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    미래를 창조하는 포스텍 화학공학과

    Solution-based Thin-film Formation of Carbon and Organic Materials for…

    일자
    2017.06.21(수)
    시간
    14:00
    연사
    Steve Park
    장소
    환경공학동 111호
    소속
    KAIST
    The field of electronics is entering into a new era with new and exciting applications such as wearable electronics, flexible electronics and optoelectronics, and implantable bioelectronics. Being competitive in these markets will require manufacturing of devices with competitive cost and performance. In this talk, I will discuss solution-based thin-film formation of single-walled carbon nanotubes (SWNTs) and organic materials to fabricate low-cost electronics and sensors with enhanced performance. To process thin-film of SWNTs as channel material in transistors, two main challenges exist—elimination of metallic SWNTs and dense alignment of SWNTs. To address the former, I have developed a polymer-based sorting technique that was shown to selectively disperse semiconducting SWNTs with a narrow diameter range of 0.8-1 nm. The address the latter, I have developed solution shearing technique to densely align SWNTs over a large area in a facile manner with density as high as 200 tubes/micron. Also using SWNTs, stretchable capacitive tactile sensor was fabricated with high sensitivity of 0.7 kPa-1 and with the ability to differentiate between different tactile inputs. To print thin films of small organic molecules, a technique known as CONNECT was developed where organic crystals were aligned, self-patterned, and self-registered within the transistor channel over a large area. Transistor density as high as 840 dpi with low relative variance of 26% were demonstrated, along with a 2-bit half adder circuit. Finally, using ferroelectric polymer, PVDF, implantable microphone was fabricated, which was inserted into the cochlea to measure intracochlear sound pressure. In summary, the performance of SWNTs and organic thin films have been enhanced through novel solution processing techniques, through which transistors and various sensors were fabricated.