Investigation of Surface Nanoclusters and Paramagnetic Centers of ZnO/Por-Si Structures as the Basis of Sensory Properties
Murzalinov D. Seredavina T. Kemelbekova A. Spivak Y. Moshnikov V. Mukhamedshina D. Mit’ K. Ussipov N. Dmitriyeva E. Zhantuarov S. Ibraimova S. Aimaganbetov K. Bondar E. Fedosimova A.
December 2023Multidisciplinary Digital Publishing Institute (MDPI)
Processes
2023#11Issue 12
The detection of particles with uncompensated charge and the determination of the features of their interaction during the formation of nanocrystals on substrates with a developed surface are an interesting area of research. The porous surface formed via the electrochemical etching of silicon acquired fractal properties as a result of the deposition of zinc oxide layers. Microscopy methods using different resolutions revealed a hierarchical structure of the surface, where each of the three consecutive levels contains uniformly distributed formations. The deposition of 20 layers of ZnO maximizes the concentration of nanocrystals at the pore boundaries, while the deposition of 25 layers leads to the formation of a continuous layer. The increase in photoluminescence intensity with an increase in the number of deposited layers is due to the saturation of surface nanostructures with electrons through several mechanisms. Electron paramagnetic resonance (EPR) studies have shown that the main mechanism of radiation recombination is the capture of electrons on oxygen vacancies. The different nature of the EPR saturation of the signal of interconnected paramagnetic centers revealed the formation of zinc oxide particles at the boundaries of pores with different sizes. The results of these studies of surface-active structures effectively complement the knowledge about sensory materials.
capture of electrons , electrochemical etching , electron paramagnetic resonance , levels of porosity , light-emitting clusters , oxygen vacancies , photoluminescence , saturation of structures with electrons , saturation of the EPR signal , ZnO coating deposition
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Institute of Physics and Technology, Satbayev University, Almaty, 050013, Kazakhstan
Microelectronics Department, Saint-Petersburg State Electrotechnical University, Professora Popova Street, Saint-Petersburg, 197376, Russian Federation
Department of Solid State Physics and Nonlinear Physics, Al-Farabi Kazakh National University, Almaty, 050040, Kazakhstan
Institute of Physics and Technology
Microelectronics Department
Department of Solid State Physics and Nonlinear Physics
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