard Nelson Allen Kine Chang-hsiu Chen Said Shokair Urop & IM-SURE National Science Foundation