On the mechanism of encapsulated particle formation during pulsed laser deposition of WSex thin-film coatings
14 сентября 2018
208
Предметная область | — |
Выходные данные | — |
Ключевые слова | — |
Вид публикации | Статья |
Контактные данные автора публикации | Fominski, V.Y.ab , Grigoriev, S.N.ab, Gnedovets, A.G.ab, Romanov, R.I.ab a National Research Nuclear University MEPhI, Moscow, 115409, Russian Federation b Moscow State University of Technology STANKIN |
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Аннотация
We have studied factors influencing the formation of particles with the structure of a spherical metal W core inside a WSe2 shell during pulsed laser deposition (PLD) of thin films of tungsten diselenide under variable conditions (buffer gas (Ar) pressure, substrate temperature). It is established that the metal core is formed at the stage of laser ablation of a synthesized WSe2 target, while the shell grows as a result of condensation, migration, and redistribution of atoms during deposition of a laser-initiated atomic flow on the surface of a growing film. Retardation of the atomic flow by a buffer gas at pressures within 2-10 Pa does not ensure activation of the shell condensation process on the metal core in the gas phase. Increasing the substrate temperature from room temperature up to 250°C leads to transformation of the shell structure from amorphous into laminar.
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