Femtosecond double-pulse laser ablation and deposition of Co-doped ZnS thin films

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 c...

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Bibliographic Details
Authors: López Quintas, Ignacio, Rebollar, Esther, Ávila Brande, David, Izquierdo, Jesús G., Díaz-Guerra Viejo, Carlos, Urbieta Quiroga, Ana Irene, Castillejo, Marta, Nalda, Rebeca de, Martín Fernández, Margarita
Format: article
Publication Date:2020
Country:España
Institution:Universidad Complutense de Madrid (UCM)
Repository:Docta Complutense
Language:English
OAI Identifier:oai:docta.ucm.es:20.500.14352/7637
Online Access:https://hdl.handle.net/20.500.14352/7637
Access Level:Open access
Keyword:538.9
Diluted magnetic semiconductor
Room-temperature ferromagnetism
Spectroscopy
Dynamics
Photoluminescence
Emission
Phase
Ultrashort laser pulses
Double pulse irradiation
Pulsed laser deposition
thin films
Nanoparticles
Diluted magnetic semiconductors
II-VI semiconductors
Transition metal doping
Cobalt
Zinc sulfide
Física de materiales
Física del estado sólido
2211 Física del Estado Sólido
Description
Summary: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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