Cobalt Metal ALD: Understanding the Mechanism and Role of Zinc Alkyl Precursors as Reductants for Low-Resistivity Co Thin Films
| العنوان: | Cobalt Metal ALD: Understanding the Mechanism and Role of Zinc Alkyl Precursors as Reductants for Low-Resistivity Co Thin Films |
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| المؤلفون: | Claudia Bock, Anjana Devi, Seán T. Barry, David Zanders, Ji Liu, Jorit Obenlüneschloß, Lukas Mai, Michael Nolan, Detlef Rogalla |
| المصدر: | Chemistry of Materials. 33:5045-5057 |
| بيانات النشر: | American Chemical Society (ACS), 2021. |
| سنة النشر: | 2021 |
| مصطلحات موضوعية: | chemistry.chemical_classification, Materials science, General Chemical Engineering, Inorganic chemistry, Oxide, chemistry.chemical_element, General Chemistry, Zinc, Substrate (electronics), Atomic layer deposition, chemistry.chemical_compound, chemistry, X-ray photoelectron spectroscopy, Materials Chemistry, Thin film, Cobalt, Alkyl |
| الوصف: | In this work, we report a new and promising approach towards the atomic layer deposition (ALD) of metallic Co thin films. Utilizing the simple and known CoCl2(TMEDA) (TMEDA = N,N,N’,N’-tetramethylethylenediamine) precursor in combination with the intramolecularly stabilized Zn aminoalkyl compound Zn(DMP)2 (DMP = dimethylaminopropyl) as auxiliary reducing agent, a thermal ALD process is developed that enables the deposition of Zn free Co thin films. ALD studies demonstrate the saturation behavior of both precursors, linearity in dependency of the applied number of cycles as well as investigations of the temperature dependency of film growth in a regime of 140 - 215 °C. While the process optimization is carried out on Si with native oxide, additional growth studies are conducted on Au and Pt substrates. This study is complemented by initial reactivity and suitability tests of several potential Zn alkyl reducing agents. For the CoCl2(TMEDA) - Zn(DMP)2 combination, these findings allow to propose a series of elemental reaction steps hypothetically leading to pure Co film formation in the ALD process whose feasibility are probed by a set of DFT calculations. The DFT results show that for reactions of the precursors in the gas phase and on Co(111) substrate surfaces, a pathway involving C-C coupling and diamine formation through reductive elimination of an intermediate Co(II) alkyl species is preferred. Co thin films with an average thickness of 10 - 25 nm obtained from the process are subjected to thorough analysis comprising AFM, SEM, RBS/NRA as well as depth profiling XPS. Resistivity measurements for ~ 22 nm thick films grown on a defined SiO2 insulator layer yield highly promising values in a range of 15 - 20 μΩ cm without any after treatment. |
| تدمد: | 1520-5002 0897-4756 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_________::652b66c28a4be175ac665c3da8001eb0 https://doi.org/10.1021/acs.chemmater.1c00877 |
| حقوق: | CLOSED |
| رقم الأكسشن: | edsair.doi...........652b66c28a4be175ac665c3da8001eb0 |
| قاعدة البيانات: | OpenAIRE |
Find this issue from the American Chemical Society | تدمد: | 15205002 08974756 |
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