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        • 정교화된 베케-존슨 교환 포텐셜 모델 기반의 제일원리 시뮬레이션을 통한 인장력이 가해진 Si<SUB>1-x</SUB>Ge<SUB>x</SUB>의 물성 분석

          이해창(Lee Haechang),조용범(Yongbeom cho),정영훈(Yung Hun Jung),조성재(Seongjae Cho) 대한전자공학회 2018 대한전자공학회 학술대회 Vol.2018 No.6

          In recent days, there have been efforts to employ Ge into Si for improved electrical and optical performances. In particular, as one of the functional materials for CMOS extension, Ge is gaining popularity, which is explicitly revealed in the most recent semiconductor technology roadmaps. Tensile strain on Si is intentionally scheme by employing Ge atoms into the Si matrix for higher carrier mobilities. In this study, a series of atomic-level simulations have been conducted in consideration of the modified Becke-Johnson (mBJ) model for extract the bandgap energies and tensile strains in the SiGe alloy. It is found that the determination of conduction band minimum is turned from △valley to L valley at 77.5% of Ge fraction in the SiGe alloy. Further study demonstrates that SiGe under proper amount of tensile strain transits from indirect-bandgap material to direct-bandgap one.

        • KCI등재

          SiGe을 소스 접합 물질로 사용하는 터널링 전계효과 트랜지스터의 성능 및 짧은 채널 효과 분석

          정영훈(Yunghun Jung),조용범(Yongbeom Cho),강인만(In Man Kang),조성재(Seongjae Cho) 대한전자공학회 2017 전자공학회논문지 Vol.54 No.12

          본 논문에서는 Si 기반의 터널링 전계효과 트랜지스터(tunneling field-effect transistor, TFET)의 낮은 전류 구동 능력을 향상시키기 위해 소스 접합에 Si1-xGex을 적용한 이종접합 기반의 Si1-xGex 터널링 전계효과 트랜지스터의 성능을 분석하고 주어진 소자에서 나타날 수 있는 짧은 채널 효과(short-channel sffects)의 양상을 살펴본다. Ge 함량(x)의 변화에 따른 소스 접합물질의 에너지 밴드갭 변화와 에너지 자리 밀도(density of states)의 변화의 결과로 나타나는 켜진 상태 전류의 변화에 초점을 두어 분석을 수행하였다. 더불어, 향후 10 nm 이하 기술 노드(technology node)에서의 소자 적용 가능성을 확인함과 동시에 짧은 채널에서 나타나는 비이상적인 효과들을 살펴보기 위해 채널 길이(Lch)를 28 nm, 14 nm, 10 nm, 7 nm로 변화시키면서 시뮬레이션을 수행하였다. Lch이 짧아질수록 소스와 드레인 간의 전기장의 겹침으로 채널의 일부 영역에서 인해 펀치스루 (punch-through) 현상이 발행하여 TFET의 스위칭 특성이 열화되는 것을 확인하였다. 나아가, Lch의 변화에 따른 고속 동작특성 변화를 확인하기 위해 fT 및 fmax를 추출하였으며 Lch가 짧아질수록 단조증가하는 경향을 확인하였다. In this paper, we present the device performances of Si1-xGex heterojunction tunneling field-effect transistor (TFET) having Si1-xGex source junction specifically designed for improving the rather low on-state current (Ion) of Si TFET and have a look into the short-channel effects (SCEs) which might take place in the device. The analyses are performed with a focus on the relation between Ge fraction (x) and Ion under the influences of changes in energy bandgap and density of states (DOS) in the Si1-xGex source junction as a function of x. Also, in order to evaluate the possibility of application of the Si1-xGex TFET to the upcoming sub-10-nm technology nodes and the non-ideal effects arising from the extremely short-channel TFETs simultaneously, the device simulations were performed with scaling the channel length: 28 nm, 14 nm, 10 nm, and 7 nm. It is confirmed that the switching characteristics of Si1-xGex TFET are degraded as Lch is shrunken, due to the electric field overlap between source and drain in a part of channel leading to punch-through. Furthermore, in order to investigate the high-speed operation characteristics, fT and fmax were extracted from the devices with different Lch’s and it was verified that those parameters maintained the tendency of increase as Lch gets shorter.

        • 바이오경제시대 과학기술정책의제 연구사업(8차년도) - 제2권: 면역항암제 개발 동향과 시사점 -

          김석관(Seok-Kwan Kim),박수영(Sooyoung Park),신예린(Yerin Shin),조용범(Yongbeom Cho),신춘봉(Chun-Feng Xin),도준상 과학기술정책연구원 2019 정책연구 Vol.- No.-

          In the field of cancer treatment, the progress of immunotherapy has been impressive over the past decade, and the paradigm of cancer treatment is at a turning point. Cancer immunotherapy, called third-generation anticancer drugs, are drugs that cause immune cells to directly kill cancer cells by regulating or enhancing immune cell functions in the body. It overcomes the limitations of the first generation chemotherapy and second generation target therapy. The incredible success of curing the intractable cancer patients is raising hopes that humankind may conquer cancer and opens up new market opportunities for pharmaceutical companies and start-ups. However, research and development in the field of immunotherapy were not actively pursued in Korea and policy responses are lacking. The major reason for this is that the scale of cancer immunotherapy is small, but the technical barriers to understanding cancer immunotherapy are high, suggesting the lack of a policy debate. Therefore, in order to move policy and strategic discussions about cancer immunotherapy forward more actively, a research report about current trends is necessary. This should include easy-to-understand technical explanations enabling non-experts to understand them easily. The purpose of this research is to explain the basics of cancer immunotherapy and to provide the latest information on emerging trends in cancer immunotherapy. Cancer immunotherapy can be divided into several subdivisions, and each category is complex when it comes to the technical details. Therefore, in this research, we focus on two areas that are receiving the greatest attention in recent years, "immune checkpoint Inhibitor’ and ‘CAR-T immunotherapy’ The content of this research is structured as follows. Chapter 1 explains the background, necessity and purpose of the study. The historical development of cancer therapy and the subsequent rise of cancer immunotherapy are briefly mentioned. Chapter 2 explains the possibility of immuno-chemotherapy through providing a basic understanding of the immune system in the context of anti-cancer immunity. In addition, the scope of the cancer immunotherapy analyzed in this study is outlined. Chapters 3 and 4 contain a review of basic mechanisms, outcomes, limitations, and global trends of the immune checkpoint inhibitors and the CAR-T immunotherapy, respectively. "Immune checkpoint inhibitors" are the first immunotherapeutic drugs that demonstrate efficacy and are FDA approved. CAR-T, the most promising therapy among various genetic manipulation immunotherapy strategies is mainly described. Chapter 5 suggests policy implications of the emerging cancer immunotherapy trends. In this chapter, we propose ‘biotechnology innovation policy in a broad context’ and ‘strategy for the development of cancer immunotherapy in a narrow context’.

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