korean english


Home > 게시판 > 세미나

아래와 같이 콜로퀴움을 개최하오니 많이 참석해 주시기 바랍니다.

4시 20분부터 제1과학관 31214 e+강의실에서 다과를 준비하오니 많은 참석 부탁드립니다


아 래


제목: Study of carrier transport and charging effects in organic devices


연사: 임   은   주 교수님 (단국대학교 응용물리학과)


일시: 2011년 11월 16일(수) 오후 4:30


장소: e+첨단강의실 (31214호실)


초록: There are many reports on thin film transistors using organic and polymeric semiconductors because of their potential applications such as low-cost memory cards, smart price tags and labels [1]. However, understanding of the driving mechanism, especially degradation characteristics and carrier motion are still not sufficient [2]. For practical applications of organic field effect transistors (OFETs), the presence of defects in the active layer is a serious problem. In this study, we investigated the carrier transport in OFETs, and discussed the charging effects that result in degradation by prolonged electrical stress. The stability of OFET depends critically on defects [3,4]. To clarify the carrier behavior in the OFET channel, we investigated the carrier transport and charging effects in the OFETs by using electric field induced optical second harmonic generation (SHG), Raman and so forth. The EFISHG probes the space charge field distribution in the pentacene FET channel, and visualize carrier motions therein [5,6]. To understand the effect of defects on the carrier transport, Raman spectroscopy and electrical capacitance-voltage measurements were employed. Raman measurement evidently shows structural deformations as well as chemical changes in molecular level [7,8]. With taking into account these, carrier injection process followed by carrier accumulation at the Polyimide/TIPS-pentacene interface has also been investigated by using time-resolved SHG (TR-SHG) measurements. Fresh samples of double layer ITO/Polyimide/TIPS-pentacene/Au devices showed the rapidly increase of the EFISHG by charging onto Au electrode, followed by the decay due to the succeeding hole injection to the TIPS-pentacene. On the other hand, aged samples only showed the increase of SHG signal by electrode charging. These results suggested holes were prohibited from injection after aging [9]. As mentioned above, to study charging effects by using TR-SHG, Raman etc., are very helpful in terms of device operation and degradation.


번호 제목 날짜 조회 수
공지 <12/8(Thu.) 11:00am>노벨상 소개 강연 - 2016년 노벨 물리학상: 위상 응집 물리의 탄생 2016.11.28 1029825
602 <10/28>Grazing Incidence X-ray Diffraction and Surface X-ray Scattering Study of Hematite (α-Fe2O3) Nano-cube 2011.10.26 109891
601 <11/5> Modified nucleic acid systems for biomedical applications 2010.11.01 109853
600 <Nov.13(Fri) 16:00> Kondo screening in mixed valence and heavy fermion compounds and the signatures of Nozieres’ exhaustion 2015.11.04 109593
599 <10/17> Graphitic Carbon Nanostructures 2008.10.27 109583
598 <3/19> Bioconjugates of nanomaterials for biochip & biosensor applications 2010.03.16 109215
597 <3/31> ZnO nanorod heterostructures and nanodevices 2006.03.27 109177
596 <1/28> Steps towards a non-relativistic AdS/CFT 2010.01.25 109041
595 <8/5>Brane superpotential via local Calabi-Yau spaces 2009.08.03 109001
594 2018학년도 1학기 콜로퀴움 일정 2018.01.03 108829
593 <4/21> Experimental and Observational Astrophysics in the Infrared Wavebands 2009.04.17 108073
592 <5/14> Search for exotic materials: strongly correlated electron system 2010.05.10 108073
591 <5/21> Magnetism and Superconductivity 2014.05.14 106772
590 2017학년도 2학기 콜로퀴움 일정 2017.07.04 105740
589 2014학년도 2학기 콜로퀴움 일정 2014.09.11 104807
588 <3/26> Fractional Hall Physics of Epitaxial Graphene: 2010.03.19 104489
587 <7/28> NQR/NMR study on a single crystal of LiFeAs 2010.07.20 103727
586 <3/12(화)>물리학과 특별초청강연 개최 안내 2013.03.04 103615
585 <10/15> How can population pyramids be used to explore the past? 2010.10.14 103455
584 <6/8> 액체금속 및 물의 과냉각 현상과 국소구조와의 관계 : 정전기 공중부양 기술 및 dynamic diamond anvil cell 2011.06.07 103175
583 <5/27(수) 오후4:30분>Controlling phases in epitaxial transition metal oxide thin films 2015.05.21 102818