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

Permalink: https://www.hzdr.de/publications/Publ-17844
Publ.-Id: 17844