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

被引:2
作者
Heikkila, Mikko J. [1 ]
Hamalainen, Jani [1 ,2 ]
Puukilainen, Esa [1 ,3 ]
Leskela, Markku [1 ]
Ritala, Mikko [1 ]
机构
[1] Univ Helsinki, Dept Chem, POB 55,AI Virtasen Aukio 1, FIN-00014 Helsinki, Finland
[2] Picosun Oy, Masalantie 365, Masala 02430, Finland
[3] Vauhti Speed Oy, Pamilonkatu 9, Joensuu 80100, Finland
来源
JOURNAL OF APPLIED CRYSTALLOGRAPHY | 2020年 / 53卷
关键词
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;
D O I
10.1107/S1600576720001053
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
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.
引用
收藏
页码:369 / 380
页数:12
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