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Effect of Etchant Concentration on the Optical Properties and Surface Topography of MoO3 Selective Solar Absorber Thin Films

Published online by Cambridge University Press:  13 April 2020

R. Akoba*
Affiliation:
UNESCO-UNISA African Chair in Nanosciences-Nanotechnology, University of South Africa, P.O Box 392, Pretoria- South Africa Nanosciencess African Network (NANOAFNET), iThemba LABS-National Research Foundation, 1, Somerset West, P O Box 722, South Africa Department of Physics, Busitema University, P O Box 236 Tororo, Ugand Department of Physics, Islamic University in Uganda, P O Box 2555 Mbale, Uganda
G. G. Welegergs
Affiliation:
UNESCO-UNISA African Chair in Nanosciences-Nanotechnology, University of South Africa, P.O Box 392, Pretoria- South Africa Nanosciencess African Network (NANOAFNET), iThemba LABS-National Research Foundation, 1, Somerset West, P O Box 722, South Africa Department of Chemistry, Debre Berhan University, P O Box 445, Debrebirhan-Ethiopia
M. Luleka
Affiliation:
Department of Physics, University of South Africa, Private Bag X90, Florida, 1710, South Africa
J Sackey
Affiliation:
UNESCO-UNISA African Chair in Nanosciences-Nanotechnology, University of South Africa, P.O Box 392, Pretoria- South Africa Nanosciencess African Network (NANOAFNET), iThemba LABS-National Research Foundation, 1, Somerset West, P O Box 722, South Africa
N Nauman
Affiliation:
UNESCO-UNISA African Chair in Nanosciences-Nanotechnology, University of South Africa, P.O Box 392, Pretoria- South Africa Nanosciencess African Network (NANOAFNET), iThemba LABS-National Research Foundation, 1, Somerset West, P O Box 722, South Africa
B. M. Mothudi
Affiliation:
Department of Physics, University of South Africa, Private Bag X90, Florida, 1710, South Africa
Z Y Nuru
Affiliation:
UNESCO-UNISA African Chair in Nanosciences-Nanotechnology, University of South Africa, P.O Box 392, Pretoria- South Africa Nanosciencess African Network (NANOAFNET), iThemba LABS-National Research Foundation, 1, Somerset West, P O Box 722, South Africa Future Leader-Africa Independent Researcher, College of Natural and Computational Science, Physics, Adigrat University, P O Box 50, Adigrat-Ethiopia
M Maaza
Affiliation:
UNESCO-UNISA African Chair in Nanosciences-Nanotechnology, University of South Africa, P.O Box 392, Pretoria- South Africa Nanosciencess African Network (NANOAFNET), iThemba LABS-National Research Foundation, 1, Somerset West, P O Box 722, South Africa
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Abstract

A novel technique providing a cost effective sustainable wet chemical etching method of synthesizing black Moly thin films rapidly has been presented. A top- down method for fabricating MoO3 has been investigated to understand the effect of chemical etchant concentration on the structural, morphological and optical properties of the thin films on Mo substrates. The XRD patterns demonstrated the formation of Tugarinovite MoO2 films on Mo substrate after annealing at 500°C in a vacuum. In this work, we developed nanostructured MoO3 on Mo substrate solar absorber, with a high solar absorptance of over 89%. These results suggest that solar absorbers made from refractory metal oxide nanostructures can be used for solar thermal applications.

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Articles
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Copyright © Materials Research Society 2020

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