Y thin films by ultrashort pulsed laser deposition for photocathode application

Lorusso, A.; Giorgi, Maria Luisa De; Fotakis, C.; Maiolo, B.; Miglietta, P.; Papadopoulou, Evie L.; Perrone, A.

doi:10.1016/j.apsusc.2012.05.080

Cited by 10 publications

(9 citation statements)

References 19 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Therefore sub-ps lasers should be used for this metal even if the ablation and deposition rates are quite small. On the contrary, it was also found that the laser ablation, and thus deposition, of yttrium in the ns regime is by far more appropriate than ps and sub-ps regimes [29]. (2011) 090401-3 different magnifications.…”

Section: Resultsmentioning

confidence: 99%

Highlights on photocathodes based on thin films prepared by pulsed laser deposition

Lorusso

Gontad

Perrone

et al. 2011

Phys. Rev. ST Accel. Beams

Self Cite

View full text Add to dashboard Cite

We review the current status of metallic photocathodes based on thin films prepared by pulsed laser deposition (PLD) and we explore ways to improve the performance of these devices. PLD seems to be a very efficient and suitable technique for producing adherent and uniform thin films. Time-resolved mass spectrometric investigations definitively suggest that the deposition of high-purity metallic thin films should be carried out in ultrahigh vacuum systems and after a deep and careful laser cleaning of the target surface. Moreover, the laser cleaning of the target surface is highly recommended not only to remove the first contaminated layers but also to improve the quality of the vacuum by reducing the partial pressure of reactive chemical species as H 2 O, H 2 , and O 2 molecules. The challenge to realize high-purity Mg and Y thin films is very interesting for the photocathode R&D due to the good photoemission properties of these metals. Photocathodes based on Mg and Y thin films have been characterized by scanning electron microscopy and x-ray diffraction techniques to derive the morphological and structural features, respectively. They were also tested in a photodiode cell to deduce the photoelectron properties. The quantum efficiency of such photocathodes was systematically improved by in situ laser cleaning treatments of the surface in order to remove the contaminated layers reaching, in this way, the quantum efficiency of the corresponding bulk materials.

show abstract

Section: Resultsmentioning

confidence: 99%

Highlights on photocathodes based on thin films prepared by pulsed laser deposition

Lorusso

Gontad

Perrone

et al. 2011

Phys. Rev. ST Accel. Beams

Self Cite

View full text Add to dashboard Cite

show abstract

“…As evidenced, the increase in fluence to 3.3 J/cm 2 led to an approximately logarithmic increase in the average ablation rate of up to 33.2 ng/pulse. The fitting curve is described by the following equation [ 33 ]:

…”

Section: Resultsmentioning

confidence: 99%

“…The material evaporated per pulse at the ablation threshold, m(F th ) , depends on the optical and thermal properties of the target, as well as on the characteristics of the impinging laser radiation. Its value can be calculated through the following relation [ 33 ]:

which results in about 10.6 ng/pulse.…”

Section: Resultsmentioning

confidence: 99%

Sub-ps Pulsed Laser Deposition of Boron Films for Neutron Detector Applications

et al. 2023

View full text Add to dashboard Cite

In view of the demand for high-quality thermal neutron detectors, boron films have recently attracted widespread research interest because of their special properties. In this work, we report on the deposition of boron films on silicon substrates by sub-picosecond pulsed laser deposition (PLD) at room temperature. Particular emphasis was placed on the investigation of the effect of the laser energy density (fluence) on the ablation process of the target material, as well as on the morphological properties of the resulting films. In addition, based on the study of the ablation and deposition rates as a function of the fluence, the ablation/deposition mechanisms are discussed. We show that well-adherent and stable boron films, with good quality surfaces revealing a good surface flatness and absence of cracks, can be obtained by means of the PLD technique, which proves to be a reliable and reproducible method for the fabrication of thick boron coatings that are suitable for neutron detection technology.

show abstract

“…The physical process is affected by the laser parameters and experimental conditions. [17][18][19][20][21][22][23] The presence of droplets could affect the physical proper-ties and the potential applications of the films. Great efforts have been taken to reduce the size and the density of the droplets that cover on the surfaces of the as-deposited films.…”

Section: Introductionmentioning

confidence: 99%

Characterization of zirconium thin films deposited by pulsed laser deposition

Liu¹,

Jing-Ping²,

Wu-Peng³

et al. 2014

Chinese Phys. B

View full text Add to dashboard Cite

Zirconium (Zr) thin films deposited on Si (100) by pulsed laser deposition (PLD) at different pulse repetition rates are investigated. The deposited Zr films exhibit a polycrystalline structure, and the X-ray diffraction (XRD) patterns of the films show the α Zr phase. Due to the morphology variation of the target and the laser-plasma interaction, the deposition rate significantly decreases from 0.0431 Å/pulse at 2 Hz to 0.0189 Å/pulse at 20 Hz. The presence of droplets on the surface of the deposited film, which is one of the main disadvantages of the PLD, is observed at various pulse repetition rates. Statistical results show that the dimension and the density of the droplets increase with an increasing pulse repetition rate. We find that the source of droplets is the liquid layer formed under the target surface. The dense nanoparticles covered on the film surface are observed through atomic force microscopy (AFM). The root mean square (RMS) roughness caused by valleys and islands on the film surface initially increases and then decreases with the increasing pulse repetition rate. The results of our investigation will be useful to optimize the synthesis conditions of the Zr films.

show abstract

Y thin films by ultrashort pulsed laser deposition for photocathode application

Cited by 10 publications

References 19 publications

Highlights on photocathodes based on thin films prepared by pulsed laser deposition

Highlights on photocathodes based on thin films prepared by pulsed laser deposition

Sub-ps Pulsed Laser Deposition of Boron Films for Neutron Detector Applications

Characterization of zirconium thin films deposited by pulsed laser deposition

Contact Info

Product

Resources

About