Session 13: Substrates
Novel Polysulfide Substrates for Manufacturing Flex Displays and Flex Electronics
Wednesday, June 21, 2017
2:15 PM - 2:35 PM
In this talk, we will present a novel polysulfide flexible substrate (Pylux™) as a candidate material for flexible display manufacturing, including its key physical properties and evidence of excellent performance of IGZO-TFT devices fabricated on Pylux™, versus monitor substrates. Flexible displays are beginning to see adoption in commercial consumer products as ruggedized screens for smartwatches, smartphones and e-readers. However, fabrication of these displays in larger form-factors using traditional inorganic TFT microfabrication remains a challenge for display manufacturers. One primary issue is seen in the substrate material chosen for the TFT array: electronic grade polyimides (PI). While thermally-stable, the implemented versions of PI lack transparency, a uniform surface and introduce significant manufacturing cost and complexity in the form of long curing times, planarization layers and the laser-lift off equipment required for debonding from carrier substrates. Ares Materials, Inc. has developed Pylux™: a novel electronic-grade polysulfide substrate material that is more than 90% transparent in the visible spectrum and with an intrinsic surface roughness less than 0.5 nm. Thin films of Pylux™ (20+ µm) can be cast solvent-free and cured in less than one hour. Specialty release chemistries developed at Ares Materials can tune the adhesion of Pylux™ to any carrier substrate chosen, such that no laser-liftoff is required for mechanical release with a release stress below 1 MPa. Initial prototyping in an R&D fabrication line utilized 50um Pylux™, where Indium Gallium Zinc Oxide (IGZO) thin-film transistors (TFTs) were fabricated on 6-inch Si carrier wafers using standard photolithographic processes with excellent performance characteristics.
Dr. Tolis Voutsas is currently the VP of Business Development at Ares Materials. Prior to that, he held a number of engineering and management positions at SHARP Labs of America (SLA) focusing on display, sensor and flexible electronics. During his 22 year tenure at SLA, he participated in and led a wide variety of R&D projects across the whole spectrum of material, process, device, and system development for flat panel displays and sensor arrays. He has been responsible for several technology transfers to large-volume manufacturing and has led initiatives in the space of flexible and wearable electronics. He received his Ph.D. degree in Chemical Engineering from Lehigh University in 1994 with a doctoral thesis on advanced poly-Si material and device technologies for active-matrix LCDs. In 2000 he also received an M.S. degree in Management of Technology from Washington State University. He has authored over 60 papers in peer-reviewed journals, 3 book chapters, and has been awarded over 100 US patents. He has served as the VP of Americas Region for the Society for Information Display and has been active with IEEE and MRS professional societies.