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, Consiglio Nazionale delle Ricerche, Istituto di Struttura della Materia, Sede Secondaria di Montelibretti, Via Salaria km 29.300, 00015, Monterotondo Stazione, Roma, Italy; Dip. di Scienze di Base ed Applicate per l’Ingegneria, Univ. of Rome “La Sapienza”, Via A. Scarpa 14, 00161, Rome, Italy; ENEA, Centro Ricerche Frascati, Dipartimento Fusione e Tecnologie per la Sicurezza Nucleare, Via Enrico Fermi 45, 00044, Frascati, Roma, Italy; CNR-ISM, Consiglio Nazionale delle Ricerche, Istituto di Struttura della Materia, Sede Secondaria di Tito Scalo, Area Industriale – Contrada S. Loia, 85050, Tito Scalo, Potenza, Italy; Università di Roma “Tor Vergata”, Dipartimento di Scienze e Tecnologie Chimiche, Via della Ricerca Scientifica 1, 00133, Roma, Italy; CNR-INO, Consiglio Nazionale delle Ricerche, Istituto nazionale di ottica, Largo E. Fermi, 6, I-50125, Firenze, 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.


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

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

Citations: 25
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