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Ink-jet printed thin-film transistors with carbon nanotube channels shaped in long strips
KTH, Skolan för informations- och kommunikationsteknik (ICT), Integrerade komponenter och kretsar.ORCID-id: 0000-0002-6430-6135
KTH, Skolan för informations- och kommunikationsteknik (ICT), Elektroniksystem. KTH, Skolan för informations- och kommunikationsteknik (ICT), Centra, VinnExcellence Center for Intelligence in Paper and Packaging, iPACK.
KTH, Skolan för informations- och kommunikationsteknik (ICT), Centra, VinnExcellence Center for Intelligence in Paper and Packaging, iPACK. KTH, Skolan för informations- och kommunikationsteknik (ICT), Elektroniksystem.
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2011 (Engelska)Ingår i: Journal of Applied Physics, ISSN 0021-8979, E-ISSN 1089-7550, Vol. 109, nr 8, artikel-id 084915Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

The present work reports on the development of a class of sophisticated thin-film transistors (TFTs) based on ink-jet printing of pristine single-walled carbon nanotubes (SWCNTs) for the channel formation. The transistors are manufactured on oxidized silicon wafer and flexible plastic substrates at ambient conditions. For this purpose, ink-jet printing techniques are developed aiming at high-throughput production of SWCNT thin-film channels shaped in long strips. Stable SWCNT inks with proper fluidic characteristics are formulated by polymer addition. The present work unveils, through Monte Carlo simulation and in the light of heterogeneous percolation, the underlying physics of the superiority of long-strip channels for SWCNT TFTs. It further predicts the compatibility of such a channel structure with ink-jet printing taking into account the minimum dimensions achievable by commercially available printers. The printed devices exhibit improved electrical performance and scalability, compared to previously reported ink-jet printed SWCNT TFTs. The present work demonstrates that ink-jet printed SWCNT TFTs of long-strip channels are promising building blocks for flexible electronics.

Ort, förlag, år, upplaga, sidor
American Institute of Physics (AIP), 2011. Vol. 109, nr 8, artikel-id 084915
Nationell ämneskategori
Fysik
Identifikatorer
URN: urn:nbn:se:kth:diva-24431DOI: 10.1063/1.3569842ISI: 000290047000242Scopus ID: 2-s2.0-79955723280OAI: oai:DiVA.org:kth-24431DiVA, id: diva2:349712
Anmärkning

QC 20110609

Tillgänglig från: 2010-09-08 Skapad: 2010-09-08 Senast uppdaterad: 2017-12-12Bibliografiskt granskad
Ingår i avhandling
1. Ink-jet printing of thin film transistors based on carbon nanotubes
Öppna denna publikation i ny flik eller fönster >>Ink-jet printing of thin film transistors based on carbon nanotubes
2010 (Engelska)Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
Abstract [en]

The outstanding electrical and mechanical properties of single-walled carbon nanotubes (SWCNTs) may offer solutions to realizing high-mobility and high-bendability thin-film transistors (TFTs) for the emerging flexible electronics. This thesis aims to develop low-cost ink-jet printing techniques for high-performance TFTs based on pristine SWCNTs. The main challenge of this work is to suppress the effects of “metallic SWCNT contamination” and improve the device electrical performance. To this end, this thesis entails a balance between experiments and simulations.

 

First, TFTs with low-density SWCNTs in the channel region are fabricated by utilizing standard silicon technology. Their electrical performance is investigated in terms of throughput, transfer characteristics, dimensional scaling and dependence on electrode metals. The demonstrated insensitivity of electrical performance to the electrode metals lifts constrains on choosing metal inks for ink-jet printing.

 

Second, Monte Carlo models on the basis of percolation theory have been established, and high-efficiency algorithms have been proposed for investigations of large-size stick systems in order to facilitate studies of TFTs with channel length up to 1000 times that of the SWCNTs. The Monte Carlo simulations have led to fundamental understanding on stick percolation, including high-precision percolation threshold, universal finite-size scaling function, and dependence of critical conductivity exponents on assignment of component resistance. They have further generated understanding of practical issues regarding heterogeneous percolation systems and the doping effects in SWCNT TFTs.

 

Third, Monte Carlo simulations are conducted to explore new device structures for performance improvement of SWCNT TFTs. In particular, a novel device structure featuring composite SWCNT networks in the channel is predicted by the simulation and subsequently confirmed experimentally by another research group. Through Monte Carlo simulations, the compatibility of previously-proposed long-strip-channel SWCNT TFTs with ink-jet printing has also been demonstrated.

 

Finally, relatively sophisticated ink-jet printing techniques have been developed for SWCNT TFTs with long-strip channels. This research spans from SWCNT ink formulation to device design and fabrication. SWCNT TFTs are finally ink-jet printed on both silicon wafers and flexible Kapton substrates with fairly high electrical performance.

Ort, förlag, år, upplaga, sidor
Stockholm: KTH, 2010. s. xiv, 58
Serie
Trita-ICT/MAP AVH, ISSN 1653-7610 ; 2010:08
Nyckelord
Single-walled carbon nanotube, thin film transistor, ink-jet printing, Monte Carlo simulation, stick percolation, composite network, flexible electronics
Nationell ämneskategori
Annan elektroteknik och elektronik
Identifikatorer
urn:nbn:se:kth:diva-24427 (URN)978-91-7415-717-8 (ISBN)
Disputation
2010-09-24, Sal D, KTH Forum, Isafjordsgatan 39, Kista, 13:15 (Engelska)
Opponent
Handledare
Anmärkning
QC 20100910Tillgänglig från: 2010-09-10 Skapad: 2010-09-08 Senast uppdaterad: 2010-09-10Bibliografiskt granskad

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