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2015 ; 5
(ä): 14459
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English Wikipedia
Scalability of carbon-nanotube-based thin film transistors for flexible
electronic devices manufactured using an all roll-to-roll gravure printing
system
#MMPMID26411839
Koo H
; Lee W
; Choi Y
; Sun J
; Bak J
; Noh J
; Subramanian V
; Azuma Y
; Majima Y
; Cho G
Sci Rep
2015[Sep]; 5
(ä): 14459
PMID26411839
show ga
To demonstrate that roll-to-roll (R2R) gravure printing is a suitable advanced
manufacturing method for flexible thin film transistor (TFT)-based electronic
circuits, three different nanomaterial-based inks (silver nanoparticles, BaTiO3
nanoparticles and single-walled carbon nanotubes (SWNTs)) were selected and
optimized to enable the realization of fully printed SWNT-based TFTs (SWNT-TFTs)
on 150-m-long rolls of 0.25-m-wide poly(ethylene terephthalate) (PET). SWNT-TFTs
with 5 different channel lengths, namely, 30, 80, 130, 180, and 230 ?m, were
fabricated using a printing speed of 8 m/min. These SWNT-TFTs were characterized,
and the obtained electrical parameters were related to major mechanical factors
such as web tension, registration accuracy, impression roll pressure and printing
speed to determine whether these mechanical factors were the sources of the
observed device-to-device variations. By utilizing the electrical parameters from
the SWNT-TFTs, a Monte Carlo simulation for a 1-bit adder circuit, as a
reference, was conducted to demonstrate that functional circuits with reasonable
complexity can indeed be manufactured using R2R gravure printing. The simulation
results suggest that circuits with complexity, similar to the full adder circuit,
can be printed with a 76% circuit yield if threshold voltage (Vth) variations of
less than 30% can be maintained.