Paul Brookes - Materials for Printed Transistors: More than Proof of Concept!

Session 4: FPE Technologies

Materials for Printed Transistors: More than Proof of Concept!
Tuesday, June 20, 2017 
2:40 PM - 3:00 PM

Over recent years advances in organic thin film transistor research have shifted from mobility and peak performance to processability, operational stability and integration. This is particularly true at EMD Performance Material where we have developed a portfolio of both organic active and passive materials and formulations designed to support application performance, with a demonstrated compatibility with real manufacturing processes such as high-throughput photolithographic and roll-to-roll printing processes.

Fully high-speed printed transistors for pixel selection, signal amplification or logic will play a key role in enabling future low-cost, flexible electronics. Whilst substantial innovations in equipment accuracy/resolution and material engineering will be required to print electronic features leveraging the precision of silicon microfabrication, their simple manufacture using industrially scalable processes, with EMD’s high-performance printable organic semiconductor and dielectric inks, has already been successfully demonstrated.

Last year we presented material developments undertaken to realise an all-printable, air-stable polymer transistor stack on plastic, by rotogravure. Novel formulation concepts for our SP400 semiconductor and matched dielectric set were exploited to achieve increased layer uniformity, yield and process stability in discrete transistors, without the need for extra surface treatments or temperatures exceeding 130°C.

In this paper, we present the implementation of a similar strategy for SP500, a higher performing polymer semiconductor with potential greater than 2 cm2/Vs. Further improvements are demonstrated at TFT array level with focus on increased pattern resolution and gravure registration accuracy. We show that the direct photo-patternability of our AP048 dielectric can be exploited when resolutions higher than currently achievable with printing are needed, e.g. to open sub-10mm via-holes, in a single subtractive step.

This further validates the market readiness of EMD Performance Materials solution-processed organic materials for Printed Electronics.


Speaker's Biography

Dr. Paul Brookes has worked in the field of organic electronics for almost 20 years in synthesis, formulation and device characterization. He received a PhD from the University of Wales, Bangor, UK in organic synthesis. For the last 15 years he has worked on material and process development at EMD Performance Materials Corp, an affiliate of Merck KGaA, Darmstadt, Germany. His current role is a Technology Scout and Business Development Manager for EMD Performance Materials Advanced Technologies Division, this role involved material development and device optimization leading on to customer project management where he now works closely with Merck KGaA global customer base to optimize and improve Merck KGaA material and formulation offerings in the Organic Electronics industry.


Paul Brookes
EMD Performance Materials Corp