Substrate Effects on the Growth Behavior of Atomic-Layer-Deposited Ru Thin Films Using RuO4 Precursor and N-2/H-2 Mixed Gas
- Authors
- An, Cheol Hyun; Jeon, Woojin; Kim, Sang Hyeon; Cho, Cheol Jin; Kwon, Dae Seon; Kim, Dong Gun; Lee, Woongkyu; Hwang, Cheol Seong
- Issue Date
- Sep-2019
- Publisher
- AMER CHEMICAL SOC
- Citation
- JOURNAL OF PHYSICAL CHEMISTRY C, v.123, no.36, pp.22539 - 22549
- Journal Title
- JOURNAL OF PHYSICAL CHEMISTRY C
- Volume
- 123
- Number
- 36
- Start Page
- 22539
- End Page
- 22549
- URI
- http://scholarworks.bwise.kr/ssu/handle/2018.sw.ssu/42532
- DOI
- 10.1021/acs.jpcc.9b03727
- ISSN
- 1932-7447
- Abstract
- The growth behaviors of atomic-layer-deposited (ALD) Ru thin films using the RuO4 precursor and N-2/H-2 mixed reduction gas on Ta2O5 thin-film/Si substrates were examined. The Ru films deposited on the Ta2O5 film showed a high growth rate (>0.3 nm/cycle) compared with other ALD Ru processes (similar to 00.05-0.1 nm/cycle) as well as the characteristic stepwise saturation of the growth rate with respect to the reduction gas (N-2/H-2) injection time. Detailed analyses revealed that the substrate-involved growth mechanism contributed the extraordinary behavior. The Ta2O5 substrate was reduced to Ta metal by the N-2/H-2 reduction gas, and the produced Ta atoms were diffused onto the Ru film surface during Ru growth. The proposed reaction mechanism did not significantly affect the electrical properties of the Ru thin film. The process with an exceptionally high growth rate of 0.37 nm/cycle showed a stable self-limited behavior and excellent step coverage, making it suitable for the mass production of the electrode material in a three-dimensional structure. The films showed similar to 23 mu Omega cm bulk resistivity, which could be maintained down to an extremely low thickness of similar to 2.5 nm. This is a highly promising result for its application to the top electrode of the dynamic random access memory (DRAM) capacitor with an similar to 10 nm design rule.
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Collections - College of Engineering > Department of Organic Materials and Fiber Engineering > 1. Journal Articles
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