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

Growth mechanisms of multiscale, mound-like surface structures on titanium by femtosecond laser processing

“…[1][2][3][4][5] FLSP is applicable for a wide range of materials, including metals, [5][6][7][8][9] semiconductors, 10,11 polymers, [12][13][14] glass, 15,16 and ceramics. 17,18 The resulting micro/ nanostructures provide special surface properties with many potentially useful applications. These include optimizing optical absorption for photovoltaics 17,19,20 and photodiodes, 21,22 as well as altering wetting properties (superhydrophilic or superhydrophobic) for enhanced heat transfer, [23][24][25] self-cleaning surfaces, 26 and chemical sensors.…”

“…17,18 The resulting micro/ nanostructures provide special surface properties with many potentially useful applications. These include optimizing optical absorption for photovoltaics 17,19,20 and photodiodes, 21,22 as well as altering wetting properties (superhydrophilic or superhydrophobic) for enhanced heat transfer, [23][24][25] self-cleaning surfaces, 26 and chemical sensors. 27 FLSP on titanium (Ti) surfaces is of great interest, especially for biomedical applications.…”

Preliminary characterization of ST2G: Solar thermionic-thermoelectric generator for concentrating systems

“…An ideal solar radiation absorber has to be thermally and mechanically stable at high operating temperatures; its thermal conductivity has to be high to feed thermal energy to the thermionic layer avoiding a large temperature gradient; its electrical conductivity has to be as high as possible to allow a refilling of electrons towards the thermionic emitter without ohmic losses; its solar absorptance has to be as high as possible in the solar spectrum wavelengths from the UV, visible and in near IR range; its thermal emissivity at operating temperatures has to be as low as possible to reduce emission losses. In order to maximize the solar absorptance, a specific surface texturing of the absorber has been optimized by using femtosecond laser treatments, that resulted in an increase of absorber selectivity 4 . The formation of sub-micrometer periodic structures on the treated surface induces a remarkable enhancement of the solar absorptance, as described in 5,6 .…”

Improvement of solar absorbing property of Ni–Mo based thermal spray coatings by laser surface treatment

“…[2], spectral selective coatings were fabricated by laser sintering of tungsten nano and micro particles on stainless steel substrate under atmospheric pressure that showed solar absorptance of~0.90 at room temperature and the coatings remain stable after heat treatment at 650 C in air for 36 h. It was also found in Ref. [20] that the absorbance-over-emittance ratio of the composite 70vol.%HfC-30vol.%MoSi 2 increased from about 1.8 to 2.1 by use of specific femtosecond laser interaction and patterning parameters.…”