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- "One-tenth of silicon semiconductor thickness" Ultra-thin semiconductor development
- IBS · Sungkyunkwan University joint research team developed "Grape-molybdenum disulfide optical sensor" Korean researchers have developed ultra-thin semiconductors using only one-tenth the thickness of silicon semiconductors using next-generation semiconductor materials. The joint research team of IBS nanostructured physics research group (Team leader: Professor Lee Younghee), Sungkyunkwan University professor Yu Woojong and UCLA Professor Xiang Feng Duan of U.S.A., said they have developed 1.3 nanometer (nm, 1 billionth of a meter) Grape-molybdenum ultra-thin semiconductors on 9th. Graphene, a carbon nanomaterial removed from the surface layer of graphite, is called 'new material for dream' because of its excellent electrical and chemical properties, but it is difficult to use as a semiconductor device because there is no bandgap that is the energy difference of electrons. The team has overcome the limitations of graphene by introducing molybdenum disulfide (MoS2), which is a two-dimensional material, such as graphene, with a band gap. Molybdenum disulfide and graphene were piled up and used as semiconductors and electrode materials to develop semiconductor optical sensors. The graphene-molybdenum disulfide semiconductor has a thickness of 1.3 nanometers, only one-tenth of the 14 nanometer (nm) limit of the three-dimensional silicon semiconductor. The problem of excessive power consumption and heat generation of the silicon semiconductor can be solved, and the voltage required for the operation can be greatly reduced. Ultra-thin semiconductors are expected to contribute to the development of high-efficiency optical devices. Since the photocurrent efficiency generated between graphene and molybdenum disulfide is high, it is not necessary to use the p-n junction method used in the conventional optical device fabrication. A p-n junction is a heterojunction between two semiconductor materials with different electrical properties, and is used to fabricate optical devices that absorb external light to generate electrical signals or energy. However, since the p-n junction structure requires a thickness of 14 nm or more, it has been difficult to develop an optical device with a thin two-dimensional material. Professor Yu Woojong said, "We will be able to apply it to the development of ultra-small semiconductor, high-efficiency optoelectronic devices, and new transparent electronic devices for wearable devices and the Internet." From the left Professor Lee Younghee, Professor Yu Woojong The findings are published in the prestigious international journal Nature Communications.
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- 작성일 2017-01-16
- 조회수 3850
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- "Foreigners’ SKKU Life" Professor ROTT Carsten
- "Foreigners’ SKKU Life" Professor ROTT Carsten Last summer, summer special courses of the Department of Physics were held in which we invite scholars from our country and abroad. Department of Physics Professor ROTT Carsten was the interviewee "Foreigners’ SKKU Life" this time. He is doing astronomical particle research in physics and IceCube neutrino detector which is the largest neutrino detector in the world. We have interviewed him asking his foreign life as a foreigner from Germany. Before coming to Korea, he was a senior researcher at Ohio State University. But he wanted to stop the study in conjunction with thought of what only he can do, The place gave him a chance to fulfill that dream was SKKU. he learned about our school while participating workshop held in Tokyo. There, he met a professor of SKKU and heard stories about our school. He was looking for the place to achieve his goal and expected to come to our school. Carsten then faced the news that he could come to our school Sungkyunkwan University becoming a leading university. He also be able to have opportunity to be more international. Carsten thought his research program goes well with goal of SKKU and support for science in Korea is very attractive. He said that strengths of South Korea are we knows points to where the investment and recognize the value of education and science. Although many studies of other countries are experiencing difficulties with budget shortfalls, South Korea, tend to invest in science is much more positive. Since South Korea is ready to play a big role internationally, one of his hope is both South Korean education system and research programs changes more internationally. He thinks students of South Korea also work hard so that there are lots of potentials for country development. Carsten also showed satisfaction for his team. He said he gets chances to be closer to the students while studying, so he put lots of effort and time for research in the process. He shows expectation about South Korea as a country to a dynamic and rapidly developing.
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- 작성일 2016-12-27
- 조회수 3433
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- Development of thin film solar cell with high efficiency using the pure organic dye
- Development of thin film solar cell with high efficiency using the pure organic dye - Professor Ryu-Dohyun team of chemistry , achieved world's highest energy conversion efficiency of 9.1% - Improving an existing light photoactive layer thickness of 10 micrometers by 5 micrometers or less - Development of solar PV systems possibly used indoor □ Sungkyunkwan University (President Jeong-Gyusang) announced that chemistry professor Ryu-Dohyun research team in collaboration with Gwon-Taehyeok research team of Ulsan National Institute of Science and Technology synthesized new dyes and succeeded to reach world's highest efficiency of dye-sensitized thin film solar cell. □ The study was selected as cover paper (Dissertation title: Photoactive Thin Films: Indoline-Based Molecular Engineering for Optimizing the Performance of Photoactive Thin Films) in materials sector of worldwide journal Advanced Functional Materials on Oct. 10th. □ Mr. Ryu's team synthesized the new indoline dyes which are pure organic materials and applied those of the thickness of the photoactive layer is 2 micrometers (μm) or less to the thin film dye-sensitized solar cell achieving world-leading solar energy conversion efficiency of 9.1%. In addition to identifying the correlation of alkyl chain length and efficiency of organic dyes mechanism with a planar structure, it gave you a direction for future development of high-efficiency thin-film solar cells. □ Dye-sensitized solar cell having transparency, flexibility and colorfulness has received the attention of many researchers because it is capable to operate in the interior and suitable for building integrated photovoltaic systems (BIPV). Therefore, thin film-like dye-sensitized solar cell of high efficiency development has been recognized as a very important part. However, organic dyes had been undesirable situation in terms of cost-effective energy conversion of thick film of more than 10 micrometers (μm). □ Professor Ryu-Dohyun of SKKU who led the study said "The significance of this study is to develop a new organic dye-sensitized solar cell with high efficiency in thin film." He also said, "It presents a direction to the design of a new organic dye structure by identifying how the length of the alkyl chain attached to an organic dye having a plane structure affects the light energy conversion efficiency." □ The study was carried out with the support of Ministry of Science, ICT and Future Planning and National Research Foundation of Korea.
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- 작성일 2016-12-23
- 조회수 3336
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- Broadened Relationship with NTU in Life Science
- The College of Science recently establish a formal and supported relationship with the College of Life Science, National Taiwan University to make full-fledged ties with the most prestigious university in Taiwan. It was a part of our college’s persistent efforts to bring about strong collaboration with NTU in natural sciences and a natural as well as solid outcome of Dean KWON Young Uk’s official visit to Taipei in September. It is expected for both institutions to generate student and scientific exchanges in forthcoming days.
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- 작성일 2016-12-20
- 조회수 3346
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- Professor SONG Choongeui's research team, solved challenging organic chemistry problem
- Sungkyunkwan University professor SONG Choongeui team, solved challenging organic chemistry problem The team pioneered path for production of high-value compounds required for the bio-pharmaceutical industry Professor SONG Choongeui, Max-Planck researcher Bae-Hanyong Sungkyunkwan University presented that professor SONG Choongeui’s research team of organic chemistry has solved the Mannich reaction of primary alkyl compounds. Research results were recently published in the chemistry journal 'Angewandte Chemie'. Mr. Song's team reported the synthesis method of Sitagliptin which is known as diabetes medicine, through application of developed technology. In South Korea, Sitagliptin is known as the best-selling medicine on the prescription drug market in fourth quarter of 2015. Mr. Song's team finished third axis of Sitagliptin synthesis using the green "organic catalysts" system that does not contain any transition metal. Academia discussed its high possibility for decades about this issue and Mr.Song’s team realized it, "The study will make it easy to produce high-value compounds for a variety of eco-friendly and simple process for contributing to the health industry," Mr. Song said.
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- 작성일 2016-12-16
- 조회수 3261
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- Songcheon ㆍ Hyocheon Scholarship Ceremony
- Songcheon ㆍ Hyocheon Scholarship Ceremony A ceremony for the conferment of certificate of scholarship from Songchon Scholarship Foundation and Hyochuan Scholarship Foundation was held at professor meeting room in Chemistry Hall of Sungkyunkwan University Natural Science Campus, on November 10th 2016. At this ceremony, 3 scholarships were awarded to 3 undergraduates selected as Songcheon Scholarship students and 3 scholarships were awarded to 3 undergraduates selected as Songchon Foundation scholarship recipients. They were awarded of 3 million won respectively. 4 scholarship recipients were selected for the scholarship of Hyochun Cho Kyuhak Scholarship students and full scholarship was delivered. In addition, professors from the Department of Chemistry attended and gave encouragement to students. At the scholarship donation ceremony, Ryu Deokhee and Cho Kyuhak alumni encouraged them to be global chemists who contribute to the nation by building wisdom based on their knowledge. Ryu Deokhee and Cho Kyuhak alumni encouraged students to have patience and diligence so that they would not be disturbed by any difficulties. President, Ryu Deok Hee President, Cho Kyu Hak
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- 작성일 2016-12-12
- 조회수 3202
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- SKKU scouted 'Paper king' Professor Kinkar Chandra Das
- SKKU scouted 'Paper king' Professor Kinkar Chandra Das There was a big stir in June 2012 for the academic papers published in the ‘Physical Review Letters’. The author of this paper that proposed a new theory on the principle for Higgs particle generation, called 'God’s particle' is Konkuk University Physics Professor Zheng Kingman. He is a physicist came from Taiwan in 2009 Konkuk University. Konkuk University scouted professor Kawai of Osaka University known as the "Godfather of nano-science" as full-time faculty. In Physics and Mathematics Assessment of basic science and engineering sciences, it was marked by outstanding research achievements of foreign professors. Basic science receiving relatively less attention from the domestic Scout Professor shown excelled in overseas universities or foreign scholars that the future is promising. Foreign professors of basic science in this department are evaluated in many cases both high quantity and quality of the paper. Department of Mathematics of Sungkyunkwan University recorded the highest standards in quality and quantity of international journal articles among 51 assessed mathematics. The protagonist recorded the highest number of papers and citations number of times in this department was Professor Kinkar Chandra Das from India. He turns out 10-20 papers published international journal each year. It is counted as 1-2 papers in a month. Fellow professor assessed that "He is a true study-holic".
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- 작성일 2016-11-24
- 조회수 3375
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- National Junior College Singapore’s Visit to CS and Chemistry
- A group of 8 visitors, 2 leading teachers and 6 students visited our Natural Sciences Campus to have a campus and laboratory tour on Tuesday, November 15. It was organized as a part of joint student exchange program between Gyeonggi Science High School for the Gifted and NJC. Visitors were given a chance to hear about SKKU and College of Science, and also to look around chemistry research facilities and infrastructure.
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- 작성일 2016-11-16
- 조회수 3243
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- IBS Research Team developed "Resembling the human brain memory device"
- Resembling the human brain memory device development IBS Nanostructures Physics Research Team developed 'tunneling memory' by two-dimensional nanomaterials In March, the artificial intelligence(AI) 'Alpha-Go' of Google that beat Lee Se-dol caught attention for its low-power, energy-consuming and high-performance operating 1200 computer CPUs and comsuming 56 kilowatts (kW) power per hour, This is a special Software (SW) applied to it. Existing computer is fast in the sequentially calculating process such as mathematical calculations, but it is not suitable for parallel computation AI required. However, Alpha-Go was designed by applying a special SW to enable parallel computing. If it can be made in memory, it will also be able to implement the function of AI in a small smartphones. Korean researchers have developed a next-generation memory device for realizing these. A synapse (left) to deliver and store information in the human brain and two electrodes memory device that researchers developed (bottom right) / data = IBS Basic Science Institute (IBS) nanostructures Physics Research Center (Director Lee Young-hee, Sungkyunkwan University Department of Physics, Professor), Yu-Woojong Sungkyunkwan University Department of Electrical Engineering and co-researchers announced that they has succeeded in implementing a semiconductor device. The human brain synapses (site to send and receive thousands, tens of thousands of signals attached to the ear of the nerve cells) send and receive signals to the two projections corresponding to the electrode of the device, and stores the memory to leave a residual image signal. The human brain can rapidly process a high degree of parallel operation with little energy based on the same synaptic system. Researchers newly design the existing memory hardware structure to develop a memory that mimics the structure of the synapse. Researchers first eliminate the 'storage electrode' (gate) in a flash memory structure having a conventional three electrodes. Instead, they developed tunneling memory that works like a synapse performing signal transmission and storage at the same time. According to researchers, tunneling memory is a two-dimensional nanomaterial made with Graphene, hexagonal boron nitride (h-BN), and molybdenum disulfide (MoS2). Graphene is a good carbon material with electric conductivity and thermal conductivity, and hexagonal boron nitride is a new material that can maintain full performance to materials and devices minimizing the interaction between the substrate and the electronic materials and devices. Molybdenum disulfide is new material that can be applied to electronic and optoelectronic devices. According to researchers, tunneling memory structure can be directly applied to a silicon memory. It also has low power consumption and high material stability with only a two-dimensional nanomaterials with good elasticity so that can provide elastic supports. Tunneling memory is expected to be applied to future wearable device. Professor Lee said, "We have plan to develop system using a tunneling memory as synapse like a signal transmission system of the brain cells.“ Hee added, "Further research will be completed in small digital devices, such as smartphones." The study results were published in the international journal "Nature Communications".
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- 작성일 2016-11-15
- 조회수 3333
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- Universiti of Teknologi Petronas, Visited College of Science for Developing Student Mobility
- A delegation led by Dr. Hanita Daud, head of Fundamental and Applied Science Department of Universiti of Teknologi Petronas (UTP) visited the College of Science on November 9 to meet with Dean KWON Young-Uk, Professor CHUN Changbum of mathematics, and Professor CHOI Wooseok of physics and shared ideas about initiating student exchange program between two Universities. Both parties has agreed to start student exchange from 2017 and investigate the possibilities of laboratory internship programs.
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- 작성일 2016-11-10
- 조회수 3311