Development of materials and printing methods for fabrication of thin-film transistors on flexible substrates

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In the present work, we attempted to put together a suite of technologies for printing TFTs on flexible substates. The ink materials we investigated include optimized SCNT inks as printable semiconductors, development of composite ion-gel as dielectrics and nanosilver ink as conductors. The printing methods we investigated include inkjet printing, aerosol jet printing and a hybrid with nanoimprinting. Large area source and drain electrode patterns were first fabricated on flexibe substrates by a hybrid printing method, and then SCNT thin films were deposited on the channel of TFT devices by ink-jet printing. Subsequently, the silver side-gate electrode and ion gel dielectric layer were deposited by aerosol jet printing. Figure 1 shows optical images of printed TFT and its electrical properties. The all-printed TFT has the effective mobility up to 1.3 cm2/Vs and on/off ratio up to 103. The detailed investigations will be presented in the paper.

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Journal: TechConnect Briefs
Volume: 1, Nanotechnology 2012: Advanced Materials, CNTs, Particles, Films and Composites (Volume 1)
Published: June 18, 2012
Pages: 248 - 251
Industry sector: Advanced Materials & Manufacturing
Topic: Carbon Nano Structures & Devices
ISBN: 978-1-4665-6274-5