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1. 일 시 : 2012. 9. 4 (화), 16:00 ~
2. 장 소 : 응용공학동 1층 영상강의실
3. 연 사 : 김상우 교수 (성균관대학교 신소재공학부)
4. 제 목 : Piezoelectric Nanogenerators and Piezotronics for Energy and Optoelectronic Device
Nanopiezotronics is an emerging area of nanotechnology with a variety of applications that include piezoelectric field-effect transistors and diodes, self-powered piezoelectric power generator (nanogenerator), and wireless nano/biosensors. By exploiting coupled piezoelectric and semiconducting characteristics, it is possible for nanowires, nanobelts, or nanorods to generate rectifying current and potential under external mechanical energies such as body movement, muscle stretching, vibrations, and hydraulic forces. Various energy harvesting systems can be designed and developed based on the different physical mechanisms of each energy generator. I will present a flexible hybrid architecture designed to harvest mechanical and solar energies, either separately or simultaneously. By using ZnO with intrinsically coupled piezoelectric and n-type conductive properties, a flexible hybrid energy scavenger is naturally created without any crosstalk and an additional assembling process, thus totally differing from a simple integration of two different energy generators. The piezoelectric output signals from our hybrid cells are originally alternating current (AC) type, but they can be controlled to direct current (DC)-like type by tailoring mechanical straining processes both in a dark and under a light illumination. Based on such controllability of a piezoelectric output behavior, the performance of the hybrid cell is synergistically enhanced by the contribution of piezoelectric generator, compared with the output power generated independently from the solar cell part under normal indoor level of illumination.