Home > 게시판 > 세미나
아래와 같이 콜로퀴움을 개최하오니 많이 참석해 주시기 바랍니다.
4시 20분부터 제1과학관 31214 e+강의실에서 다과를 준비하오니 많은 참석 부탁드립니다.
Title: Grain boundary effect in Metal : A journey of discovery from crystal to thin films without grain boundaries
Speaker: Prof. Se-Young Jeong ( Department of Cogno-mechatronics Engineering, Pusan National University )
Date & Time: Sep. 23 (Wed.) 2015, 4:30 PM
Place: Natural Science 1, Room No. 31214
Abstract: It is well known that the resistivity of a metal is governed by electron–phonon scattering at room temperature, and by electron-impurity scattering at low temperatures. However, questions remain regarding the quantitative grain-boundary (GB) effect on the resistivity at room temperature. Upon examination of metal single crystals, we determined the degree to which the resistivity of the metal could be reduced by the elimination of the GB effect. Moreover, the resistivity continued to decrease, finally reaching its minimum value with successive iterations of GB reduction. Our results indicated that this approach works not only in bulk single crystals but also in thin films.
Radio-frequency (RF) sputtering usually produces polycrystalline films with numerous GBs. However, we developed a new method to grow a thin metal film without GBs; the resulting film quality was comparable to that produced using molecular beam epitaxy (MBE). This proposed technique also enables the fabrication of micro/nano-mesh structures of Cu electrodes on polyimide substrates for flexible, transparent conducting electrode (TCE) fabrication via ultraviolet (UV)-lithography and wet over-etching techniques.
Copper may potentially provide an advantage over silver; however, many questions remain with regard to revealing its full potential. Single crystal study may resolve these questions and those related to new materials yet to be discovered. Thus, a great adventure opens up, as we continue to explore the world of single crystals.
|공지||2022학년도 1학기 콜로퀴움 일정||2022.01.10||28039|
|공지||<12/8(Thu.) 11:00am>노벨상 소개 강연 - 2016년 노벨 물리학상: 위상 응집 물리의 탄생||2016.11.28||973869|
|460||<April. 6(Wed.) 4:30 PM> Quantitative Determination of High Tc Superconductivity Mechanism||2016.03.31||95174|
|459||<March. 30(Wed.) 4:30 PM> Tetraneutron (four-neutron nucleus)||2016.03.24||61722|
|458||<March.24(Thu) 14:00> A new boson and muon g-2||2016.03.17||59751|
|457||<March. 23(Wed.) 4:30 PM> 조선시대의 천문시계||2016.03.17||54557|
|456||<March.18(Fri) 11:00> High Pressure Synthesis and Characterization of Non-Oxide Superconductors||2016.03.14||62078|
|455||<March. 16(Wed.) 4:30 PM> 초고속반도체의 블랙다이아몬드™,low-k||2016.03.10||64194|
|454||<March. 9(Wed.) 4:30 PM>가치 있는 대학 생활이란 무엇인가?||2016.03.07||53944|
|453||<March 8(Tue) 18:00> Unsolved puzzles of Gamma-Ray Bursts||2016.03.03||60983|
|452||2016학년도 1학기 콜로퀴움 일정||2016.02.03||130933|
|451||<Dec.30(Wed) 16:30> Some basics about the thermoelectricity; the semi-classical Boltzmann transport approach||2015.12.24||61941|
|450||<Dec. 9(Wed.) 4:30 PM>Direct detection of dark matter at Underground||2015.12.03||69408|
|449||<Dec. 2(Wed.) 4:30 PM> Next-generation solar cells for high photo-conversion efficiency||2015.11.25||86095|
|448||<Nov. 25(Wed.) 4:30 PM> Present and Future of OLED||2015.11.19||69715|
|447||<Nov. 18(Wed.) 4:30 PM> Single-molecule chemistry and spectroscopy on ultrathin insulating films||2015.11.11||92411|
|446||<Nov. 11(Wed.) 4:30 PM> 그래핀 산업의 현황과 전망||2015.11.09||60571|
|445||<Nov.13(Fri) 16:00> Kondo screening in mixed valence and heavy fermion compounds and the signatures of Nozieres’ exhaustion||2015.11.04||91107|
|444||<Nov. 4(Wed.) 4:30 PM> 기능성 산화물과 그래핀을 접합한 나노소자의 특성 변화||2015.10.30||58231|
|443||<Oct.20(Tue) 10:00-12:00> Novel quantum transport in Weyl semimetals and double-Weyl semimetals||2015.10.23||72054|
|442||<Oct. 28(Wed.) 4:30 PM> Anomalous diffusion of single-molecules in living cells: at the interface of biology and statistical physics||2015.10.19||80095|
|441||<Oct.20(Tue) 16:00> Electromagnetic Response and Thermomagnetic Instabilities in Three-Dimensional Nanostructured Superconductors||2015.10.15||76248|