신소재공학과

행사일  
2014년 8월 21일 (목) 개최되는 특별 세미나를 아래와 같이 안내해드립니다.


= 아 래 =


1. 일 시 : 2014. 8. 25 (월), 10:30 ~
2. 장 소 : 신소재 공학과 2429호
3. 연 사 : 김 현 석 교수(충남대학교 재료공학과)
4. 제 목 : 차세대 디스플레이 응용을 위한 고이동도, 고신뢰성 산화물 박막 트랜지스터 기술
5. 발표내용요약(Abstract)

  Increasing demands for high performance transistors for flat panel displays have led to the development of high mobility metal oxide based semiconductors such as In-Ga-Zn-O (IGZO). Thin-film transistors (TFTs) that use such materials have field effect mobility exceeding 10 cm2/Vs, and are suitable for AMLCDs with ultra definition (4000 x 2000), large size (> 70 inch). However, display technology is now oriented towards AMOLED displays, which need driving transistors with higher field effect mobility. In this work, an alternative type of high mobility semiconductor, zinc oxynitride (Zn-O-N), is studied by both theoretical calculations and experimental evaluation of thin films and TFT devices. Hall measurements of reactively sputtered Zn-O-N films indicate that the material is n-type. First principles density functional theory (DFT) calculations are performed to examine the carrier effective mass in pure zinc nitride (Zn3N2), and nitrogen vacancies (VN) are found to be the most dominant shallow donor-like defects. It is shown that doping with metal cations that form a stronger bond with nitrogen leads to the suppression of free carriers, which is confirmed experimentally by doping high mobility Zn-O-N films with gallium (Ga) and aluminum (Al). Thin film transistor devices fabricated using both undoped and Ga-doped Zn-O-N further show such defect reduction, resulting in decreased off-currents and subthreshold swing.

No. Subject Author Date Views
Notice 7/25 (Wed) 김창섭 박사 (Department of MSE, MIT) ADMINI 2018.07.24 16
Notice 7/13 (Fri) Prof. Dong Ryeol Whang (Johannes Kepler University Linz,Austria) ADMINI 2018.07.09 13
Notice 6/5 (Tue) 이성환 교수 (Baylor University) ADMINI 2018.06.05 54
Notice 5/29 (Tue) 오상호 교수 (연세대학교 의과대학 피부과학교실) ADMINI 2018.05.29 51
Notice 5/15 (Tue) 김명길 교수 (중앙대 화학과) ADMINI 2018.05.15 93
132 11/28 (금) 오태식 박사 (University of Pennsylvania) Administrator 2014.11.26 2095
131 11/14 (금) Dr. Amanda K. Petford-Long (Argonne National Laboratory) file Administrator 2014.11.04 2044
130 2014 가을학기 정기세미나 일정 Administrator 2014.08.28 4486
» 8/25 (월) 김 현 석 교수(충남대학교 재료공학과) Administrator 2014.08.26 2536
128 8/21 (목) Prof. Frans Spaepen (Harvard University, School of Engineering and Applied Sciences) Administrator 2014.08.14 2134
127 7/21 (월) Jamie Warner (University of Oxford) Administrator 2014.07.16 2593
126 6/12 (목) 정호용 교수 (Florida State University 부임예정) Administrator 2014.06.09 2826
125 6/10 (화) 강성모 총장님 (KAIST) Administrator 2014.06.09 2106
124 6/3 (화) Prof. Alfredo Alexander-Katz (Dept. of MSE, MIT) Administrator 2014.06.03 3078
123 5/20 (화) 윤석진 박사 (한국과학기술연구원, 연구기획조정본부장) Administrator 2014.05.14 2743
122 5/14 (수) 김윤섭 (Univ. of Michigan, Ph.D. candidate) Administrator 2014.05.14 2566
121 4/30 (수) 김지환 박사 (IBM T.J. Watson Research Center) Administrator 2014.05.01 3067
120 4/29 (화) Dr. Aron Walsh (Univ. of Bath, UK) Administrator 2014.05.01 2097
119 4/29 (화) 박상희 교수 (KAIST 신소재공학과) Administrator 2014.04.23 3051
118 4/22 (화) 조은애 박사 (Fuel Cell Research Center, KIST) Administrator 2014.04.21 3449
117 4/15 (화) 김수호 박사 (Chief Technology Offiicer, Alantum Corporation) Administrator 2014.04.11 3032
116 4/8(화) 이종흔 교수 (고려대학교 신소재공학부) Administrator 2014.04.08 3975
115 4/1(화) 장호원 교수 (서울대학교 재료공학부) Administrator 2014.03.26 2935
114 3/27 (목) 남성욱 박사 (IBM T.J. Watson Research Center, Research Scientist) Administrator 2014.03.24 3575
113 3/25 (화) 황현상 교수 (포항공과대학교 신소재공학과) Administrator 2014.03.21 3145