This paper focuses on the research and development of a suitable method for creating a selective emitter for the visible and near-infrared region to be able to work optimally together with silicon photovoltaic cells in a thermophotovoltaic system. The aim was to develop a new method to create very fine structures beyond the conventional standard (nanostructures), which will increase the emissivity of the base material for it to match the needs of a selective emitter for the VIS and NIR region. Available methods were used to create the nanostructures, from which we eliminated all unsuitable methods; for the selected method, we established the optimal procedure and parameters for their creation. The development of the emitter nanostructures included the necessary substrate pretreatments, where great emphasis was placed on material purity and surface roughness. Tungsten was purposely chosen as the main material for the formation of the nanostructures; we verified the effect of the formed structure on the resulting emissivity. This work presents a new method for the formation of nanostructures, which are not commonly formed in such fineness; by this, it opens the way to new possibilities for achieving the desired selectivity of the thermophotovoltaic emitter.

Central European Institute of Technology Brno University of Technology Purkyňova 656 123 612 00 Brno Czech Republic

Department of Electrical and Electronic Technology Faculty of Electrical Engineering and Communication Brno University of Technology Technická 3058 10 616 00 Brno Czech Republic

Department of Microelectronics Faculty of Electrical Engineering and Communication Brno University of Technology Technická 3058 10 616 00 Brno Czech Republic

Department of Physics Faculty of Electrical Engineering and Communication Brno University of Technology Technická 3058 8 616 00 Brno Czech Republic

Institute of Scientific Instruments of the Czech Academy of Sciences Královopolská 147 612 64 Brno Czech Republic

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