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Organic & Polymer Electronics Laboratory
Lynn Loo
Office: CPE 4.422; Labs: 3.436 & 3.438
471-6300
http://www.engr.utexas.edu/che/directories/faculty/loo.cfm
“Towards large-area
flexible displays:
solventless thermal laser
ablation printing of
conductive polymers,”
Featured in Nature
Materials, January, 2003.
“Water-proof plastic circuitry by
lamination,” Featured in Materials
Today, October, 2002.
Introduction: The World’s First Electronic Paper
Rogers et al., Proc. Nat. Acad. Sci. USA 2001.
Backplane: Organic Transistors on Plastic Substrate
Rogers et al., Proc. Nat. Acad. Sci. USA 2001.
Why Organic Materials and Plastic Substrates?
• Improved mechanical flexibility and bendability
• Large-area coverage
• Compatible with high-speed reel-to-reel fabrication
• Low production costs
Potential applications in large-area flexible displays, disposable RF
tags, wearable electronics, etc.
e.g., the first OLED active matrix display digital camera by Kodak
(March, 2003)
Kodak LS 633
http://www.kodak.com
Group Focus
• Design and synthesis of new materials for electronic
applications (Bucholz, Guloy, Smith)
• Understanding structure-property interrelationships and how
they can impact device performance (Krapchetov, Lee, Khan)
• Developing unconventional, non-invasive materials
processing, patterning, and printing technologies specifically
for organic device fabrication (Felmet, Lee, Mitchell)
Group photo, December 2003.
Organic and Polymer Electronics Laboratory
1 polymer chemistry/physics project available;
can be co-advised with Prof. Ganesan
1 patterning project available
SMM
Design & SynthesisTLB
Structure & Property
Device Fabrication
of
Relationships
KSL & Testing
Functional Polymers
ASG
QAS
MFK
KCF
DAK
Downstream
Kwang Seok Lee: Patterning Water-Soluble,
Conductive Polyaniline
1. Surface treat SiOx
2. Stamp hydrophobic molecules on surface
PDMS stamp coated with
octadecyltrichlorosilane
3. Hydrophobic/hydrophilic
pattern from microcontact printing
4. Dip-coat polyaniline
Partially supported by DuPont Young Professor Grant
200 mm
Preliminary Electrical Characterization
Conductivity measurements:
Organic transistors that use PANI electrodes:
pentacene
10
SiOx dielectric
Si gate
PANI electrodes
0
6
-2 10
-7
-4 10
-7
-6 10
-7
4
2
r = 0.06 S/cm
0
0
0.1
0.2
0.3
0.4
Length (cm)
0.5
0.6
Isd (Amps)
RA (ohm-cm2)
8
-8 10
-7
-1 10
-6
Vg = 0
-10V
-20V
-30V
-40V
-50V
-50
-40
-30
-20
-10
0
Vsd (Volts)
Collaborators: Graciela Blanchet and Feng Gao, DuPont Central Research, Wilmington, DE
Results will be presented at the Spring ACS Meeting, Anaheim, CA; 03/2004.