DC Field | Value | Language |
---|---|---|
dc.contributor.advisor | Kang, Sang-Won | - |
dc.contributor.advisor | 강상원 | - |
dc.contributor.author | Ahn, Ji-Hoon | - |
dc.contributor.author | 안지훈 | - |
dc.date.accessioned | 2011-12-15 | - |
dc.date.available | 2011-12-15 | - |
dc.date.issued | 2009 | - |
dc.identifier.uri | http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=309285&flag=dissertation | - |
dc.identifier.uri | http://hdl.handle.net/10203/49662 | - |
dc.description | 학위논문(박사) - 한국과학기술원 : 신소재공학과, 2009.2, [ xiv, 134 p. ] | - |
dc.description.abstract | The downscaling of the DRAM device is necessary to achieve higher speed with less power consumption. It is getting difficult to meet the new requirements with the existing $SiO_2$ or $Si_3N_4$ due to their low dielectric constants and tunneling leakage currents through the thin layers. For this reason, high-$\textit{k}$ materials enabling high-k and low leakage currents with physically thicker film have received considerable attention. Among the candidate for DRAM capacitor dielectrics, $SrTiO_3$ is a promising candidate for giga-bit scale dynamic random access memory (DRAM) capacitors because of its high dielectric constant, high breakdown strength and good thermal stability. $SrTiO_3$ films were deposited on 20 nm-Ru/25 nm-TiN/p-type Si (100) substrates by plasma-enhanced atomic layer deposition at a deposition temperature of 225℃ and a deposition pressure of 3 Torr using 0.2M $Sr(DPM)_2$ dissolved in butyl acetate and TTIP as precursors and $O_2$ plasma as an oxidant. SrO and $TiO_2$ films were grown separately to investigate the ALD characteristics. The thickness per cycle of SrO and $TiO_2$ are saturated to 0.054 nm/cycle 0.036 nm/cycle at 225℃, respectively. The composition of STO films was controlled by changing the number of each precursor cycles, and stoichiometric $SrTiO_3$ films were obtained when one super-cycle consisted of six $TiO_2$ cycles and seven SrO cycles. The deposited-$SrTiO_3$ films were crystallized after annealing at 600℃ for 10min under $N_2$ ambient and the dependence of the dielectric constant on $SrTiO_3$ film thickness was investigated for less 50 nm-thick $SrTiO_3$ films after the annealing process at 600℃ for 10 min under $N_2$ ambient. The dielectric constants of the films having thickness higher than 20 nm were not as sensitive to the film thickness with a relatively constant value of about 65. However, the dielectric constants of the films with thickness under 15 nm were dramatically decreased with decreasing the fil... | eng |
dc.language | eng | - |
dc.publisher | 한국과학기술원 | - |
dc.subject | atomic layer deposition | - |
dc.subject | thin films | - |
dc.subject | dielectric | - |
dc.subject | SrTiO3 | - |
dc.subject | 원자층증착법 | - |
dc.subject | 유전박막 | - |
dc.title | (A) study on $SrTiO_3$ thin films deposited by plasma-enhanced atomic layer deposition for DRAM capacitor dielectric | - |
dc.title.alternative | PEALD법으로 증착된 DRAM capacitor 유전체용 $SrTiO_3$ 박막의 특성에 관한 연구 | - |
dc.type | Thesis(Ph.D) | - |
dc.identifier.CNRN | 309285/325007 | - |
dc.description.department | 한국과학기술원 : 신소재공학과, | - |
dc.identifier.uid | 020037364 | - |
dc.contributor.localauthor | Ahn, Ji-Hoon | - |
dc.contributor.localauthor | 안지훈 | - |
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.