Diffusivity of Hydrogen in ZnO Single Crystal

Abstract:

Hydrogen diffusivity in ZnO (0001) single crystal was investigated using electrical resistometry and nuclear reaction analysis (NRA). ZnO crystals were covered with a thin Pd over-layer and electrochemically charged with hydrogen. The net concentration of hydrogen determined by NRA was found to be in a reasonable agreement with the value estimated from the transported charge using the Faradays law. The hydrogen diffusion coefficient in ZnO was estimated from in-situ electrical resistivity measurements. Moreover, NRA investigations revealed existence of a subsurface layer with very high concentration of hydrogen (up to 40 at.%). Typical surface modification observed on hydrogen loaded crystal by light microscope indicates hydrogen-induced plastic deformation realized by a slip in the c-direction. Open-volume defects introduced by hydrogen-induced plastic deformation trap diffusing hydrogen and cause an enhancement of hydrogen concentration in the deformed subsurface layer.

• Periodical: Defect and Diffusion Forum (Volumes 326-328)
• Pages: 459-464
• DOI: https://doi.org/10.4028/www.scientific.net/DDF.326-328.459
• Online since: April 2012
• Authors: Jakub Čížek, František Lukáč, Marián Vlček, Ivan Procházka, Franziska Traeger, Detlef Rogalla, Hans Werner Becker
• Keywords: Electrical Resistivity, Hydrogen, Nuclear Reaction Analysis, Zinc Oxide (ZnO)

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