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Role of component layers in designing carbon nanotubes-based tandem absorber on metal substrates for solar thermal applications

Selvakumar, N and Biswas, A and Rao, SridharaDV and Krupanidhi, SB and Barshilia, Harish C (2016) Role of component layers in designing carbon nanotubes-based tandem absorber on metal substrates for solar thermal applications. In: SOLAR ENERGY MATERIALS AND SOLAR CELLS, 155 . pp. 397-404.

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Official URL: http://dx.doi.org/10.1016/j.solmat.2016.06.051

Abstract

Ti/Al2O3 coating was designed and developed for the growth of carbon nanotubes (CNTs)-based tandem absorber on stainless steel (SS) substrates. The aluminum and titanium target power densities and oxygen flow rates were optimized to deposit the Ti/Al2O3 coatings. The optimized Ti/Al2O3 coating with a Co catalyst on top was used as an underlying substrate to grow the CNT-based tandem absorber at 800 degrees C in Ar+H-2 atmosphere (i.e., SS/Ti/Al2O3/Co/CNT). The formation of aluminum titanium oxide (AlTiO) was observed during the CNT growth process and this layer enhances the optical properties of the CNT based tandem absorber. At 036 mu m CNT coating thickness, the tandem absorber exhibits an absorptance of 0.95 and an emittance of 0.20. The optical constants of Ti, Al2O3 and AITiO coatings were measured using phase modulated spectroscopic ellipsometry in the wavelength range of 300-900 nm. The experimentally measured ellipsometric parameters have been fitted with the simulated spectra using Tauc-Lorentz model for generating the dispersion of the optical constants of the Al2O3 and the AITiO layers. The Ti and Al2O3 layer thicknesses play a major role in designing CNT based tandem absorber with good optical properties. The transmission electron microscopy studies showed that the as-grown CNTs were multi walled in nature. The angular and the polarization dependence studies of the CNT based tandem absorber grown at different thicknesses were carried out using UV-VIS-NIR spectrophotometer. (C) 2016 Elsevier B.V. All rights reserved.

Item Type: Journal Article
Additional Information: Copy right for this article belongs to the ELSEVIER SCIENCE BV, PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
Department/Centre: Division of Chemical Sciences > Materials Research Centre
Depositing User: Id for Latest eprints
Date Deposited: 22 Oct 2016 09:15
Last Modified: 22 Oct 2016 09:15
URI: http://eprints.iisc.ac.in/id/eprint/54996

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