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The effect of nature and pressure of ambient environment on laser-induced breakdown spectroscopy and ablation mechanisms of Si

Published online by Cambridge University Press:  09 August 2017

K. Zehra ,
S. Bashir ,
S.A. Hassan ,
Q.S. Ahmed ,
M. Akram  and
A. Hayat
K. Zehra
Affiliation:
Centre for Advanced Studies in Physics, Govt. College University, Lahore 54000, Pakistan
S. Bashir
Affiliation:
Centre for Advanced Studies in Physics, Govt. College University, Lahore 54000, Pakistan
S.A. Hassan*
Affiliation:
Department of Energy Materials and Telecommunication, Institut national de la recherche scientifique (INRS), Québec, Canada
Q.S. Ahmed
Affiliation:
Centre for Advanced Studies in Physics, Govt. College University, Lahore 54000, Pakistan Department of Electrical Engineering, Information Technology University (ITU), Lahore 54000, Pakistan
M. Akram
Affiliation:
Centre for Advanced Studies in Physics, Govt. College University, Lahore 54000, Pakistan
A. Hayat
Affiliation:
Centre for Advanced Studies in Physics, Govt. College University, Lahore 54000, Pakistan
*
Address correspondence and reprint requests to: S.A. Hassan, Department of Energy Material and Telecommunication, Institut national de la recherche scientifique (INRS), 1650, boulevard Lionel-Boulet Varennes (Québec) J3X 1S2, Canada. E-mail: [email protected]
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Abstract

The effect of nature and pressure of ambient environment on laser-induced breakdown spectroscopy (LIBS) and ablation mechanisms of silicon (Si) have been investigated. A Q-switched Nd-YAG laser with the wavelength of 1064 nm, pulse duration of 10 ns, and pulsed energy of 50 mJ was employed. Si targets were exposed under ambient environments of inert gases of argon, neon, and helium for different pressures ranging from 5 to 760 torr. The influence of nature and pressure of ambient gases on the emission intensity of Si plasma have been explored by using the LIBS spectrometer system. The plasma parameters such as electron temperature and number density were determined by applying Boltzmann plot and Stark broadening method, respectively. Our experimental results suggest that the nature and pressure of ambient environment play a significant role for generation, recombination, and expansion of plasma and consequently affect the excitation temperature as well as electron density of plasma. The surface morphological analysis of laser-irradiated Si was performed by using scanning electron microscope (SEM). Various kinds of structures, for example laser-induced periodic surface structures or ripples, cones, droplets, and craters have been generated and their density and size are found to be strongly dependent upon the ambient environment. A quantitative analysis of particulate size and crater depth measured from SEM images showed a strong correlation between plasma parameters and the growth of micro/nanostructures on the modified Si surface.

Keywords

SiliconLaser-induced breakdown spectroscopyEmission spectroscopySurface morphologyPeriodic surface structures
Type
Research Article
Information
Laser and Particle Beams , Volume 35 , Issue 3 , September 2017 , pp. 492 - 504
Copyright
Copyright © Cambridge University Press 2017 

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