Oxidation State Discrimination in the Atomic Layer Deposition of Vanadium Oxides
- Illinois Inst. of Technology, Chicago, IL (United States). Dept. of Chemistry; Argonne National Lab. (ANL), Argonne, IL (United States). Materials Science Div.
- Argonne National Lab. (ANL), Argonne, IL (United States). Materials Science Div.
- Northwestern Univ., Evanston, IL (United States). Dept. of Materials Science and Engineering and Dept. of Chemistry
- Argonne National Lab. (ANL), Argonne, IL (United States). Center for Nanoscale Materials
- Illinois Inst. of Technology, Chicago, IL (United States). Dept. of Chemistry; Argonne National Lab. (ANL), Argonne, IL (United States). Chemical Sciences and Engineering Div.
We describe the use of a vanadium 3+ precursor for atomic layer deposition (ALD) of thin films that span the common oxidation states of vanadium oxides. Self-limiting surface synthesis of V2O3, VO2, and V2O5 are realized via four distinct reaction mechanisms accessed via judicious choice of oxygen ALD partners. In situ quartz crystal microbalance and quadrupole mass spectrometry were used to study the reaction mechanism of the vanadium precursor with O3, H2O2, H2O/O2, and H2O2/H2. A clear distinction between non-oxidative protic ligand exchange and metal oxidation is demonstrated through sequential surface reactions with different non-metal precursors. This synergistic effect, provides greater control of the resultant metal species in the film, as well as reactive surface species during growth. In an extension of this approach, we introduce oxidation state control through reducing equivalents of H2 gas. When H2 is dosed after H2O2 during growth, amorphous films of VO2 are deposited that are readily crystallized with a low temperature anneal. These VO2 films show a temperature dependent Raman spectroscopy response in the expected range and consistent with the well-known phase-change behavior of VO2.
- Research Organization:
- Argonne National Lab. (ANL), Argonne, IL (United States); Energy Frontier Research Centers (EFRC) (United States). Argonne-Northwestern Solar Energy Research Center (ANSER)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- Grant/Contract Number:
- AC02-06CH11357
- OSTI ID:
- 1393545
- Journal Information:
- Chemistry of Materials, Vol. 29, Issue 15; ISSN 0897-4756
- Publisher:
- American Chemical Society (ACS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
Dynamic structural colour using vanadium dioxide thin films
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journal | May 2018 |
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