Critical tuning of magnetron sputtering process parameters for optimized solar selective absorption of NiCrOx cermet coatings on aluminium substrate

Genetic algorithms used for the optimization of light-emitting diodes and solar thermal collectors

“…[13][14] The optical properties of the different materials were taken from the literature and UV-visible and IR ellipsometric measurements. 18,[22][23] The parameters considered for this optimization problem are P, H, f, r, t 1 and t 2 . There are two objective functions to maximize: f 1 =α and f 2 =1-ε.…”

“…[18][19] α represents the fraction of the solar spectrum that is effectively absorbed by the system. ε represents the fraction of the spectrum of a blackbody heated at 373 K that will escape the system (equivalent of thermal losses).…”

Multi-objective genetic algorithm for the optimization of a flat-plate solar thermal collector

“…We can apply now the multi-objective genetic algorithm to the optimization of a solar thermal collector. In a previous work by Gaouyat et al [14,15], a flat aluminium substrate with NiCrO x and anti-reflection (AR) coatings was studied with the objective of developing highperformance solar thermal collectors. The NiCrO x ceramic-metal (cermet) composite was chosen because of its high durability and attractive absorption/emission selectivity [7].…”

“…Many cermet materials such as Ni-Al 2 O 3 , Cr-Cr 2 O 3 , Al-AlN and Ni-NiO are known to be good candidates [10][11][12][13]. Thanks to a previous work by Gaouyat et al [14,15], Ni-NiCrO x was found to be an ideal candidate for solar absorber applications because of its various absorption mechanisms. In order to reach higher performances, cermets are always coupled with an anti-reflection layer in a tandem absorber system [16].…”

“…It was proven in a previous work that a structuration of the substrate can lead to a further increase of the absorption [17]. Indeed the use of a structured substrate, in synergy with a tandem bilayer, could relax the constraints of fine tuning of layer deposition parameters [14]. Therefore the effect of the structure has to be explored.…”