(A) study on the plasma-enhanced atomic layer deposition of Ta-N, Ti-N and Ti-Si-N thin films = Ta-N, Ti-N, Ti-Si-N 확산방지막의 플라즈마를 이용한 원자층 증착법에 관한 연구

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As increasing demand for smaller, faster electronic devices in ultralarge scale integrated devices (ULSI), copper (Cu) with a lower resistivity and an enhanced electromigration resistance represents a promising material for providing better performance as an interconnect metal than aluminum (Al) alloys which are currently in use. However, Cu forms Cu-Si compounds and an easily drift through the oxide at a low temperature. Therefore, a diffusion barrier between Cu and its underlying layers is thought to be a prerequisite for Cu to be used in application for silicon integrated circuits. The plasma-enhanced atomic layer deposition (PEALD) of tantalum nitrides (TaN) thin films has been performed using terbutyl-imidotris(diethylamido)tantalum and hydrogen radicals at a temperature of 260℃. The films thickness per cycle is also self-limited at 0.8Å/cycle, which is thinner than that of the conventional atomic layer deposition (ALD), 1.1Å/cycle. The PEALD yielded superior Ta-N films with an electric resistivity of 400 μΩ-cm and no aging effect under exposure to air owing to the increased film density and crystallinity, and the presence of TaC bonding. X-ray diffraction analysis indicates that the as-deposited films are not amorphous but polycrystalline mixed with cubic TaN and TaC. The film crystallinity as well as the film density increases with the pulse time and the electrical power of the hydrogen plasma used. The films were Ta-rich in composition and contain around 15atom% of carbon impurity. In addition, it has been shown that films, which are formed by the PEALD, retain perfect step coverage on the submicrometer holes with an aspect ratio of 10:1. In Ti-N thin films deposited with TDMAT and $N_2$ plasma, nitrogen radical are used as a reducing agent instead of $NH_3$. Like Ta-N case, the Ti-N films formed by PEALD have a good resistivity with about 440 μΩ-cm and cubic TiN structure at 180℃. However, the carbon impurity in films decreases at 15 atom% as the po...
Advisors
Kang, Sang-Wonresearcher강상원researcher
Description
한국과학기술원 : 재료공학과,
Publisher
한국과학기술원
Issue Date
2002
Identifier
177280/325007 / 000995160
Language
eng
Description

학위논문(박사) - 한국과학기술원 : 재료공학과, 2002.8, [ xi, 139 p. ]

Keywords

Ta-N; Diffusion barrier; ALD (Atomic Layer Deposition); PEALD (Plasma Enhanced Atomic Layer Deposition); Ti-Si-N; Ti-Si-N; Ta-N; 확산 방지막; 원자층 증착법; 플라즈마 원자층 증착법

URI
http://hdl.handle.net/10203/50266
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=177280&flag=dissertation
Appears in Collection
MS-Theses_Ph.D.(박사논문)
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