Hydrogen absorption in thin ZnO films prepared by pulsed laser deposition

0431501 - FZÚ 2015 RIV NL eng J - Journal Article
Melikhova, O. - Čížek, J. - Lukáč, F. - Vlček, M. - Novotný, Michal - Bulíř, Jiří - Lančok, Ján - Anwand, W. - Brauer, G. - Connolly, J. - McCarthy, E. - Krishnamurthy, S. - Mosnier, J.-P.
Hydrogen absorption in thin ZnO films prepared by pulsed laser deposition.
Journal of Alloys and Compounds. Roč. 580, suppl. 1 (2013), S40-S43. ISSN 0925-8388. E-ISSN 1873-4669
R&D Projects: GA ČR(CZ) GAP108/11/0958
Institutional support: RVO:68378271
Keywords : defects * hydrogen * positron annihilation * thin films * ZnO
Subject RIV: BM - Solid Matter Physics ; Magnetism
Impact factor: 2.726, year: 2013

ZnO films with thickness of ~80 nm were grown by pulsed laser deposition (PLD) on MgO (1 0 0) single crystal and amorphous fused silica (FS) substrates. Structural studies of ZnO films and a high quality reference ZnO single crystal were performed by slow positron implantation spectroscopy (SPIS). It was found that ZnO films exhibit significantly higher density of defects than the reference ZnO crystal. Moreover, the ZnO film deposited on MgO substrate exhibits higher concentration of defects than the film deposited on amorphous FS substrate most probably due to a dense network of misfit dislocations. The ZnO films and the reference ZnO crystal were subsequently loaded with hydrogen by electrochemical cathodic charging. SPIS characterizations revealed that absorbed hydrogen introduces new defects into ZnO.
Permanent Link: http://hdl.handle.net/11104/0236109