This work reports the fabrication of Nb/Pb structures with an application as photocathode devices. The use of relatively low energy densities for the ablation of Nb with ultrashort pulses favors the reduction of droplets during the growth of the film. However, the use of laser fluences in this ablation regime results in a consequent reduction in the average deposition rate. On the other hand, despite the low deposition rate, the films present a superior adherence to the substrate and an excellent coverage of the irregular substrate surface, avoiding the appearance of voids or discontinuities on the film surface. Moreover, the low energy densities used for the ablation favor the growth of nanocrystalline films with a similar crystalline structure to the bulk material. Therefore, the use of low ablation energy densities with ultrashort pulses for the deposition of the Nb thin films allows the growth of very adherent and nanocrystalline films with adequate properties for the fabrication of Nb/Pb structures to be included in superconducting radiofrequency cavities.
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July 2016
Research Article|
May 05 2016
Fabrication of Nb/Pb structures through ultrashort pulsed laser deposition
Francisco Gontad;
Francisco Gontad
Dipartimento di Matematica e Fisica “E. De Giorgi,”
Università del Salento and Istituto Nazionale di Fisica Nucleare
, 73100 Lecce, Italy
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Antonella Lorusso;
Antonella Lorusso
a)
Dipartimento di Matematica e Fisica “E. De Giorgi,”
Università del Salento and Istituto Nazionale di Fisica Nucleare
, 73100 Lecce, Italy
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Argyro Klini;
Argyro Klini
Institute of Electronic Structure and Laser (IESL)
, Foundation for Research and Technology-Hellas (FORTH), 100 N. Plastira St., GR 70013 Heraklion, Crete, Greece
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Esteban Broitman;
Esteban Broitman
Thin Film Physics Division, IFM,
Linköping University
, 581-83 Linköping, Sweden
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Alessio Perrone;
Alessio Perrone
Dipartimento di Matematica e Fisica “E. De Giorgi,”
Università del Salento and Istituto Nazionale di Fisica Nucleare
, 73100 Lecce, Italy
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Costas Fotakis
Costas Fotakis
Institute of Electronic Structure and Laser (IESL)
, Foundation for Research and Technology-Hellas (FORTH), 100 N. Plastira St., GR 70013 Heraklion, Crete, Greece
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a)
Electronic mail: antonella.lorusso@le.infn.it
J. Vac. Sci. Technol. A 34, 041501 (2016)
Article history
Received:
March 04 2016
Accepted:
April 21 2016
Citation
Francisco Gontad, Antonella Lorusso, Argyro Klini, Esteban Broitman, Alessio Perrone, Costas Fotakis; Fabrication of Nb/Pb structures through ultrashort pulsed laser deposition. J. Vac. Sci. Technol. A 1 July 2016; 34 (4): 041501. https://doi.org/10.1116/1.4948529
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