Laser ablation of AgSbS2 and cluster analysis by time‐of‐flight mass spectrometry |
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Authors: | Jan Hou?ka Eladia Maria Peña‐Méndez Jakub Kolá? Miloslav Frumar Tomá? Wágner Josef Havel |
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Institution: | 1. Department of Chemistry, Faculty of Science, Masaryk University, Kotlá?ská 2, 611 37 Brno, Czech Republic;2. Department of Analytical Chemistry, Food and Food Science, Faculty of Chemistry, University of La Laguna, La Laguna, Tenerife 38071, Spain;3. Department of General and Inorganic Chemistry and Research Centre, Faculty of Chemical Technology, University of Pardubice, 532 10 Pardubice, Czech Republic;4. Centre for Material Science, University of Pardubice, 532 10 Pardubice, Czech Republic;5. Department of Physical Electronics, Faculty of Science, Masaryk University, Kotlá?ská 2, 611 37 Brno, Czech Republic |
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Abstract: | Thin films of AgSbS2 are important for phase‐change memory applications. This solid is deposited by various techniques, such as metal organic chemical vapour deposition or laser ablation deposition, and the structure of AgSbS2(s), as either amorphous or crystalline, is already well characterized. The pulsed laser ablation deposition (PLD) of solid AgSbS2 is also used as a manufacturing process. However, the processes in plasma have not been well studied. We have studied the laser ablation of synthesized AgSbS2(s) using a nitrogen laser of 337 nm and the clusters formed in the laser plume were identified. The ablation leads to the formation of various single charged ternary AgpSbqSr clusters. Negatively charged AgSbS, AgSb2S, AgSb2S, AgSb2S and positively charged ternary AgSbS+, AgSb2S+, AgSb2S, AgSb2S clusters were identified. The formation of several singly charged Ag+, Ag, Ag, Sb, Sb, S ions and binary AgpSr clusters such as AgSb, Ag3S?, SbS (r = 1–5), Sb2S?, Sb2S, Sb3S (r = 1–4) and AgS, SbS+, SbS, Sb2S+, Sb2S, Sb3S (r = 1–4), AgSb was also observed. The stoichiometry of the clusters was determined via isotopic envelope analysis and computer modeling. The relation of the composition of the clusters to the crystal structure of AgSbS2 is discussed. Copyright © 2009 John Wiley & Sons, Ltd. |
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