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- [Alumni] 정현석교수님 연구실 공오영 연구원, 해외 박사후연구원 (GPF) 연수후기
- 글 : 공오영 1. 연수 개요 저는 성균관대학교에서 학사, 석사, 박사과정을 수행하였으며, 신소재공학과 정현석 교수님의 지도를 통해 박사학위를 수여 받은 공오영입니다. 학위과정 동안 차세대 페로브스카이트 유연 태양전지의 결함제어를 주제로 연구하였으며, 이어서 BK21 2024 해외 박사후연구원 (Global Postdoctoral Fellowship) 지원사업을 통해 세계적인 연구기관인 매사추세츠 공과대학교 (Massachusetts Institute of Technology, MIT)에서 2024년 3월부터 1년간 공동연구 연수를 수행할 기회를 가졌습니다. MIT는 혁신적인 연구와 창의적인 학문 환경으로 유명한 곳이며, 본 연수를 통해 학문적 역량을 심화하고 국제적인 협업의 기회를 경험할 수 있었습니다. 그림 1 . 매사추세츠 공과대학교 캠퍼스 중심의 맥클로린 빌딩 [연수자 본인 촬영] 2. 연구 활동 재료공학 박사로서 다양한 반도체 소재 연구를 통해 에너지 생산 반도체 소재와 기능성 반도체 소재의 융복합 기술 개발을 목표로 연수기간 동안 저는 MIT의 김지환 교수님 연구실에서 차세대 2차원 반도체 소재와 관련된 연구를 수행하였습니다. MIT의 김지환 교수님 연구팀은 다양한 2차원 소재 및 차세대 전자 소자에 대한 연구를 다수의 기관 및 기업들과 협업을 통해 소재 및 공정 기술 난제들을 극복하여 세계적인 최정상급의 연구 결과들을 지속하여 도출하고 있습니다. 학위과정 동안 습득한 결함제어 및 고성능 소자 제조 공정 기술들을 기반으로 김지환 교수님 연구팀에 합류하여 기존 소재 및 공정의 한계를 논의하고 함께 해결해 나가는 연구를 수월하게 진행할 수 있었습니다. 3. 연구 환경 및 협업 MIT는 연구자들에게 최적의 환경을 제공하는 곳으로, 실험실 시설과 연구 지원 시스템이 매우 체계적입니다. 특히, MIT에서 관리하고 유지 보수되는 세계 최대 규모의 클린룸은 환경과 먼지에 민감한 나노 소재의 공정 및 분석에 매우 적합한 환경으로 조성되어 있습니다. 또한, 다양한 분야의 교수와 연구자들은 적극적으로 의견을 나누고 협업하는 분위기를 조성하여 연구의 질을 향상시키는 데 큰 도움이 되고 있습니다. 그림 2. 매사추세츠 공과대학교의 대형 클린룸 [mitnano.mit.edu] 4. 개인적 성장 및 경험 이번 연수를 통해 학문적 성장뿐만 아니라 개인적으로도 많은 발전이 있었습니다. 새로운 환경에서 연구를 수행하며 문제 해결 능력을 키웠고, 다양한 국적의 연구자들과 협력하면서 글로벌 연구 네트워크를 구축할 수 있었습니다. 또한, MIT의 혁신적인 연구 문화와 창의적인 사고방식을 직접 경험하며 앞으로의 연구 방향을 더욱 구체화할 수 있었습니다. 5. 향후 계획 본 연수에 이어 2025 SKKU President Fellowship에 선정되어 MIT에서의 연구를 지속해서 수행하며 경험을 심화하고, 국내외 연구자들과 지속적인 협업을 이어 나갈 계획입니다. 또한, 향후 장기 해외 연수를 통해 배운 연구 방법론과 협업 방식 등을 본교 및 국내 연구 환경에 적용하여 연구의 질적 향상을 도모하고자 합니다. 6. 맺음말 해당 연수 덕분에 세계적인 연구기관에서 귀중한 경험을 쌓을 수 있었습니다. 이번 연수는 제 연구 경력에 있어 큰 전환점이 되었으며, 이를 발판 삼아 더욱 발전해 나가고자 합니다. 앞으로도 글로벌 연구 역량을 강화하고, 국내 연구 발전에 기여할 수 있도록 노력하겠습니다. 이 과정에 도움을 주신 모든 분께 진심으로 감사드립니다.
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- 작성일 2025-09-16
- 조회수 320
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- [Alumni] 조형균 교수님 연구실 최지훈 연구원, BK장기해외연수 소감
- [[연수 소감]] 글 : 최지훈 Greetings, I am Jihoon Choi, a graduate student in the 8th semester of the combined master's and doctoral program within the Department of Materials Science and Engineering at Sungkyunkwan University. I had the privilege of serving as a visiting researcher at the University of Pennsylvania (UPenn) in the United States from March 2023 to the end of August 2023, thanks to the BK long-term overseas training program. In this article, I will share my research impressions and insights gained during this enriching experience. Research Focus: My current research revolves around the field of hydrogen production through water splitting using solar energy. During my time at UPenn, I had the opportunity to work alongside Professor Eric A. Stach's group, a renowned electron microscopy research team specializing in the analysis of energy conversion materials. Transmission Electron Microscopy (TEM) Expertise: A key aspect of my training was acquiring expertise in Transmission Electron Microscopy (TEM) and Spherical Aberration Correction Scanning TEM (STEM). TEM analysis plays a pivotal role in materials engineering research, but it is often challenging to access outside specialized laboratories. Through this overseas experience, I spent over 100 hours working directly with TEM, significantly expanding my skill set. Notably, our research focused on in-situ TEM analysis, a technique limited to only a handful of laboratories. We employed a nano-scale 3-electrode chip to facilitate electrolyte flow, enabling us to investigate the growth and stability of nanomaterials through electrochemical reactions within a TEM holder. My work involved capturing images of the nanoparticle catalyst growth process during these electrochemical reactions. Collaborative Efforts: Collaboration was a cornerstone of my overseas experience. I partnered with a postdoctoral researcher from a fellow overseas laboratory within our organization. Together, we undertook a study aimed at achieving a highly uniform distribution of molecular catalysts at the single-atom level on a silicon substrate. Subsequently, we applied machine learning techniques to post-process TEM images, a cutting-edge approach actively explored within recent academic circles, to ascertain the distribution and size of single-atom catalysts. My time at UPenn was invaluable in broadening my scientific horizons. I actively participated in cutting-edge research, leveraged state-of-the-art scientific equipment, attended meetings at renowned university laboratories, and delivered presentations, all of which contributed significantly to my academic and professional growth.
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- 작성일 2023-09-07
- 조회수 4042
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- [Research] Prof. Sunkook Kim's Develops Nanoporus IGZO Applicable to Visible-to-NIR detecting photo transistor
- Prof. Sunkook Kim's (Department of Advanced Materials Science and Engineering) Develops Nanoporus IGZO Applicable to Visible-to-NIR detecting photo transistor Professor Sunkook Kim’s research team (Department of Advanced Materials Science and Engineering) proposed an approach for detecting wide spectral range using indium gallium zinc oxide (IGZO) phototransistors. IGZO phototransistors have limited applicability in broad spectral range detection; to solve this many research had been done using external photo-absorber. Our team developed nanoporous IGZO phototransistors, which can detect near infrared (NIR) without using any absorber. IGZO is optically transparent due to a bandgap of nearly 3–4 eV; thus, to extend the light detection range of IGZO, a laminated approach that introduces secondary materials has been suggested in previous reports. An additional optical absorption layer with a narrower bandgap on the IGZO thin film has been investigated in various studies. These absorption layers include CdSe, CdS, and PbS quantum dots; graphene dots; metal nanoparticles; and films of selenium. Heterojunctions of two-dimensional MoS2, graphene, and perovskite (CsPblxBr3-x) with IGZO films have also been investigated. To solve this problem, Sunkook Kim’s research team investigated the performance of nanoporous IGZO phototransistors. The nanopores throughout the entire thickness of ~ 30 nm in (IGZO) created by block co-polymer lithography. The process of creating a nonporous morphology is sophisticated and is accessed using a wafer-scale phototransistor array. See-through nanopores have edge functionalization with vacancies, which leads to a large subgap states within the conduction band minima and valence band maxima. These subgap states further contribute to detect NIR by employing photogating effect. The performance of the phototransistors is assessed in terms of photosensitivity (S) and photoresponsivity (R); both are of high magnitudes (S = 8.6×104 at ex = 638 nm and Pinc = 512 mW cm⁻2; R = 120 A W⁻1 at Pinc = 2 mW cm⁻2 for the same ex). Additionally, the 7 × 5 array of 35 phototransistors is effective in sensing and reproducing the input image by responding to selectively illuminated pixels. Prof. Kim said, “This study is significant for developing IGZO phototransistors for visible -NIR detection without using photo-absorber”. This study was supported by the SKKU Research Fellowship Program of Sungkyunkwan University and in part by the Basic Science Research Program through the National Research Foundation of Korea (NRF-2021R1A2B5B02002167, 2021M3H4A1A02056037, 2021R1I1A1A01060065, and 2021R1I1A1A01060078) and published on 13th June 2022 in ACS Nano (I.F:18.03) Paper name: Probing the Efficacy of Large-Scale Nonporous IGZO for Visible-to-NIR Detection Capability: An Approach toward High-Performance Image Sensor Circuitry DOI: https://doi.org/10.1021/acsnano.2c01773 Article by Sen Anamika
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- 작성일 2022-11-16
- 조회수 8447
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- [Research] Prof. Sunkook Kim develops large area MoS2 film for transparent phototransistor
- Prof. Sunkook Kim ((Department of Advanced Materials Science and Engineering) develops large area MoS2 film for transparent phototransistor by plasma assisted chemical vapor deposition technique. Professor Sunkook Kim’s research team (Department of Advanced Materials Science and Engineering) developed a route to synthesis low temperature plasma assisted large area MoS2 film for transparent phototransistor. Transparent devices on low-cost glass substrate using transition metal dichalcogenides (TMDs), required additional mechanical transfer which induces wrinkles, voids, cracks on the channel and hinder the mass production. TMDs such as MoS2 have attracted considerable attention or the fabrication of ultra-sensitive and ultrathin photodetectors because of their layer-dependent bandgap, optical transparency, high current on/off ratio, high carrier mobility, temperature stability, and large scalability. However, the synthesis of MoS2 required high temperature (> 600 °C), therefore growth on an inexpensive transparent substrate with low thermal budgets is challenging. Numerous techniques have been proposed for obtaining MoS2 at low temperature (< 400 °C) including MOCVD, ALD, PECVD etc. MOCVD required long sulfurization time for large area coverage, while ALD either required post annealing or produce rough film at low temperature. Few groups have used PECVD to grow large area MoS2 film at low temperature, however poor quality of the film hinder their application in transistor. Research team of Professor Sunkook Kim (Arindam Bala, Liu Na and all the authors) have synthesis large area MoS2 film on inexpensive slide glass (MARIENFELD.) by plasma assisted chemical vapor deposition technique (≤ 400 °C) and fabricated 7 × 7 array of transparent phototransistor without additional mechanical transfer, which can detect visible light (λ = 405 nm, 652 nm). Prof. Kim said, “This study is significant for developing low-cost smart glass technologies”. This research was supported in part by the National Research Foundation of Korea. (No. 2021R1A2B5B02002167, 2020H1D3A2A02103378, 2020R1I1A1A01052893) This work was supported by Institute of Information & communications Technology Planning & Evaluation (IITP) grant funded by the Korea government (MSIT) (No. 2021-0-01151) and published on 10th August 2022 in Advanced Functional Materials (I.F.: 19.92). Paper name: Low-Temperature Plasma-Assisted Growth of Large-Area MoS2 for Transparent Phototransistors. DOI: https://doi.org/10.1002/adfm.202205106 Article by Bala Arindam
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- 작성일 2022-11-16
- 조회수 6195
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- [Research] J.-Y. Choi / H. K. Yu joint research team develops Ultrahigh Porosity MgO Microparticles for Heat-Energy storage
- J.-Y. Choi / H. K. Yu joint research team develops Ultrahigh Porosity MgO Microparticles for Heat-Energy storage The joint research team led by Professor Jae-Young Choi at SKKU school of advanced materials science, and engineering and professor Hak Ki Yu at Ajou University department of materials science and engineering has developed Ultrahigh-Porosity MgO Microparticles for thermochemical heat-storage reaction with high stability and exceptional reactant permeability. Professor Choi is also the co-CEO of C&C materials. Regarding paper has been published on Advanced Materials with the title “Ultrahigh-Porosity MgO Microparticles for Heat-Energy Storage”. Research on renewable energy, and waste heat retrieval and conversion, has been the key for carbon neutrality. Among those research retrieval of industrial waste heat has earned significant interest. Naturally, the development of materials that can meet the criteria for industrial waste heat retrieval is now more important than ever. Fig. Schematic illustration of the strategy for synthesizing porous MgO and images of a porous MgO particle. The research team has introduced ultrahigh porous structure to magnesium oxide (MgO), a highly promising candidate for waste heat storage, to develop high-performance heat energy storing material. This Ultrahigh Porosity MgO has 4 times more surface area than commercial MgO, and therefore is free of swelling during heat storage, enabling heat storage capacity 7.2 times bigger than commercial MgO. This Ultra-high Porosity MgO is expected to serve as key material for chemically storing industrial waste heat, and the research team will carry out follow-up research to develop new materials and control the structure of existing materials to overcome obstacles of nanomaterials. Funded by the National Research Foundation of Korea (NRF), this work has been published on Advanced Materials (IF=32.086) in July 2022. ※ Title: Ultrahigh-Porosity MgO Microparticles for Heat-Energy Storage ※ Authors: Youngho Kim1, Xue Dong1, Sudong Chae1, Ghulam Asghar, Sungwoong Choi, Bum Jun Kim#, Jae-Young Choi#, Hak Ki Yu# ※ DOI: https://doi.org/10.1002/adma.202204775 1 : Lead author 2 : Corresponding author
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- 작성일 2022-09-19
- 조회수 6259
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- [Research] Artificial intelligence (AI) for understanding and characterizing the ductile-brittle behaviors of Mg based materials
- Artificial intelligence (AI) for understanding and characterizing the ductile-brittle behaviors of Mg based materials On June11th, the research team led by Prof. Kotiba Hamad at the school of advanced materials science and engineering (AMSE)published a paper titled “Brittle and ductile characteristics of intermetallic compounds in magnesium alloys : A large-scale screening guided by machine learning” in the Journal of Magnesium and Alloys (IF =11.8) which is ranked the 1st in the category of metallurgy & metallurgical engineering according to Clarivate’s Journal Citation Reports’ (JCR) ranking. This study is one of the woks conducted by this group to investigate the applicability and the potential of AI techniques in the field of materials discovery and design. The findings of this work showed that, by machine learning (ML), a technique of AI, the brittle-ductile characteristics of intermetallic compounds that form in magnesium-based alloys are reliably, accurately, and quickly predicted. The ML results were validated by theoretical calculations done by density functional theory (DFT), shown by the figure below. The results can facilitate the designing of magnesium alloys with high performance for structural applications. This led to say that, due to the exploding computational capabilities, artificial intelligence, in its machine learning subcategory, has been utilized heavily in the field of material discovery and design for its ability to construct data-driven models that are magnitude faster than conventional experimentation or even physics-driven modeling and simulation. The present research group; Kotiba Hamad (Professor), Russlan Jaafreh (PhD candidate), Kang Woo Seong (Graduate collaborator/Currently working in ‘Computer Systems and Intelligence Laboratory’), and Santiago Pereznieto (Masters Student), have been utilizing the capabilities of AI in the field of material science & engineering, and have published multiple papers regarding this topic in high-tier journals such as: ACS Applied Materials & Interfaces, Journal of Materiomics and many more. Related Links and professor’s website: - Russlan Jaafreh, Yoo Seong Kang, Kotiba Hamad, Journal of Magnesium and Alloys 2022, DOI: doi.org/10.1016/j.jma.2022.05.006. - Russlan Jaafreh, Yoo Seong Kang, and Kotiba Hamad, ACS Applied Materials & Interfaces 2021 13 (48), 57204-57213, DOI: doi.org/10.1021/acsami.1c17378 - Professor Kotiba’s Website: kotibahamad995.wixsite.com/aem-skku
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- 작성일 2022-08-16
- 조회수 6186
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- [Research] Prof. Yunseok Kim’s research team demonstrates a new strategy for highly enhanced ferroelectricty
- Prof. Yunseok Kim’s research team demonstrates a new strategy for highly enhanced ferroelectricty in HfO2-based ferroelectrics using ion bombardment - Published in ‘Science’ - These findings open pathways for nanoengineered binary ferroelectrics and subsequent ferroelectric-seminconductor integration. The research team* of Professor Yunseok Kim demonstrate a way to highly enhance ferroelecticity of HfO2-based ferroelectrics using ion bombardment. * Co-corresponding authors : Prof. Young-Min Kim(SKKU), Dr. Jinseung Heo (Samsung Advanced Institute of Technology), Dr. Sergei Kalinin (Oak Ridge National Laboratory, USA) Continuous advancement in nonvolatile and morphotropic beyond-Moore electronic devices necessitates the development of strategies that utilize the wealth of functionalities of complex materials at extremely reduced dimensions. The discovery of ferroelectricity in hafnium oxide (HfO2)–based ferroelectrics that are compatible with the semiconductor process has opened interesting and promising avenues of research. However, the origins of ferroelectricity and pathways to controlling it in HfO2-based ferroelectrics are still mysterious. We report that local ion bombardment can activate ferroelectricity in these materials. The possible competing mechanisms, including ion–induced molar volume changes, vacancy redistribution, vacancy generation, and activation of vacancy mobility, are discussed. These findings including the variation of ferroelectricity through defect engineering based on ion bombardment suggest additional possibilities for ferroelectricity enhancement in HfO2-based ferroelectrics. Furthermore, this approach can be directly applied to a semiconductor process without structural modification and, thus, can increase its applicability in next-generation electronic devices, such as ultrascaled ferroelectrics-based transistors and memories. Paper ￮ “Highly enhanced ferroelectricity in HfO2-based ferroelectric thin film by light ion bombardment”, Science 376(6594), 731-738 (2022) ￮ URL: https://www.science.org/doi/10.1126/science.abk3195 Webpage: http://spm.skku.edu
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- 작성일 2022-07-27
- 조회수 5578
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- [Research] Prof. Jeong Min Baik’s research group develops high-performing SCR catalysts for tackling air pollution
- Prof. Jeong Min Baik’s research group develops high-performing SCR catalysts for tackling air pollution - Low-temperature SCR catalyst developed impregnating highly-dispersed CuO–CeO2 nano-heterostructures - Published in Chemical Engineering Journal on Feb, 2022 Prof. Jeong Min Baik’s research group in tandem with Dr. Hong-Dae Kim (KITECH) and Prof. Hyesung Park (UNIST) developed nitrogen oxides (NOx) removal catalyst exhibiting superior catalytic performance at the low temperature (180oC~220oC). Selective Catalytic Reduction (SCR), is a widely-used industrial technique that converses the NOx—the leading cause of the air pollution—into N2 or H2O by using ammonia as a reducing agent. However, widely-used VO2/TiO2 catalysts have fatal setbacks such as causing catalytic deactivation owing to agglomeration with its limited performance at high operation temperature (250℃ or higher), not to mention its high maintenance costs. Therefore, developing a low-temperature catalyst showing high activation at about 200℃ increasingly gained importance, though, deactivation owing to SO2 and water used to be a challenge. To cope with, the research team fabricated ultra-small (<5 nm in size) CuO–CeO2 heterostructures with atomically well-defined interface followed by impregnation to V2O5–WO3-CeO2/TiO2 (2V-10Ce-1W/Ti) catalysts, achieving 44% higher Nox removal efficiency than the conventional catalysts. Also, they succeeded in raising K-factor (K16h/K0) from 0.60 to 0.83 under SO2 atmosphere, as well as the resistance towards the water. “We are soon going to check its industrial applicability through conducting empirical experiments. Through follow-up research, we will develop catalysts with a longer operation at below 200°C." Prof. Baik stated. In this regard, the research team has already applied for two patents. The experts expect that the cost for reducing NOx emissions from industrial sites such as factories and steel mills will be drastically reduced. This work was supported by the Ministry of Trade, Industry, and Energy, South Korea (MOTIE, 20005721), by the Mid-Career Researcher Program through the National Research Foundation of Korea (NRF) grant funded by the Korea government (NRF-2019R1A2C2009822), and by National R&D Program through the National Research Foundation of Korea(NRF) funded by Ministry of Science and ICT (2021M3C1C309). ※ Paper : Cu- and Ce- promoted nano-heterostructures on vanadate catalysts for low-temperature NH3-SCR activity with improved SO2 and water resistance ※ https://doi.org/10.1016/j.cej.2022.135427
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- 작성일 2022-04-22
- 조회수 5772
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- [Faculty] Professor Jung selected as SKKU Fellowship Professor
- 2021 SKKU-Fellowship Professor Sungkyunkwan University selected the ‘2021 SKKU-Fellowship’ professors. The list of professors starts with D. Normandin Shawn (English Language and Literature), Doo Jin Ryu (Economics), Hoon Seok Choi (Phychology), Donghun Lee (Education), Jae Seong Lee (Biological Sciences), Junsin Yi (Electronic and Electrical Engineering), Jun Yeob Lee (Chemical Engineering), Hyun Suk Jung (Advanced Materials Sciences and Engineering), Sang Won Seo (Medicine), Seung Ho Ryu (Medicine), Yoon Suk Jung (Medicine). The SKKU-Fellowship system has been awarded by Sungkyunkwan University since 2004 and is a system that grants exceptional research support and honor by selecting the best professor whose level of research capability has settled on global standards. The purpose of this scheme is to improve the research environment, which allows professors with the highest level of research to demonstrate world-class research capabilities more qualitatively than quantitative growth by minimizing lecturing duties.
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- 작성일 2022-02-23
- 조회수 5144
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- [Alumni] Dr. Seong in Hong employed as an assistant professor at Gachon University
- Dr. Seong in Hong employed as an assistant professor at Gachon University Dr. Seong in Hong from Nano/Bio AI Electronics Lab (NBAIEL) is starting his career as an assistant professor at the department of physics, Gachon University in coming March. Dr. Hong was honored Ph.D. degree with his study, “Thin film field-effect phototransistors” and served as a postdoctoral researcher at the University of Texas at Austin. Dr. Hong, under Prof. Sunkook Kim’s guidance, is highly engaged in developing next-generation semiconductor materials. His findings were published in a total of 28 distinguished SCI journals such as Nature Communications, Advanced Materials, and ACS Nano. Moreover, while he was a Ph.D. candidate, he was selected for national research projects such as [NRF] ROK-CANADA Global Research Program (GRA), [NRF] Creative-challenge Research Project, [BK] Global Postdoctoral Fellowship Program (GPF). Dr. Hong also had a few challenges to this end, due to lab relocation, pandemic-related research frustration, and so on. However, with support and encouragement from the advisor, Prof. Sunkook Kim, he has managed difficult situations into opportunities. According to Dr. Hong, transfer to AMSE broaden his horizons as a researcher and drove his resolution to remain in the field to extend his research and foster experts. Dr. Hong managed this pandemic crisis by devoting his time to innovative studies as a post-doctor in Prof. Kim’s lab. He said, “As a result, I was able to expand my research capability during my time at AMSE, with its superior research infrastructure and support.” Currently, Dr. Hong is leading ‘Overwhelming Nano Electronics Laboratory’ after being appointed at Gachon University. He is committed to grow cutting-edge semiconductor materials to develop devices with top-notch performance.
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- 작성일 2022-02-15
- 조회수 3164