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Length-dependent performances of sodium deoxycholate-dispersed single-walled carbon nanotube thin-film transistors

Published online by Cambridge University Press:  15 October 2012

Rongmei Si ,
Hong Wang ,
Li Wei ,
Yuan Chen ,
Zhenfeng Wang  and
Jun Wei
Rongmei Si
Affiliation:
School of Chemical and Biomedical Engineering, Nanyang Technological University, Singapore 637459
Hong Wang
Affiliation:
School of Chemical and Biomedical Engineering, Nanyang Technological University, Singapore 637459
Li Wei
Affiliation:
School of Chemical and Biomedical Engineering, Nanyang Technological University, Singapore 637459
Yuan Chen*
Affiliation:
School of Chemical and Biomedical Engineering, Nanyang Technological University, Singapore 637459
Zhenfeng Wang
Affiliation:
Singapore Institute of Manufacturing Technology, Singapore 638075
Jun Wei
Affiliation:
Singapore Institute of Manufacturing Technology, Singapore 638075
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

The material characteristics of single-walled carbon nanotubes (SWCNTs) influence the performance of SWCNT thin-film transistors (TFTs). In this study, a density gradient ultracentrifugation method was used to sort surfactant (sodium deoxycholate)-dispersed SWCNTs by length. SWCNTs of 150 ± 33 nm and 500 ± 91 nm long were fabricated into TFTs. The results show that the performance of SWCNT-TFTs is tube length dependent. TFTs fabricated using 500-nm long tubes have maximum on/off ratio around 105 with the mobility at ∼0.15 cm2/(V s), which is much higher than that of TFTs using 150-nm long tubes. Shorter tubes need higher tube density to form semiconducting paths, leading to lower on/off ratio and high contact resistance. Surfactant-wrapped SWCNTs will bundle into ropes of different size when tube density is high. It is critical to control tube length as well as surfactant residue content to build high performance SWCNT-TFTs.

Keywords

nanostructurefilmmicroelectronics
Type
Articles
Information
Journal of Materials Research , Volume 28 , Issue 7: Focus Issue: De Novo Carbon Nanomaterials: Opportunities and Challenges in a Flat World , 14 April 2013 , pp. 1004 - 1011
Copyright
Copyright © Materials Research Society 2012

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