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Phase patterning for ohmic homojunction contact in MoTe<sub>2</sub>
Cho, Suyeon,Kim, Sera,Kim, Jung Ho,Zhao, Jiong,Seok, Jinbong,Keum, Dong Hoon,Baik, Jaeyoon,Choe, Duk-Hyun,Chang, K. J.,Suenaga, Kazu,Kim, Sung Wng,Lee, Young Hee,Yang, Heejun American Association for the Advancement of Scienc 2015 Science Vol.349 No.6248
<P><B>Making better contacts</B></P><P>A key issue in fabricating transistors is making a good electrical contact to the semiconductor gate material. For two-dimensional materials, one route is through a phase transition that converts a hexagonally packed semiconductor phase into a distorted octahedrally packed metallic phase. Cho <I>et al.</I> show that laser heating of molybdenum telluride (MoTe<SUB>2</SUB>) achieves this conversion through the creation of Te vacancies. The phase transition improves charge carrier mobility while maintaining the low resistance necessary for improved transistor function.</P><P><I>Science</I>, this issue p. 625</P><P>Artificial van der Waals heterostructures with two-dimensional (2D) atomic crystals are promising as an active channel or as a buffer contact layer for next-generation devices. However, genuine 2D heterostructure devices remain limited because of impurity-involved transfer process and metastable and inhomogeneous heterostructure formation. We used laser-induced phase patterning, a polymorph engineering, to fabricate an ohmic heterophase homojunction between semiconducting hexagonal (2H) and metallic monoclinic (1T’) molybdenum ditelluride (MoTe<SUB>2</SUB>) that is stable up to 300°C and increases the carrier mobility of the MoTe<SUB>2</SUB> transistor by a factor of about 50, while retaining a high on/off current ratio of 10<SUP>6</SUP>. In situ scanning transmission electron microscopy results combined with theoretical calculations reveal that the Te vacancy triggers the local phase transition in MoTe<SUB>2</SUB>, achieving a true 2D device with an ohmic contact.</P>
Mitrofanovite, Layered Platinum Telluride, for Active Hydrogen Evolution
Suyeon Cho(조수연) 한국고분자학회 2021 한국고분자학회 학술대회 연구논문 초록집 Vol.46 No.1
Two-dimensional (2D) layered catalysts have been considered as a class of ideal catalysts for hydrogen evolution reaction (HER) because of their abundant active sites with almost zero Gibbs energy change for hydrogen adsorption. Despite the promising performance, the design of stable and economic electrochemical catalyst based on 2D materials remains to be resolved for industrial-scale hydrogen production. We studied layered platinum tellurides, mitrofanovite Pt<sub>3</sub>Te<sub>4</sub>, which serves as an efficient and stable catalyst for HER together with a high current density exceeding 7000 mA/cm<sup>2</sup>. Theoretical calculations exhibit that Pt<sub>3</sub>Te<sub>4</sub> with numerous edges shows near-zero Gibbs free-energy change of hydrogen adsorption, which shows the excellent HER performance as well as the extremely large exchange current density for massive hydrogen production.
조수연(SuYeon Cho),김일곤(Ilkon Kim),조훈(Hune Cho),곽연식(YunSik Kwak) 한국정보과학회 2003 한국정보과학회 학술발표논문집 Vol.30 No.2Ⅱ
환자 진료 의뢰 과정은 1차 진료기관에서 3차 진료기관으로 환자 진료를 의뢰하고 3차 진료기관에서 검사, 처방, 입원 등의 진료행위를 하고 환자가 3차 병원을 나갈 때 퇴원요약정보를 1차 진료기관으로 다시 보내준다. 이러한 퇴원 요약 시스템은 병원간 환자 정보의 공유를 통해서 환자의 회복과 질 높은 의료 서비스를 제공할 수 있게 한다. 방사선과 정보가 다른 퇴원 요약 정보와 함께 제공된다면 지속적이고 일관된 의료 서비스의 제공에 도움이 된다. 또한 방사선과의 경우 3차 진료기관에서 이미지를 획득할 수 없는 경우, 이미지 획득 장비를 갖춘 1차 진료기관으로 진료 의뢰를 해야 하는 특수한 상황도 발생하는데, 이를 역진료의뢰라고 한다. 우리는 이러한 방사선과의 특성을 함께 고려한 방사선과 정보를 지원하는 퇴원정보요약시스템을 제안한다.
가속 능력을 고려한 주행 집전계 시험기 주행대차용 선형 유도전동기 설계에 관한 연구
조수연(Suyeon Cho),김광수(Kwangsoo Kim),이형우(Hyungwoo Lee),함상환(Sanghwan Ham),안한웅(Hanwoong Ahn),이주(Ju Lee) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
This paper presents design process of linear induction motor in dynamic tester for catenary-current collection. To minimize length of rail for dynamic tester for catenary-current collection, accelerating performance of the linear induction motor is very important. So the design process of linear induction motor considered in this paper is different with general design process of linear induction motor, because dynamic tester has three type driving region, as accelerating region, constant speed region, and braking region. Considering accelerating performance of motor, distance and time from starting point to constant speed region were concerned for load condition of motor. Designed linear induction motor was analyzed by 2-dimensional finite element method. Using mechanical dynamics simulation with analysis result of 2-dimensional finite element method, accelerating performance of designed motor was proved.
Newton법을 이용한 IPMSM의 고정자 저항 고려 최대 출력 제어
조수연(Suyeon Cho),김승주(Seungjoo Kim),함상환(Sanghwan Ham),유광현(Gwanghyeon Ryu),안한웅(Hanwoong Ahn),이주(Ju Lee) 한국자동차공학회 2011 한국자동차공학회 부문종합 학술대회 Vol.2011 No.5
This paper presents maximum power control of IPMSM for EV/HEV. Conventional maximum power control of IPMSM approximated the stator resistance. This common assumption was allowed to high-voltage and low-current type motor. But, since IPMSM for EV/HEV have low voltage source and large current capacity, the lack of control voltage is caused by the assumption of stator resistance. And it makes nonlinear characteristics of the motor control, especially overmodulation in PWM inverter. So it needs to consider voltage drop between the stator resistance. In this paper, voltage equation including the stator resistance was used for the maximum power control of IPMSM. For solving complexities of this equation, Newton method was used. Finally, the proposed method was verified to compare with the conventional method by matlab/simulink simulation results.