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미래를 창조하는 포스텍 화학공학과
Design and Processing of Solution-Processed Amorphous Oxide Electronic…
- 일자
- 2016.12.14(수)
- 시간
- 4:30pm
- 연사
- Prof. Myung-Gil Kim & Sunjoo Kim
- 장소
- RIST 3동 3326호
- 소속
- Chung-Ang University
Design and Processing of Solution-Processed Amorphous Oxide Electronics
The flat panel display and thin-film solar cell are the most successful examples of large area electronics. This rapidly emerging technology expands to diverse new directions, for example, transparent flexible/stretchable displays, radio-frequency identification (RFID) tags, conformal sensor arrays, and high efficiency solar cells. To be maximally useful, large area electronics require high performance electronic materials, cost-effective fabrication processes, facile scaling up of substrate size, and new functionality.
Solution processed amorphous metal oxide electronics could potentially meet the requirements of commercial large area electronics, such as high-throughput fabrication processes and a choice of materials with appropriate electrical performance characteristics. However, this area still faces several challenges, such as low performance, high annealing temperatures, and the inability to fine-tune intrinsic properties. An intensive study of interface optimization, novel fabrication concepts, and new materials deve1lopment can addresses critical issues in solution processed metal oxide electronics. In this talk, I will present that new material designing principle and processing concepts afford the development of high performance amorphous metal oxide semiconductor. Also compared to the high processing temperature (Tanneal > 400oC) of conventional sol-gel precursors, the low temperature processable novel precursor design concepts of oxoclusters and photochemical activation process dramatically reduce the processing temperature as low as 100 oC. Overall, the significant progresses of material, precursor and processing concept could bring the next generation large area electronics into our daily life earlier than our expectation.
Charge transport properties and electronic applications of pi-conjugated polymers
Conjugated polymers have unique charge-transport properties different from inorganic counterparts. In order to make the best use of their capability as desired, one needs to understand electron-transporting phenomena in molecular systems and factors that influence the charge-carrier dynamics. In this talk, I describe our recent work investigating how the charge-transport properties can be engineered in a molecular scale and how we can utilize this approach for developing high-performance electronic components. The first part covers molecular engineering for charge transport in a series of polymer semiconductors having extended the pi-conjugation and its electronic applications. As an extension of work on n-type polymers, interfacial engineering was applied and the changes in transport properties and device characteristics were studied. The next part describes intentional utilization of inherent charge-trapping phenomena for nonvolatile memory devices based on an n-type polymer. By taking the advantages of charge trapping in n-channel devices, good memory performance was achieved without any additional charge-storage agents. Finally, I will present our work on polymer composites with tuning of electrical conductivity through doping-state control and post-processing. The highly conductive polymer composites are potentially useful for development of transparent electrodes for display elements and solar cells as well as energy conversion and storage systems.
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