Femtosecond laser treatments to tailor the optical properties of hafnium carbide for solar applications
Source abstract
Abstract
HfC-based materials are promising composites for application as solar absorbers. Being a ceramic with some metallic character, HfC shows intrinsic spectral selectivity, but quite a high reflectance at the wavelengths of the Sun spectrum. In this work, a femtosecond laser treatment has been specifically tailored to increase the solar absorbance of a composite 70 vol% HfC-30 vol%MoSi2. We investigated the morphological surface changes induced by the femtosecond laser on both phases, proposing a mechanism for surface modifications on the basis of microstructural analysis. Despite the presence of two ceramic phases with different physical properties, the laser was able to modify both phases simultaneously upon specific parameters. The effect of the surface texturing on the optical spectrum was analyzed. By use of specific laser interaction and patterning parameters, the formation of a regular surface pattern allowed the absorbance-over-emittance ratio to be increased from about 1.8 to 2.1. (C) 2014 Elsevier B.V. All rights reserved.
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Research context
OpenAlex topics: Silicon and Solar Cell Technologies · Thin-Film Transistor Technologies · Silicon Nanostructures and Photoluminescence
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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