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Evolution of stress and structure in Cu thin films
Author(s) -
Chocyk D.,
Zientarski T.,
Proszynski A.,
Pienkos T.,
Gladyszewski L.,
Gladyszewski G.
Publication year - 2005
Publication title -
crystal research and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0232-1300
DOI - 10.1002/crat.200410376
Subject(s) - thin film , materials science , microstructure , stress (linguistics) , composite material , substrate (aquarium) , diffraction , deposition (geology) , ultimate tensile strength , radius of curvature , curvature , optics , nanotechnology , geometry , mean curvature , paleontology , philosophy , linguistics , oceanography , physics , mathematics , mean curvature flow , sediment , geology , biology
Evolution of stresses developing in Cu thin films during and after deposition by thermal evaporation in UHV system is studied. Thin films were deposited on 100 µm thick Si substrate at room temperature. Deposition rates for the films were changed between 0.2 Å/s and 2.0 Å/s, while the total thickness was changed from 7.7 nm to 155 nm. Deformation analysis of crystalline lattice and microstructure was performed by x‐ray diffraction measurements (θ‐2θ scans, “sin 2 ψ” method). The surface morphology of film was studied by atomic force microscopy. The average stress in the films was determined by measuring the radius of curvature of samples. For thin films three stages of stress evolution (compressive, tensile and compressive) were we distinguished. This behavior is characteristic for materials with a Volmer‐Weber mode. A three‐dimensional molecular dynamics technique was applied for simulating the stress calculation during thin film growth. The results obtained from the simulation are consistent with the experimental results. (© 2005 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)