Carbon Nanotube Thin Film Transistors for Printed Electronics

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2 Νοε 2013 (πριν από 4 χρόνια και 12 μέρες)

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Carbon Nanotube Thin Film Transistors

for Printed

Electronics

Kimmo Ojanperä
1
,

Patrik Laiho
2
,
Antti Kaskela
2
,

Toma Susi
2
,
Ari Alastalo
1
,

Esko
Kauppinen
2


1
VTT
,
Printed Functional Solutions
,
Finland

(
Kimmo.ojanpera@vtt.fi
)

2
Department of Applied Physics,
Aalto University

School of Science
,
Finland

We present single
-
walled carbon
-
nanotube (SWCNT) thin
-
film transistors (TFT) fabricated
on
a

plastic substrate using a hybrid manufacturing method.
The device structure is
a
bottom
-
gate top
-
contact (BGTC)

configu
ration
.

The
SWCNT

network
for the TFT channel

w
as

collected on
to a

nitrocellulose membrane filter
directly from a floating catalyst CVD reactor
[1],

and
press

transferred onto
a

plastic
PEN
substrate
followed
by the dissolution of the filter
in acetone.
Be
fore the press transfer, t
he
gate electrode
was shadow
-
evaporated

and
a

polyimide dielectric layer

spun
-
cast on
the substrate
.

Finally, t
he

source
and drain electrodes
were inkjet
-
printed on top of the
percolating

SWCNT network.

The TFTs were characterized

in ambient conditions
by transfer curve measurements

using
a

Keithley 4200
Semiconductor Characterization System
.

The
TFT
s

had mobilit
ies

on
the order

of 4
cm
2
/Vs and on/off
-
ratio
s

over 10
3
,

with
the
measurement voltage rang
ing

from
-
10 V to
+5 V.

T
he TFT

performance
was limited by the combination of

materials, impurities,
statistical variation of the deposition processes
,

and
the
roughness of the substrate
and
the
solution
-
processed surfaces.
The demonstrated process can be used to fabricate, for example,

ba
ck
plane circuits of flexible displays
.

[1]
Sun, D.
-
m., M.Y. Timmermans, Y. Tian, A.G. Nasibulin, E.I. Kauppinen, S. Kishimoto, T.
Mizutani, and Y. Ohno, Nature Nanotech., 2011.
6
(3): p. 156
-
161.