Solution Assembly of Organized Carbon Nanotube Networks for Thin-Film Transistors

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• 作者：Melburne C. LeMieux ; Seihout Sok ; Mark E. Roberts ; Justin P. Opatkiewicz ; Derrick Liu ; Soumendra N. Barman ; Nishant Patil ; Subhasish Mitra ; Zhenan Bao
• 刊名：ACS Nano
• 出版年：2009
• 出版时间：December 22, 2009
• 年：2009
• 卷：3
• 期：12
• 页码：4089-4097
• 年卷期：0
• ISSN：1936-086X

文摘

Ultrathin, transparent electronic materials consisting of solution-assembled nanomaterials that are directly integrated as thin-film transistors or conductive sheets may enable many new device structures. Applications ranging from disposable autonomous sensors to flexible, large-area displays and solar cells can dramatically expand the electronics market. With a practical, reliable method for controlling their electronic properties through solution assembly, submonolayer films of aligned single-walled carbon nanotubes (SWNTs) may provide a promising alternative for large-area, flexible electronics. Here, we report SWNT network TFTs (SWNTntTFTs) deposited from solution with controllable topology, on/off ratios averaging greater than 10p>5p>, and an apparent mobility averaging 2 cmp>2p>/V·s, without any pre- or postprocessing steps. We employ a spin-assembly technique that results in chirality enrichment along with tunable alignment and density of the SWNTs by balancing the hydrodynamic force (spin rate) with the surface interaction force controlled by a chemically functionalized interface. This directed nanoscale assembly results in enriched semiconducting nanotubes yielding excellent TFT characteristics, which is corroborated with μ-Raman spectroscopy. Importantly, insight into the electronic properties of these SWNT networks as a function of topology is obtained.