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Professor Seong-Ihl Woo Develops New High-Speed Research Method
Professor Seong-Ihl Woo Develops New High-Speed Research Method
Reduce research periods and expenses for thin film materials several ten times
Posted on the online version of Proceedings of National Academy of Sciences of the United States of America (PNAS) on January 9
A team led by Seong-Ihl Woo, a professor of KAIST Department of Chemical & Biomolecular Engineering and the director of the Center for Ultramicrochemical Process Systems, has developed a high-speed research method that can maximize research performances and posted the relevant contents on the online version of Proceedings of National Academy of Sciences of the United States of America (PNAS), a distinguished scientific journal, on January 9, 2007.
Professor Woo’s team has developed a high-speed research method that can fabricate several tens or several thousands of thin films with different compositions (mixing ratio) at the same time and carry out structural analysis and performance evaluation more than ten times faster and accurately, which leads to the shortening of the research processes of thin film materials. This is an epoch-making method that can reduce research periods and expenses several ten times or more, compared to the previous methods.
The qualities of final products of electronic materials, displays, and semi-conductors depend on the features of thin film materials. Averagely, it takes about two weeks or longer to fabricate a functional thin film and analyze and evaluate its performances. In order to fabricate thin film materials in need successfully, more than several thousand times of tests are required.
The existing thin film-fabricating equipment is expensive one demanding high-degree vacuum, such as chemical vapor deposition, sputtering, physical vapor deposition, laser evaporation, and so on. In order to fabricate thin films of various compositions with this equipment, a several million won-worth target (solid-state raw material) and precursors (volatile organic metal compound) pricing several hundreds won per gram are required. Therefore, huge amount of experiment expense is demanded for fabrication of several ten thousands of thin films with various compositions.
Professor Woo’s team has developed ‘combinatorial droplet chemical deposition’ equipment, which does not demand high-degree vacuum and is automated by computers and robots, by using a new high-speed research measure. The equipment is priced at about 1/5 of the existing equipment and easy for maintenance.
This equipment uses cheap reagents, instead of expensive raw materials. Reagents necessary to form required compositions are dissolved in water or proper solvents, and then applied by high frequencies to make several micrometer-scaled droplets (fine liquid droplet). Theses droplets are moved by nitrogen and dropped onto a substrate, which is to be fabricated into a thin film, and then subsequent thermal treatment is applied to the substrate to fabricate a thin film of required composition. At this moment, several tens or several hundreds of thin films with various compositions can be fabricated at the same time by reducing the size of thin film specimens into millimeter scale with the use of shade mask and adjusting vaporization time with masks, the moving speed of which can be adjusted. The expenses for materials necessary for the fabrication of thin films with this equipment amount to several ten thousands won per 100 grams, which is in the range of 1/100 and 1/10 of the previous methods, and the research period can be shortened into one of several tenth.
“If this new method is applied to the development of elements in the fields of core energy, material and health, which have not been discovered by the existing research methods so far, as well as researches in thin film material field, substantial effects will be brought,” said Professor Woo.
‘Combinatorial droplet chemical vaporization’ equipment is pending a domestic patent application and international patent applications at Japan and Germany. This equipment will be produced by order and provided to general researchers.
2007.02.02 View 19366 -
Nobel Laureate Heads KAIST
Nobel Laureate Heads KAIST
By Kim Tae-gyu / Staff Reporter
THE KOREA TIMES 05-29-2004
A Nobel laureate will lead the Korea Advanced Institute of Science and Technology (KAIST), winning a stiff race with a pair of strong Korean candidates.
The KAIST on Friday said the state-financed institute appointed Robert Laughlin as its 12th president instead of two local hopefuls, professors Shin Seong-cheol and Park Seong-ju.
This is the first time that foreigners take charge of the KAIST since it was established in 1971 and Laughlin also is noted in the history as the first Nobel Prize winner to head Korea"s educational institute.
After receiving approval of Science-Technology Minister Oh Myung, Laughlin will be inaugurated as early as next month, according to a KAIST official.
Laughlin, a Stanford professor, made his name after being co-awarded the 1998 Nobel Prize in Physics with Horst Stoermer and Daniel Tsui for the discovery of a new form of quantum fluid.
The findings, which explained the fractional quantum hall effect for the first time, have been recognized as a significant breakthrough in understanding quantum physics.
The American physicist had also sustained a special connection with Korea even before he garnered the prestigious prize and has visited Korea several times.
Early last month, Laughlin was named to head the Asia Pacific Center for Theoretical Physics (APCTP) in recognition of his notable interest in Korea.
The APCTP is an international research institute headquartered inside Pohang University of Science and Technology in North Kyongsang Province.
voc200@koreatimes.co.kr
2004.05.31 View 21209