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||<12/8(Thu.) 11:00am>노벨상 소개 강연 - 2016년 노벨 물리학상: 위상 응집 물리의 탄생||2016.11.28||1078519|
|665||<9/20> Time-reversal anomaly in Josephson effect involving Majorana fermions||2012.09.20||205068|
|664||<Nov. 16(Wed.) 4:30 PM> Two-dimensional Chiral Materials and Topological Insulators||2016.11.10||200719|
|663||<11/26(수)> Neutrino Physics with KamLAND||2014.11.20||199428|
|662||<10/31> Large-Scale Quantitative Analysis of Painting Arts||2012.10.18||199362|
|661||<11/21> Cosmological viable scalar-tensor theories of gravity||2012.11.16||198624|
|660||<Oct. 7(Wed.) 4:30 PM> Observing Ultra High Energy Cosmic Rays with your Smartphone||2015.10.02||197405|
|659||<Dec. 1(Wed.)>Halide Perovskite Single Crystals and Thin Films for Solar Cells and Optoelectronics||2021.11.25||194521|
|658||<May. 25(Wed.) 4:30 PM> Functional Materials @ Nanoscale: Electronics, Energy and ‘Green’Healthcare Applications||2016.05.23||186070|
|657||<12/20(Thu) 2:00pm> Gravitating Spinning Stars (a particle theorist's perspective)||2018.12.17||183722|
|656||<Nov. 18(Wed.) 4:30 PM> Single-molecule chemistry and spectroscopy on ultrathin insulating films||2015.11.11||182761|
|655||<12/4> Shining light on the dark Universe||2013.11.29||182129|
|654||<3/13> Probing hidden magnetism and quantum criticality in unconventional superconductors||2009.03.06||181820|
|653||<4/18(금)> 양자물질초전도체창의연구소 초청 세미나||2014.04.15||178471|
|652||<Feb.18(Thu.)> Hund's metallicity in the vicinity of a Van Hove singularity / Correlated topological phases in strongly correlated heterostructures||2021.02.16||177709|
|651||<4/2> Radio Detection of Ultra High Energy Cosmic Rays and Neutrinos in Antarctica||2014.03.26||177461|
|650||<8/20> Radioprotection effect and anti-tumor immunity by TCM-EF in mice||2013.08.21||177242|
|649||<12/5> Fluerenes with diversed structures and their applications||2008.12.02||172140|
|648||<11/7> On-Film Formation of Bi Nanowires with Extraordinary Electron Mobility||2008.11.03||169638|
|647||<9/19> Downscaling of self-aligned, all-printed polymer thin-film transistors||2008.09.16||166580|
|646||<6/2> The black hole search at the LHC: critical comment||2011.06.01||164615|