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Thermodynamic properties and interfacial layer characteristics of HfO2 thin films deposited by plasma-enhanced atomic layer deposition

Authors
Kim, InhoeKuk, SeoungwooKim, SeokhoonKim, JinwooJeon, HyeongtagCho, MHChung, KB
Issue Date
May-2007
Publisher
AMER INST PHYSICS
Citation
APPLIED PHYSICS LETTERS, v.90, no.22, pp.1 - 4
Indexed
SCIE
SCOPUS
Journal Title
APPLIED PHYSICS LETTERS
Volume
90
Number
22
Start Page
1
End Page
4
URI
https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/172316
DOI
10.1063/1.2743749
ISSN
0003-6951
Abstract
The thermodynamic properties and interfacial characteristics of HfO2 thin films that were deposited by the direct plasma atomic layer deposition (DPALD) method are investigated. The as-deposited HfO2 films that were deposited by the DPALD method show crystallization of the HfO2 layers, which initiates at approximately the 35th cycle (about 2.8 nm) of the DPALD process. Medium-energy ion scattering analysis reveals that the direct O-2 plasma causes a compositional change in the interfacial layer as the process progresses. With an increase in the number of process cycles, the Si content decreases and the O content increases at that position, so that the HfO2-like Hf-silicate layer is formed on top of the interfacial layer. The enhanced physical reactivity of the oxygen ions in the direct plasma and the Hf-silicate layer may be the driving forces that accelerate the early crystallization of the HfO2 layer in the DPALD process in the as-deposited state.
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