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Z11.08 - Processing of Conducting Polymer Thin Films for Organic Electrochemical Transistors 
April 25, 2014   10:15am - 10:30am

Organic bioelectronics deals with the coupling of devices based on conducting polymers with biological systems and underpins new technologies, such as implantable electrodes, biosensors and drug delivery systems. Organic electronic materials exhibit mixed conduction: they can transport not only electronic charge carriers but also ions. As such, they offer a suitable interfacebetween the worlds of solid-state electronics, which use electronic charge carriers, and biology, where signals generally consist of ionic currents.Among the most common examples of organic bioelectronics devices are organic electrochemical transistors (OECTs). OECTs are able to operate in aqueous solutions at low voltages (< 1 V). They have been used as sensors for hydrogen peroxide, glucose, dopamine, chloride ions, and bacteria. Despite the impressive progress in the field of OECTs, the interrelationships between the chemical composition/morphology of the polymer transistor channel and the transistorelectrical characteristics are still largely unexplored. In our group we are developping OECTs where the chemical composition and the morphology of the conducting polymer channel is tailored to achieve: i) high current modulation at low operating voltage (ideally 2-3 current decades below 100 mV), and ii) reversibility of the doping/dedoping process taking place upon application of an electrical bias. Such characteristics will improve the ability of OECTs to respond to external stimuli and to reversibly incorporate specific molecules. To achieve this objective, we employed several thin film processing techniques. In particular, we explored spin coating, a combination of screen-printing and vapour phase polymerization and inkjet printing.By varying the film deposition technique, we are able to obtain films with different morphologies and chemical compositions, which result in different doping/dedoping characteristics. Our work provides new insights on the role of film processing on device performance and offers unprecedented opportunities to clarify the OECT operating mechanism.

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Keynote Address
Panel Discussion - Different Approaches to Commercializing Materials Research
Business Challenges to Starting a Materials-Based Company
Fred Kavli Distinguished Lectureship in Nanoscience
Application of In-situ X-ray Absorption, Emission and Powder Diffraction Studies in Nanomaterials Research - From the Design of an In-situ Experiment to Data Analysis