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Tuning ZnO nanorods photoluminescence through atmospheric plasma treatments
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Material Science.ORCID iD: 0000-0001-7475-6394
Department of Physics and Astronomy, University of Padova, Padova, Italy.
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Material Science.ORCID iD: 0000-0002-7893-7405
Department of Physics and Astronomy, University of Padova, Padova, Italy.
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2019 (English)In: APL Materials, ISSN 2166-532X, Vol. 7, no 8, article id 08111Article in journal (Refereed) Published
Abstract [en]

Room temperature atmospheric plasma treatments are widely used to activate and control chemical functionalities at surfaces. Here, we investigated the effect of atmospheric pressure plasma jet (APPJ) treatments in reducing atmosphere (Ar/1‰ H2 mixture) on the photoluminescence (PL) properties of single crystal ZnO nanorods (NRs) grown through hydrothermal synthesis on fluorine-doped tin oxide glass substrates. The results were compared with a standard annealing process in air at 300 °C. Steady-state photoluminescence showed strong suppression of the defect emission in ZnO NRs for both plasma and thermal treatments. On the other side, the APPJ process induced an increase in PL quantum efficiency (QE), while the annealing does not show any improvement. The QE in the plasma treated samples was mainly determined by the near band-edge emission, which increased 5–6 fold compared to the as-prepared samples. This behavior suggests that the quenching of the defect emission is related to the substitution of hydrogen probably in zinc vacancies (VZn), while the enhancement of UV emission is due to doping originated by interstitial hydrogen (Hi), which diffuses out during annealing. Our results demonstrate that atmospheric pressure plasma can induce a similar hydrogen doping as ordinarily used vacuum processes and highlight that the APPJ treatments are not limited to the surfaces but can lead to subsurface modifications. APPJ processes at room temperature and under ambient air conditions are stable, convenient, and efficient methods, compared to thermal treatments to improve the optical and surface properties of ZnO NRs, and remarkably increase the efficiency of UV emission.

Place, publisher, year, edition, pages
American Institute of Physics (AIP), 2019. Vol. 7, no 8, article id 08111
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Experimental Physics
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URN: urn:nbn:se:ltu:diva-75784DOI: 10.1063/1.5110984Scopus ID: 2-s2.0-85070766229OAI: oai:DiVA.org:ltu-75784DiVA, id: diva2:1347202
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Validerad;2019;Nivå 2;2019-08-30 (johcin)

Available from: 2019-08-30 Created: 2019-08-30 Last updated: 2019-08-30Bibliographically approved

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You, ShujieGhamgosar, PedramEnrichi, FrancescoVomiero, Alberto

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