Design and fabrication of spectrally selective TiAlC/TiAlCN/TiAlSiCN/TiAlSiCO/TiAlSiO tandem absorber for higherature solar thermal power applications

Jyothi, J and Chaliyawala, H and Srinivas, G and Nagaraja, HS and Barshilia, Harish C (2015) Design and fabrication of spectrally selective TiAlC/TiAlCN/TiAlSiCN/TiAlSiCO/TiAlSiO tandem absorber for higherature solar thermal power applications. Solar Energy Materials and Solar Cells, 140. pp. 209-216. ISSN 09270248

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Abstract

A new nanostructured TiAlC/TiAlCN/TiAlSiCN/TiAlSiCO/TiAlSiO tandem absorber has been designed for high-temperature solar thermal power applications. The first three layers in this tandem act as an absorbing layer, whereas, TiAlSiCO and TiAlSiO act as semi-transparent and anti-reflecting layers. The tandem absorber was deposited on stainless steel substrates using a four-cathode reactive direct current unbalanced magnetron sputtering system. The composition and thicknesses of the individual component layers have been optimized by adjusting the reactive flow rate of C2H2, N2, O2, and also Al, Ti and Si target power densities to achieve high absorptance (0.961) and low emittance (0.07 at 82 °C). The reflectance data showed that the absorptance increases gradually with shift of reflectance minimum to higher wavelengths from first layer to last layer (i.e., TiAlC to TiAlSiO). The thickness of optimized tandem absorber was calculated from the cross-sectional field-emission scanning electron microscopy images and confirmed using transmission electron microscopy. The performance evaluation of the tandem absorber has been evaluated by heating it in air and vacuum under cycling conditions at different temperatures. These results showed that the tandem absorber was stable up to 325 °C in air for 400 h and up to 650 °C in vacuum for 100 h, thus demonstrating its suitability for high-temperature solar thermal power generation applications.

Item Type:	Article
Subjects:	CHEMISTRY AND MATERIALS > Chemistry and Materials (General) CHEMISTRY AND MATERIALS > Composite Materials SPACE SCIENCES > Solar Physics
Depositing User:	Mrs SK Pratibha
Date Deposited:	20 Jun 2018 10:24
Last Modified:	20 Jun 2018 10:24
URI:	http://nal-ir.nal.res.in/id/eprint/12836

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