On the role of micro-porosity in affecting the environmental stability of atomic/molecular layer deposited (ZnO) : A (Zn-O-C 6 H 4 -O) b films

Morteza Aghaee (Corresponding author), Janne Petteri Niemelä, Wilhelmus M.M. Kessels, Mariadriana Creatore

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Abstract

Atomic/molecular layer deposited (ALD/MLD) inorganic-organic thin films form a novel class of materials with tunable properties. In selected cases, hybrid materials are reported to show environmental instability, specifically towards moisture. In this article, we focus on zinc oxide/zincone multi-layers with the theoretical formula of (ZnO) a (Zn-O-C 6 H 4 -O) b . We show by means of ellipsometric porosimetry that micro-porosity in the range of 0.42 and 2 nm in the pristine zincone layer is responsible for its environmental degradation. During degradation, it is found that a relative micro-porosity content of 1.2 ± 0.1 vol% in the pristine zincone films evolves into micro-mesoporosity with a relative content of 39 ± 1 vol%. We also show that the micro-porosity in the zincone layer can be gradually suppressed when few cycles (a = 1-10) of ZnO are introduced. The resulting (ZnO) a (Zn-O-C 6 H 4 -O) b = 1 periodic multilayer is an environmentally stable film with a = 10. It is found that the suppressed micro-porosity is due to the development of continuous ZnO layers with a ≥ 10.

Original languageEnglish
Pages (from-to)3496-3505
Number of pages10
JournalDalton Transactions
Volume48
Issue number10
DOIs
Publication statusPublished - 14 Feb 2019

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