Plastic semiconductors incorporated into transistors have shown enormous potential for low-cost, flexible, printable electronics and bioelectronics. In my talk, I will discuss their history, operating mechanisms, and potential applications. I will highlight key challenges to these applications, and discuss some of the approaches I've taken to overcome them. I will show how these simple solutions can work towards the broad realization of organic transistors.

Carbon Based Nano Electromechanics: Physics and Applications

Sang Wook Lee

Department of Physics, Ewha Womans University, Seoul, 03760, Korea

E-mail: leesw@ewha.ac.kr

In this presentation, physical properties and possible applications of carbon based nano electro-mechanical devices

(NEMS) will be introduced. Our research started from carbon nanotube based nano electro-mechanical relay

structure and expanded to graphene-based xylophone and drum like devices. Micro contact transfer method is

applied to realize the suspended nano structures with various electrodes under the nano materials. Recently

developed pick-up and transfer technique made us possible to fabricate various stacking and suspended nano

structures. After introducing some interesting physical properties, such as basic mechanical switching and

resonance behaviour and light emission of suspended graphene structures, possible application of carbon based

nano electro-mechanical devices will be suggested. Graphene based ultra-sensitive mass detector will be suggested

for one of the promising applications of our devices and our recent research project on single protein sequencing

using graphene-based mass detector will be introduced at the end of presentation.

Although in recent years researchers have committed significant efforts investigating properties and potential functionalities of metal oxides, commercially available oxide-based devices still
remain quite limited. Reasons for this include high material costs, sophisticated/non-scalable growth techniques, and insufficient enhancements over current industry standards. Our aim is
to narrow the divide that separates fundamental research and functional applications by developing efficient synthesis methods for strategic materials that will be highly impactful on
society. In particular we have identified tungsten oxide owing to its large abundance, optical bandgap, and versatile physical properties as an ideal candidate for photocatalytic hydrogen
production which has potential to provide a positive paradigm shift in society’s demand for fossil fuel generated energy, especially in developing portions of the world. Here I will discuss two
parallel approaches towards synthesizing tungsten oxide nanostructures that are cost effective, time efficient, and scalable along with their morphology, crystallinity, electronic properties, and
potential for utilization in functional devices.