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Fabrication of Homogeneous Thin Films of Semiconductor-Enriched Single-Wall Carbon Nanotubes for Uniform-Quality Transistors by Using Immersion Coating

Morphology-controlled deposition and macroscopic uniformity of films are critical for practical use of single-wall carbon nanotube transistors. In this study, we used immersion coating to prepare uniform thin films and demonstrated the morphology-controlled deposition by changing the concentrations of the surfactant and nanotubes. The correlation between the thin-film morphology and the transfer characteristics of the transistors fabricated on the film are discussed. Fifteen transistors fabricated on the optimized thin film showed similar transfer characteristics, with a low coefficient of variation of the on-current, while maintaining a high on/off ratio, high on-current, and high mobility.