Hydrogen interaction with defects in ZnO
Hydrogen interaction with defects in ZnO
Lukac, F.; Cizek, J.; Vlcek, M.; Prochazka, I.; Vlach, M.; Anwand, W.; Brauer, G.; Traeger, F.; Rogalla, D.; Becker, H.-W.; Wagner, S.; Uchida, H.; Bähtz, C.
In the present work hydrothermally grown ZnO single crystals were electrochemically charged with hydrogen. The influence of hydrogen on ZnO microstructure was investigated by positron annihilation spectroscopy (PAS) combined with X-ray diffraction (XRD) using synchrotron radiation. Hydrogen concentration in the samples was determined by nuclear reaction analysis (NRA). It was found that a high concentration of hydrogen can be introduced into ZnO by electrochemical loading. At low concentrations absorbed hydrogen causes elastic volume expansion of ZnO crystal. At higher concentration, hydrogen-induced stresses exceed the yield stress in ZnO and plastic deformation of the crystal takes place leading to formation a defected subsurface layer in the crystals.
Keywords: zinc oxide; hydrogen defects; positron annihilation spectroscopy
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Materials Science Forum 733(2013), 228-231
DOI: 10.4028/www.scientific.net/MSF.733.228
Cited 4 times in Scopus
Permalink: https://www.hzdr.de/publications/Publ-17844
Publ.-Id: 17844