High temperature x-ray scattering studies of atomic layer deposited IrO2

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http://hdl.handle.net/10138/314719

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Heikkilä , M J , Hämäläinen , J , Puukilainen , E , Leskelä , M & Ritala , M 2020 , ' High temperature x-ray scattering studies of atomic layer deposited IrO2 ' , Journal of Applied Crystallography , vol. 53 , pp. 369-380 . https://doi.org/10.1107/S1600576720001053

Title: High temperature x-ray scattering studies of atomic layer deposited IrO2
Author: Heikkilä, Mikko J.; Hämäläinen, Jani; Puukilainen, Esa; Leskelä, Markku; Ritala, Mikko
Contributor: University of Helsinki, Department of Chemistry
University of Helsinki, Department of Chemistry
University of Helsinki, Department of Chemistry
University of Helsinki, Department of Chemistry
University of Helsinki, Department of Chemistry
Date: 2020-04-01
Language: eng
Number of pages: 12
Belongs to series: Journal of Applied Crystallography
ISSN: 0021-8898
URI: http://hdl.handle.net/10138/314719
Abstract: IrO2 is an important material in numerous applications ranging from catalysis to the microelectronics industry, but despite this its behaviour upon annealing under different conditions has not yet been thoroughly studied. This work provides a detailed investigation of the annealing of IrO2 thin films using in situ high-temperature X-ray diffraction and X-ray reflectivity (HTXRR) measurements from room temperature up to 1000 degrees C in oxygen, nitrogen, forming gas and vacuum. Complementary ex situ scanning electron microscopy and atomic force microscopy measurements were conducted. The combined data show the dependencies of crystalline properties and surface morphology on the annealing temperature and atmosphere. The reduction of IrO2 to Ir takes place at a temperature as low as 150 degrees C in forming gas, but in oxygen IrO2 is stable up to 800 degrees C and evaporates as a volatile oxide at higher temperatures. The IrO2 crystallite size remains constant in oxygen up to 400 degrees C and increases above that, while in the more reducing atmospheres the Ir crystallites grow continuously above the phase-change temperature. The role of HTXRR in the analysis is shown to be important since its high sensitivity allows one to observe changes taking place in the film at temperatures much below the phase change.
Subject: 116 Chemical sciences
IrO2
atomic layer deposition
ALD
high-temperature X-ray diffraction
HTXRD
high-temperature X-ray reflectivity
HTXRR
CHEMICAL-VAPOR-DEPOSITION
OXIDE THIN-FILMS
IRIDIUM-OXIDE
THERMAL-STABILITY
NOBLE-METALS
REFLECTIVITY
EVOLUTION
TEMPERATURE
ELECTRODES
ELECTROCATALYSIS
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