Alternative Technological Schemes and Processes for the Formation of Ruthenium-Based Multilevel Metallization Structures for ULSI
- Authors: Rogozhin A.E.1, Permiakova O.O.1, Smirnova E.A.1, Lomov A.A.1, Simakin S.G.2, Rudenko K.V.1
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Affiliations:
- Valiev Institute of Physics and Technology, RAS
- Yaroslavl Branch of Valiev Institute of Physics and Technology, RAS
- Issue: Vol 118, No 2 (2023): THEMED SECTION: FUNDAMENTAL PROBLEMS OF MULTILEVEL METALLIZATION SYSTEMS FOR ULTRA-LARGE INTEGRATED CIRCUITS
- Pages: 53-62
- Section: THEMED SECTION: FUNDAMENTAL SCIENTIFIC RESEARCH IN THE FIELD OF NATURAL SCIENCES
- URL: https://ogarev-online.ru/1605-8070/article/view/301094
- DOI: https://doi.org/10.22204/2410-4639-2023-118-02-53-62
- ID: 301094
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Full Text
Abstract
Ruthenium thin films were deposited by plasma enhanced atomic layer deposition (PEALD) using Ru(EtCp)2 and oxygen plasma on the modified silicon surface and SiO2/Si substrates. The substrate temperature has a significant impact on film growth. The GXRD and SIMS analysis have shown that at the substrate temperature T=375 °C there is a sharp change in the mechanisms of surface reactions, which leads to a change in the film composition from RuO2 at low temperatures to a pure Ru film at higher temperatures. This was confirmed by measurements of the electrical resistivity of Ru-based films. The lowest surface roughness ~1.5 nm was obtained at a film thickness of 29 nm deposited at 375 °C on a SiO2/Si-substrate. The measured resistivity of the Ru film was 18–19·μΩ∙ cm. Issues regarding the plasma-chemical etching of ruthenium and the spin-on of a low-k dielectric onto arrays of lines are taken into account.
About the authors
Alexander E. Rogozhin
Valiev Institute of Physics and Technology, RAS
Author for correspondence.
Email: rogozhin@ftian.ru
Russian Federation, 34 Nakhimovsky Ave., Moscow, 117218, Russia
Olga O. Permiakova
Valiev Institute of Physics and Technology, RAS
Email: o.permyakova@ftian.ru
Russian Federation, 34 Nakhimovsky Ave., Moscow, 117218, Russia
Elizaveta A. Smirnova
Valiev Institute of Physics and Technology, RAS
Email: smirnova@ftian.ru
Russian Federation, 34 Nakhimovsky Ave., Moscow, 117218, Russia
Andrey A. Lomov
Valiev Institute of Physics and Technology, RAS
Email: lomov@ftian.ru
Russian Federation, 34 Nakhimovsky Ave., Moscow, 117218, Russia
Sergei G. Simakin
Yaroslavl Branch of Valiev Institute of Physics and Technology, RAS
Email: simser@mail.ru
Russian Federation, 21 Universitetskaya Str., Yaroslavl, 150007, Russia
Konstantin V. Rudenko
Valiev Institute of Physics and Technology, RAS
Email: rudenko@ftian.ru
Russian Federation, 34 Nakhimovsky Ave., Moscow, 117218, Russia
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