Femtosecond double-pulse laser ablation and deposition of Co-doped ZnS thin films
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2020
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Abstract
Nanostructured thin films of Co-doped zinc sulfide were synthesized through femtosecond pulsed laser deposition. The scheme involved ablation of physically mixed Co and ZnS with pairs of ultrashort pulses separated in time in the 0-300 ps range. In situ monitorization of the deposition process was carried out through a simultaneous reflectivity measurement. The crystallinity of generated nanoparticles and the inclusion of Co in the ZnS lattice is demonstrated by transmission electron microscopy and energy dispersive X-ray microanalysis (TEM-EDX) characterization. Surface morphology, Raman response, and photoluminescence of the films have also been assessed. The role of interpulse temporal separation is most visible in the thickness of the films obtained at the same total fluence, with much thicker films deposited with short delays than with individual uncoupled pulses. The proportion of Co in the synthesized doped ZnS nanoparticles is found to be substantially lower than the original proportion, and practically independent on interpulse delay.
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© 2020 by the authors. Licensee MDPI,
This research was funded by the Spanish State Research Agency (AEI) and the European Regional Development (FEDER) through projects CTQ2016-75880-P-AEI/FEDER, PID2019-106125GB-I00/AEI/10.13039/50110001103 and PID2019-104124RB-I00/AEI/10.13039/501100011033, by MINECO through the Retos Project MAT2017-84385-R and by Banco Santander-UCM through project PR87/19-22613.