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Modification of structure and surface morphology in various ZnO facets via low fluence gold swift heavy ion irradiation

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    0536516 - ÚJF 2022 RIV US eng J - Journal Article
    Jagerová, Adéla - Malinský, Petr - Mikšová, Romana - Lálik, Ondřej - Cutroneo, Mariapompea - Romanenko, Olexandr V. - Szokolova, K. - Sofer, Z. - Slepička, P. - Čízek, J. - Macková, Anna
    Modification of structure and surface morphology in various ZnO facets via low fluence gold swift heavy ion irradiation.
    Surface and Interface Analysis. Roč. 53, č. 2 (2021), s. 230-243. ISSN 0142-2421
    R&D Projects: GA MŠk LM2015056; GA MŠk EF16_013/0001812; GA ČR GA18-03346S
    Institutional support: RVO:61389005
    Keywords : single ion irradiation * swift heavy-ion irradiation * ZnO nanostructuring
    Subject RIV: BG - Nuclear, Atomic and Molecular Physics, Colliders
    OBOR OECD: Atomic, molecular and chemical physics (physics of atoms and molecules including collision, interaction with radiation, magnetic resonances, Mössbauer effect)
    Impact factor: 1.665, year: 2019

    The influence of low fluence high-energy ion irradiation on the modification of the ZnO surface structure and optical properties has been studied. ZnO samples of various orientations, namely, c-plane (0001), a-plane (11-20) and m-plane (10-10), have been implanted with 30-MeV Au ions with fluences ranging from 5 x 10(9) to 5 x 10(11) cm(-2). Rutherford backscattering spectrometry in the channelling mode (RBS-C) and Raman spectroscopy has shown the distinct damage accumulation in the irradiated surface layer about 1 mu m depending on the ZnO facet being to larger extent evidenced in the m-plane ZnO. Contrary, the a-plane ZnO has been exhibited the lowest Zn disorder. Using atomic force microscopy (AFM), a complex morphology was detected on the irradiated samples containing grains and exhibiting increased roughness, both growing with the Au implantation fluence mainly in m-plane ZnO. Positron annihilation spectroscopy (PAS) has shown distinct defect accumulation at the Au-ion fluence of 5 x 10(11) cm(-2), where RBS-C and Raman spectroscopy indicated sudden disorder increase in the irradiated layers, probably the creation of more complex clusters of Zn and O vacancies 4VZn + 8VO initiated in connection with an overlap of individual ion impacts. Photoluminescence measurements have shown a distinct near-band-edge (NBE) luminescence, developing with the increasing Au-ion fluence in various ZnO orientations. The m-plane ZnO had the most progressively suppressed NBE in comparison with the other orientations.
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