Laser-induced crystallization of monoclinic nanowires in glassy selenium films
Institute of Mechanics, Udmurt Federal Research Center of the UB RAS, 426067 Izhevsk, Russia
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Published online: 11 February 2020
The authors investigate influence of 632.8 nm laser irradiation on structural properties of thin glassy (amorphous) Se films synthesized on quartz substrates using vacuum thermal evaporation. They first propose the fact that low power laser irradiation of Se films (power density PS=80 W cm−2) initiates phase transformations, accompanied by growth of monocrystalline nanowires of metastable phase of monoclinic beta-Se8 in the amorphous matrix at room temperature. New structural properties of Se films are proven to be long term stable at room temperature. It is shown that laser irradiation at PS ≥ 800 W cm−2 induces synthesis of a mixture of nanocrystallites of trigonal Se and monoclinic alpha-Se8 in the amorphous films and their mass crystallization with growth of spherulites at room temperature.
© EDP Sciences, Springer-Verlag GmbH Germany, part of Springer Nature, 2020