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Self-Sorted Nanotube Networks on Polymer Dielectrics for Low-Voltage Thin-Film Transistors

2009; American Chemical Society; Volume: 9; Issue: 7 Linguagem: Inglês

10.1021/nl900287p

1530-6992

Mark E. Roberts, Melburne C. LeMieux, Anatoliy N. Sokolov, Zhenan Bao,

Organic Electronics and Photovoltaics

Recent exploitations of the superior mechanical and electronic properties of carbon nanotubes (CNTs) have led to exciting opportunities in low-cost, high performance, carbon-based electronics. In this report, low-voltage thin-film transistors with aligned, semiconducting CNT networks are fabricated on a chemically modified polymer gate dielectric using both rigid and flexible substrates. The multifunctional polymer serves as a thin, flexible gate dielectric film, affords low operating voltages, and provides a platform for chemical functionalization. The introduction of amine functionality to the dielectric surface leads to the adsorption of a network enriched with semiconducting CNTs with tunable density from spin coating a bulk solution of unsorted CNTs. The composition of the deposited CNT networks is verified with Raman spectroscopy and electrical characterization. For transistors at operating biases below 1 V, we observe an effective device mobility as high as 13.4 cm2/Vs, a subthreshold swing as low as 130 mV/dec, and typical on−off ratios of greater than 1,000. This demonstration of high performance CNT thin-film transistors operating at voltages below 1 V and deposited using solution methods on polymeric and flexible substrates is an important step toward the realization of low-cost flexible electronics.