Peter C. Wilson, Constantina Lekakou, John F. Watts Ink Jet Printing and Spin-coating of Electrically Conductive Polymers Presentation Outline • PhD Outline • Background • Custom Ink Jet Printing Equipment • Electro-impedance Model • Charge Transport Method • Microscale Comparison • Mobility & Morphology • Ongoing & Future Work
29
Embed
Ink Jet Printing and Spin-coating of Electrically ... · Peter C. Wilson, Constantina Lekakou, John F. Watts Ink Jet Printing and Spin-coating of Electrically Conductive Polymers
This document is posted to help you gain knowledge. Please leave a comment to let me know what you think about it! Share it to your friends and learn new things together.
Transcript
Peter C. Wilson, Constantina Lekakou, John F. Watts
Ink Jet Printing and Spin-coating
of Electrically Conductive Polymers
Presentation Outline
• PhD Outline
• Background
• Custom Ink Jet Printing Equipment
• Electro-impedance Model
• Charge Transport Method
• Microscale Comparison
• Mobility & Morphology
• Ongoing & Future Work
Peter C. Wilson, Constantina Lekakou, John F. Watts
Ink Jet Printing and Spin-coating
of Electrically Conductive Polymers
PEDOT Useage
Simple organic device structure displaying PEDOT:PSS as a
high work function anode
Figure 8 - Comparative assessment of
PEDOT:PSS films compared to ITO
layers.
Device life-time is omitted ~ 7x ITO
Peter C. Wilson, Constantina Lekakou, John F. Watts
Ink Jet Printing and Spin-coating
of Electrically Conductive Polymers
Gas Line
Motors
Control Cards
JetServer
Camera
Reservoir
Heat Pad
Substrate Temp Control
Jetter
Strobe
Control Program
Monitor
Inkjet Printer Setup
Peter C. Wilson, Constantina Lekakou, John F. Watts
Ink Jet Printing and Spin-coating
of Electrically Conductive Polymers
InkJet Printer OverviewControllable Parameters
• Drop size
• Ejection wave guide architecture
• Drop velocity
• Drop / substrate Temperature
• Drop placing / overlap
• Print rate
• Print layering
• Ejection angle
• Drop chemistry
Rig Specification
250dpi @ Ts = 50deg C
Position accuracy < 2μm (at 1/8th step)
Position repeatability < 10 μm
Print rate from 0 – 100mm s-1
Print acceleration 0 – 100m s-2Transmission Optical Microscopy Of
Printed PEDOT:PSS Tracks - 100um orifice jetter, 5% drop overlap
Peter C. Wilson, Constantina Lekakou, John F. Watts
Ink Jet Printing and Spin-coating
of Electrically Conductive Polymers
PEDOT:PSS Surface Tension As A Function Of DMSO DMSO & Surfynol 2502
Concentration
0
0.01
0.02
0.03
0.04
0.05
0.06
0.07
0.08
0 1 2 3 4 5 6
DMSO %wt
Surf
ace T
ensio
n (
N/m
)
0% Surfynol
1% Surfynol
Linear (0% Surfynol)
Peter C. Wilson, Constantina Lekakou, John F. Watts
Ink Jet Printing and Spin-coating
of Electrically Conductive Polymers
Electro-impedance Spectroscopy
Nyquist plot for Inkjet Printed PEDOT:PSS (5%wt DMSO, 0%Surfynol) at 93K
Peter C. Wilson, Constantina Lekakou, John F. Watts
Ink Jet Printing and Spin-coating
of Electrically Conductive Polymers
Electro-impedance Spectroscopy
|REL| Bode plot for Inkjet Printed PEDOT:PSS (5%wt DMSO, 0%Surfynol) at 93K
Peter C. Wilson, Constantina Lekakou, John F. Watts
Ink Jet Printing and Spin-coating
of Electrically Conductive Polymers
Electro-impedance Spectroscopy
Zplot model fitting for Inkjet Printed PEDOT:PSS (5%wt DMSO, 0%Surfynol) at 93K
Peter C. Wilson, Constantina Lekakou, John F. Watts
Ink Jet Printing and Spin-coating
of Electrically Conductive Polymers
Electro-impedance Spectroscopy
Zplot equivalent circuitry for Inkjet Printed PEDOT:PSS (5%wt DMSO, 0%Surfynol) at 93K
Series Resistance
Surface capacitive region
Bulk PEDOT:PSS film
Peter C. Wilson, Constantina Lekakou, John F. Watts
Ink Jet Printing and Spin-coating
of Electrically Conductive Polymers
Surface Resistivity For 0-1% Surfynol, 0-5% DMSO InkJet Printed Films
1.00E+02
1.00E+03
1.00E+04
1.00E+05
1.00E+06
1.00E+07
0 1 2 3 4 5
DMSO %wt
Res
isti
vit
y W
/sq
Surface Resistivity (0%wt Surfynol)
Surface Resistivity (1%wt Surfynol)
Peter C. Wilson, Constantina Lekakou, John F. Watts
Ink Jet Printing and Spin-coating
of Electrically Conductive Polymers
4-Point Hall Probe demonstrate the effect on carrier mobility in inkjet printed PEDOT:PSS thin films
• 0% DMSO, 1% Surfynol,
•
• 1.164x 105 W sq-1 ~ 11 W cm-1 (0.09 S cm-1)
• Carrier Mobility 1.43 cm-2 v-1s-1
• Carrier Concentration ~ 3.74 x1013 cm-2
• 5% DMSO, 1% Surfynol,
• 633 W sq-1 ~ 6.33 x10-2 W cm-1 (16 S cm-1)
• Carrier Mobility 397 cm-2 v-1s-1
• Carrier Concentration ~ 2.48 x1013 cm-2
Printed samples displayed ohmic contacts and excellent film uniformity
Peter C. Wilson, Constantina Lekakou, John F. Watts
Ink Jet Printing and Spin-coating
of Electrically Conductive Polymers
Surface Resistivity For 0-1% Surfynol, 0-5% DMSO Spin Coated Films
1.00E+03
1.00E+04
1.00E+05
1.00E+06
1.00E+07
1.00E+08
0 1 2 3 4 5
DMSO %wt
Re
sist
ivit
y W
/sq
Surface Resistivity (0% Surfynol)
Surface Resistivity (1% Surfynol)
Peter C. Wilson, Constantina Lekakou, John F. Watts
Ink Jet Printing and Spin-coating
of Electrically Conductive Polymers
x
e
Peter C. Wilson, Constantina Lekakou, John F. Watts
Ink Jet Printing and Spin-coating
of Electrically Conductive Polymers
T
TEXP 0
0
Mott Variable Range Hopping Law,
denote the recipical dimensionality of conduction
the conductivity
o & T0 are material constants
Peter C. Wilson, Constantina Lekakou, John F. Watts
Ink Jet Printing and Spin-coating
of Electrically Conductive Polymers
Reproduced from - A. M. Nardes, M. Kemerink, R. A. J. Janssen,
“Anisotropic hopping conduction in spin coated PEDOT:PSS thin films”,
Phys. Rev. B 2007, 76, 085208-1.
Charge transport asymmetry in spin coated
PEDOT:PSS films due to oblate spheroid-type
conducting grain morphology
- 3d variable range hopping in the parallel plane
- Space Charge limited tunnelling in the normal plane
Peter C. Wilson, Constantina Lekakou, John F. Watts
Ink Jet Printing and Spin-coating
of Electrically Conductive Polymers
Processing Dynamics
The deposit, spin, spread & evaporate
process for spin coated films
Fluid flow in drying droplets displaying
surface & interface evaporation and
redistributive flow
Peter C. Wilson, Constantina Lekakou, John F. Watts