Effect of Etchant Concentration on the Optical Properties and Surface Topography of MoO 3 Selective Solar Absorber Thin
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MRS Advances © 2020 Materials Research Society DOI: 10.1557/adv.2020.194
Effect of Etchant Concentration on the Optical Properties and Surface Topography of MoO3 Selective Solar Absorber Thin Films R. Akobaa,b,c,d, G. G. Welegergsa,b,e, M. Lulekaf, J Sackeya,b, N Naumana,b, B. M. Mothudif, Z Y Nurua,b,g, M Maazaa,b a UNESCO-UNISA African Chair in Nanosciences-Nanotechnology, University of South Africa, P.O Box 392, Pretoria- South Africa
b
Nanosciencess African Network (NANOAFNET), iThemba LABS-National Research Foundation, 1, Somerset West, P O Box 722, South Africa
c
Department of Physics, Busitema University, P O Box 236 Tororo, Ugand
d
e
f
Department of Physics, Islamic University in Uganda, P O Box 2555 Mbale, Uganda
Department of Chemistry, Debre Berhan University, P O Box 445, Debrebirhan-Ethiopia
Department of Physics, University of South Africa, Private Bag X90, Florida, 1710, South Africa
g
Future Leader-Africa Independent Researcher, College of Natural and Computational Science, Physics, Adigrat University, P O Box 50, Adigrat-Ethiopia
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
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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.
INTRODUCTION: Nowadays, energy is one of the most important essentials discussed by scientists and technologists, as it is central to nearly every major challenge and opportunity the world faces today [1]. But the problem of environmental pollution by greenhouse gases produced by rampant use of fossil fuels is still not fully solved [2]. This calls for urgent development of sustainable, efficient and clean energy conversion methods for power generation. Thermoelectric materials used directly to convert heat into electricity [3], [4] and selective solar absorbers, for concentrated solar power (CSP) [5] are attractive alternatives. Different materials, physical mechanisms, and design principles
have been exploited in the production of a solar-absorbing surface for CSP. The guiding principle is spectral selectivity; meaning a high absorptance in the solar spectral range; 0.3 and 3μm and low thermal emittance in the infrared (IR) range; 3 and 50μm [6]. Six designs of solar absorbers ha
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