Organic field-effect transistors (OFETs) have gained enormous research interest in a number of applications such as flexible displays, radio frequency identification, chemical and biological sensors. The carrier mobility of organic semiconductor materials is one of the key parameters to assess the quality and performance of a semiconductor material before utilizing a newly developed semiconductor material for specific applications. Polymeric OFETs have gained considerable attention owing to the long-term stability, low operating voltages, solution processability and low preparation cost in the development of organic electronics. Current development of organic electronics involves processing and characterization techniques in broad areas ranging from chemistry, physics, electronics to engineering. To measure the electronic properties of an organic polymeric semiconductor material, transistor-based devices were fabricated using conjugated polymers as the active semiconductor material. Such devices may consist of multiple thin layers of materials within several to hundred nanometers thick. They include the active semiconductor layer, the dielectric layer, self-assembled monolayers, and the source, drain, gate electrodes on a substrate. The quality of each deposited layer may greatly affect the overall performance of an OFET device. Therefore, the quality control of each individual layer is an important aspect in OFET fabrication and organic electronics research.
This presentation aims to provide a brief introduction to different nano-processing techniques such as photolithography, spin-coating, thermal evaporation, surface modifications, and polymerization techniques of conjugated polymers. Special emphasis will be focused on OFET fabrication techniques, design of polymeric semiconductor materials and optimization of OFET device performances. By the end of the presentation, it is expected that the audience will be able to understand the basic principles of organic semiconductors and field-effect transistors, in which such technology may lead to a number of novel and innovative smart electronic devices or applications in the future.
Bio: Jenner H.L. Ngai is currently pursuing his PhD (Nanotechnology) in synthesis of conjugated polymers used in chemical and biological sensing under the supervision of Prof. Yuning Li in the Department of Chemical Engineering in The University of Waterloo (UW). He received his BSc in Chemistry in The Chinese University of Hong Kong (CUHK) and MPhil in Chemistry in The Hong Kong Baptist University (HKBU). He is currently working on an “indigo-dye” based polymeric semiconductor used for anion sensing, and a chemiresistive polymer conductor for chemical and volatile organic solvent (VOC) sensing.
200 University Ave West
Waterloo, ON N2L 3G1