Ta-Ya Chu - Ultra-Narrow Channels and Lines for All-Printed OTFTs

Session 22: Direct Write

Ultra-Narrow Channels and Lines for All-Printed OTFTs
Thursday, June 22, 2017 
11:40 AM - 12:00 PM

We report the development of inkjet-printed organic thin-film transistors (OTFTs), inverters and logic circuits on PET substrate. Charge carrier mobility reached 1 cm2/Vs and 0.1 cm2/Vs on p-type and n-type 3-layer-printed OTFTs with an operation voltage of 15 V. Thin and uniform dielectric layer was achieved by introducing coffee ring effect during printing process. All printed OTFTs with a channel length of 3 µm were fabricated by direct printing process. We also succeeded in inkjet printing sub-micrometer Ag lines by using a commercial 10 pl nozzle and proper control of the ink-substrate interaction and drying process. Our results demonstrated the full potential of printed transistors for flexible electronics in the near future.


Speaker's Biography

Dr. Chu has been working as a Research Officer at National Research Council Canada since 2008. He has more than fifteen years experiences in the field of organic electronics, such as OLED, OPV, OTFT and printable electronics. He is currently a Project Leader for the development of printed OTFTs and logic circuits on flexible substrate. He has contributed more than forty publications which have been cited more than 2200 times and Ta-Ya is a named inventor on 8 US patents.

While working on his PhD at National Chiao Tung University in Taiwan, Dr. Chu invented the inverted bottom-emission OLED which was rewarded as the most valuable research by Chunghwa Picture Ltd. in 2005 and 2006. Because of his achievements in OLED R&D, Samsung SDI invited him to join R&D group for OLED mass production in South Korea after his graduation in 2006. In 2008, he joined National Research Council Canada to extend his research from small molecular based OLEDs to the solution processable polymer based organic electronics.

After three years R&D at NRC, he broke the world record efficiency in the inverted organic photovoltaics (OPV) and received the “Outstanding Research Achievement Award” from NRC-IMS in 2011. One of the OPV cells he made in the lab has been demonstrated at the Canada Science and Technology Museum in Ottawa since 2011. The world’s largest photovoltaic conference, EU PVSEC, also invited him to serve as a member of the International Scientific Committee from 2011 to 2014.

He has been focusing on the research and development of printable electronics since 2012, e.g. using inkjet printing technology to produce functional circuits with printed organic transistors on flexible substrates. Together with the team members, he awarded "Technology Development Award" by NRC-ICT in 2016. He believe that this emerging technology will bring a significant contribution into our real world in the near future.


Ta-Ya Chu
National Research Council Canada