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In photovoltaic solar cells manufacturing process, system breaks are produced. Recycling improves the material profitability. In this sense, manufacturing of components with non-straight shapes is not feasible using traditional methods. The processing of these materials through Nd-YAG laser, allows manufacturing with any geometric shape. This work shows a study of solar cells cutting process with laser. First of all, it is necessary to carry out a parameter optimization in order to make an accurate material cutting. The microstructure of the cutting area and possible microcompositional changes were studied by scanning electronic miscroscopy (SEM) and X-ray analysis (EDX).En el proceso de fabricación de placas fotovoltaicas se producen roturas de las células solares, por tanto, el reciclaje es necesario para mejorar la rentabilidad de este proceso, además, la fabricación de piezas de formas curvas no es factible por los métodos tradicionales. El procesado de estos materiales mediante un láser de Nd-YAG, permitirá la fabricación en cualquier forma geométrica además del mejor aprovechamiento de las placas desechadas por estar rotas. El presente trabajo muestra un estudio del proceso de corte de placas solares con láser. En primer lugar se procede a la optimización de los parámetros necesarios para realizar el corte de este material. La microestructura de la zona de corte y los posibles cambios microcomposicionales que se hayan podido producir, se estudian mediante microscopía electrónica de barrido, con microanálisis de energías dispersivas de Rayos X.

In view of the new challenges that can arise in the next interplanetary missions, studies aimed at shedding light on the interpretation of acquired analytical signals are of high priority in planetary science. Among the suite of techniques used in this field, LIBS has gained ample acceptance after its successful demonstration in the Mars Science Laboratory rover. As a consequence, several planned missions to Mars integrate this technology due to its capability for the quantitative analysis of rocks, minerals, and soils. While LIBS is primarily an atomic spectroscopy tool, recent research has demonstrated that significant information concerning organic radicals in the plasma can be useful for identification of molecular solids such as polycyclic aromatic hydrocarbons. This work explores this application by studying atomic and molecular species generated in reactions within the plasma plume in a low pressure CO2 atmosphere of selected organic compounds of interest as possible chemical biosignatures – adenine, glycine, pyrene and urea. The study also involves mixtures of variable composition of the organic compounds with carbonate salts, a material that has been detected in the surroundings of the landing site of the Perseverance rover of the upcoming Mars 2020 mission. Important routes for the formation of C2 and CN radicals such as aromatic ring fragmentation and displacement reactions in the CO2 atmosphere are identified using correlation analysis of the signals associated with the several emitting species detected in the plasma. The notion that LIBS can complement organic analysis techniques is further developed with successful data for differentiation between the organic compounds, with limits of detection from 3 wt% to 14 wt% in the carbonate matrix. [ABSTRACT FROM AUTHOR]

The use of laser-induced breakdown spectrometry (LIBS) for the multielemental distribution of coating samples is discussed. Surface characterization was performed by monitoring plasma emission generated by a Q-switched Nd:YAG laser operating on the second harmonic wavelength at 532 nm. Samples analyzed by LIBS consisted of manganin coatings (Cu, Ni, and Mn) prepared on Si by pulsed laser deposition from a solid manganin target (Cu 86%, Ni 2%, Mn 12%). The thickness of the coating was ~50 nm. To improve both surface sensitivity and spectral detection, the laser beam was focused 5 mm above the sample surface. A total area of 5.6 mm x 3.5 mm was sampled with a lateral resolution of 375 [micro]m. For quantitative purposes, the data from the coated sample were compared with those obtained from a manganin standard. Significant differences in the stoichiometry of coatings as compared with the original sample were observed.