Journal of Electronic Materials

, Volume 42, Issue 12, pp 3481–3488

Composite Semiconductor Material of Carbon Nanotubes and Poly[5,5′-bis(3-dodecyl-2-thienyl)-2,2′-bithiophene] for High-Performance Organic Thin-Film Transistors

Article

DOI: 10.1007/s11664-013-2785-7

Cite this article as:
Derry, C., Wu, Y., Zhu, S. et al. Journal of Elec Materi (2013) 42: 3481. doi:10.1007/s11664-013-2785-7

Abstract

A nonpercolating network of non-covalently functionalized single-walled carbon nanotubes was embedded within air-stable poly[5,5′-bis(3-dodecyl-2-thienyl)-2,2′-bithiophene] (PQT-12) thin films for the purpose of enhancing the field-effect mobility in thin-film transistors. The host polymer was used to stabilize the nanotubes in suspension through π-orbital overlap caused by simple application of ultrasonication. The stable nanotube suspension was cast into two different device architectures, both of which exhibited excellent on/off ratios ranging from 105 to 106 and dramatically improved mobilities compared with pristine PQT-12 semiconductor. A single-layer film with nanotubes embedded throughout was easy to fabricate and had mobility up to 0.34 cm2/Vs, an enhancement of over 3× compared with PQT-12. Placing the nanotubes closer to the dielectric surface in a dual-layer approach resulted in a mobility improvement of up to six times (0.58 cm2/Vs). The effects of the nanotube content on the polymer interaction within the suspension, film morphology, and electrical properties were investigated as well.

Keywords

Organic thin-film transistors polythiophene semiconductor single-walled carbon nanotubes field-effect mobility 

Copyright information

© TMS 2013

Authors and Affiliations

  1. 1.Advanced Materials LaboratoryXerox Research Centre of CanadaMississaugaCanada
  2. 2.Department of Material Science and EngineeringMcMaster UniversityHamiltonCanada
  3. 3.Department of Chemical EngineeringMcMaster UniversityHamiltonCanada
  4. 4.Department of Electrical and Computer EngineeringMcMaster UniversityHamiltonCanada