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Conducting ceramics based on ZnO co-doped by (Al, Ti, Mg) : microstructure, electronic active defects and electrical properties

Abstract : ZnO based ceramics with appropriate doping elements show excellent electrical and optical properties such as high exciton binding energies, a modulated optical transparency and high electrical conductivities. Therefore, ZnO based conducting ceramics have been extensively investigated in the aim of their application as resistors, visitors, gas sensors, transparent electrodes, solar cell windows, piezoelectric, electro-optical and thermoelectric devices. The high conductivity of ZnO ceramics up to 0.1MS·m-1 is closely related to the doping elements along with the ceramic microstructure and the processing conditions with particular effects of grain boundaries, crystalline structure and structural disorder within the ceramics. Thus, the present thesis is devoted to the fabrication by sintering under defined conditions (sintering atmospheres, processes) of ZnO based ceramics co-doped by (Al, Ti, Mg) , the investigations and deep analysis of their related properties including crystalline structure, micro-structure and the electrical behavior. Exhaustive studies were developed on the doped ceramics by using structural methods (XRD, Raman), microscopy (TEM, SEM) and magnetic resonance (EPR, NMR) probing the local order and electronic active defects. The conductivity is adjusted by the nature of the structure influenced by the doping elements, the sintering atmosphere, and the sintering method. The correlation "Preparation - Structure - Conductivity" has been established to pave the way for the potential technological applications of highly conducting ZnO-based ceramics.
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Submitted on : Friday, September 4, 2020 - 12:46:19 PM
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Qianying Sun. Conducting ceramics based on ZnO co-doped by (Al, Ti, Mg) : microstructure, electronic active defects and electrical properties. Materials. Université du Maine; Institute of ceramics (Shanghai, Chine), 2020. English. ⟨NNT : 2020LEMA1014⟩. ⟨tel-02930311⟩

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