Fabrication and characterization of thin-film transistors based on printable functionalized single-walled carbon nanotubes
Zhao J., Lin J., Chen Z., Cui Z.
In this study, we successfully fabricated single-walled carbon nanotube (SCNT) thin-film transistors (TFTs) by ink-jet printing technology using the prepared high-quality SCNT ink. The SCNT inks were obtained by chemically functionalized CoMoCat 76 with 2, 2-azobisisobutyronitrile (AIBN). The absorption spectra, Raman spectra and photoluminescence excitation (PLE) spectra demonstrated that metallic species and small diameter semiconducting species in CoMoCat 76 were effectively eliminated after reaction with AIBN. As-prepared SCNTs inks were directly used to print TFTs using Aerosol Jet printing system without any purification. The printed top-gated and bottom-gated TFTs exhibited the effective mobility of ∼0.5 cm2/Vs and on/off ratio of over 103. Especially, hysteresis was eliminated using commercial polydimethoxysilane (PDMS) elastomer containing ion liquid as the top gate dielectric. The process opens the route to fabricate all printed high performance SCNT TFTs on flexible substrate.