Femtosecond laser treatments to tailor the optical properties of hafnium carbide for solar applications

Year: 2015

Authors: Sciti D., Silvestroni L., Trucchi D.M., Cappelli E., Orlando S., Sani E.

Autors Affiliation: CNR, Inst Sci & Technol Ceram, ISTEC, I-48018 Faenza, Italy; CNR, ISM, Montelibretti Sect, I-00015 Monterotondo, Italy; CNR, INO, Inst Struct Matter, Tito Scala Sect, I-85050 Tito Scab, PZ, Italy; Ist Nazl Ottica, CNR, I-50125 Florence, Italy.

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.

Journal/Review: SOLAR ENERGY MATERIALS AND SOLAR CELLS

Volume: 132      Pages from: 460  to: 466

More Information: The authors would like to thank the European Community for the financial support of the European Project E2PHEST2US \”Enhanced Energy Production of Heat and Electricity by a combined Solar Thermionic-Thermoelectric Unit System\”- GA 241270 in the framework of the Seventh Framework Program, topic \”Energy\”.
KeyWords: Solar absorbers, Ceramic; Hafnium carbide; Molybdenum disilicide; Patterning; Solar applications, Ultrashort pulses
DOI: 10.1016/j.solmat.2014.09.037

Citations: 41
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