AVS 60th International Symposium and Exhibition
    Electronic Materials and Processing Thursday Sessions
       Session EM+AS+EN+TF-ThM

Paper EM+AS+EN+TF-ThM10
Organic Thin-Film Transistors Manufactured by Vacuum-Evaporation in a Roll-to-Roll Web-Coater Exploiting a Flash-Evaporated Polymer Gate Dielectric

Thursday, October 31, 2013, 11:00 am, Room 101 B

Session: Hybrid and Organic Electronics
Presenter: Z. Ding, University of Oxford, UK
Authors: Z. Ding, University of Oxford, UK
G. Abbas, University of Oxford, UK
H. Assender, University of Oxford, UK
D.M. Taylor, Bangor University, UK
E. Patchett, Bangor University, UK
A. Williams, Bangor University, UK
J. Morrison, University of Manchester, UK
S. Yeates, University of Manchester, UK
L. Lin, University of Leeds, UK
Correspondent: Click to Email
We have developed a process to make bottom gate top contact organic thin-film transistors (OTFTs) in a roll to roll vacuum web coater environment. The vacuum based all-evaporated process allows a solvent-free deposition to make organic/inorganic multilayer structures for thin-film electronic devices on a flexible substrate, at high speed. The polymeric gate dielectric layers have been fabricated by flash evaporation of acrylic monomers followed by radiation curing of E-Beam or Plasma onto a polymer film with pre-patterned metal gates. We now report our work on improving the performance of OTFTs by including modification of the dielectric surface, using new dielectric materials and new semiconductors. With a non-polar dielectric surface, charge carrier mobility of 1cm2/Vs; on/off current ratio of 108, sub-threshold slope of 0.3V/decade and saturated output curve was routinely achieved in DNTT transistors. The devices showed good stability in ambient environment with no need of encapsulation. Inverters and ring oscillators based on these transistors were fabricated successfully. The effect of mechanical deformation; aging time and aging environment on these thin-film devices were also investigated in this work.