Abstract
The local transverse photoconductivity of ultrathin (~4 nm) ZrO2(Y) films with embedded single-layer arrays of Au nanoparticles (~2 nm in diameter) is studied by conductive atomic force microscopy. The ZrO2(Y) films with Au nanoparticles are formed on glass substrates with transparent conductive indium-tin-oxide sublayers using layer-by-layer magnetron deposition followed by annealing. The peaks observed in the optical absorption spectra of the samples at the wavelength λ ≈ 660 nm are attributed to collective plasmon resonance in dense arrays of Au nanoparticles. The photocurrent between the microscope probe and the indium-tin-oxide sublayer is measured during photoexcitation of the contact between the probe and the sample surface through the transparent substrate by the radiation of a semiconductor laser diode at the plasmon-resonance wavelength. The increase in current through the probe of the atomic force microscope under photoexcitation is attributed to the photon-assisted emission of electrons from the Au nanoparticle into the conduction band of ZrO2(Y) in a strong electric field applied between the probe and the indium-tin-oxide sublayer under plasmon resonance conditions.
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ACKNOWLEDGMENTS
This work was supported by the Ministry of Education and Science of the Russian Federation (No. 16.7864.2017/BCh). When performing the work, equipment of the Center for Collective Use – Scientific-Educational Center “Physics of Solid-State Nanostructures” of National Research Lobachevsky State University of Nizhny Novgorod was used.
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Liskin, D.A., Filatov, D.O., Gorshkov, O.N. et al. Investigation of the Local Photoconductivity of ZrO2(Y) Films with Embedded Au Nanoparticles by Conductive Atomic Force Microscopy. J. Surf. Investig. 13, 424–428 (2019). https://doi.org/10.1134/S1027451019030133
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DOI: https://doi.org/10.1134/S1027451019030133