Enhanced selective solar absorption of surface nanotextured semi-insulating 6H–SiC

Year: 2020

Authors: Mastellone M., Bellucci A., Girolami M., Montereali R.M., Orlando S., Polini R., Serpente V., Sani E., Valentini V., Vincenti MA., Trucchi D.M.

Autors Affiliation: CNR, ISM, Ist Struttura Mat, Sede Secondaria Montelibretti, Via Salaria Km 29-300, I-00015 Rome, Italy; Univ Rome Ls Sapienza, Dip Sci Base & Applicate Ingn, Via A Scarpa 14, I-00161 Rome, Italy; ENEA, Ctr Ric Frascati, Dipartimento Fus & Tecnol Sicurezza Nucl, Via Enrico Fermi 45, I-00044 Rome, Italy; CNR, ISM, Ist Struttura Mat, Sede Secondaria Tito Scalo, I-85050 Potenza, Italy; Univ Roma Tor Vergata, Dipartimento Sci & Tecnol Chim, Via Ric Sci 1, I-00133 Rome, Italy; CNR, INO, Ist Nazl Ott, Largo E Fermi 6, I-50125 Florence, Italy.

Abstract: Surface treatments were performed on single-crystal semi-insulating 6H–SiC by femtosecond pulsed laser irradiation, aimed at analyzing the effect of the laser-induced periodic surface structures (LIPSSs) on the films’ optical properties. The surface morphology study of the laser-induced nanostructures allows determining the modification threshold fluence of about 0.7 J cm-2 as well as detecting fine (160 nm) and coarse (450–550 nm) ripples according to different values of the laser pulse fluence (ΦP) released to the material. Micro-Raman spectroscopy allows determining the presence of undesired amorphous structural phases when ΦP exceeds 2.15 J cm-2, whereas no compositional variations occur for lower values of ΦP. Samples treated on the entire surface with the pulse fluence conditions to obtain fine ripples were optically tested. Although the long-range order is progressively lost as the accumulated laser fluence increases, the heaviest treated samples show solar absorptance values > 75% and spectral selectivity up to 1.7 projected at the operating temperature of 1000 K, thus pointing out the suitability of fs-laser surface textured 6H–SiC to act as a selective solar absorber for energy conversion devices operating at high temperature.

Journal/Review: OPTICAL MATERIALS

Volume: 107      Pages from: 109967-1  to: 109967-8

KeyWords: Silicon carbide;
Optical properties;
Laser;
Surface texturing;
Solar absorbers;
Spectral selectivity;
DOI: 10.1016/j.optmat.2020.109967

Citations: 27
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