Single Pulse Laser-Induced Phase Transitions of PLD-Deposited Ge2Sb2Te5 Films

Authors

  • Hongbing Lu,

    1. Leibniz Institute of Surface Modification (IOM), Permoserstr. 15, D-04318 Leipzig, Germany
    2. Ministry-of-Education Key Laboratory for the Green Preparation and Application of Functional Materials, Faculty of Materials Science and Engineering, Hubei University, Wuhan 430062, China
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  • Erik Thelander,

    1. Leibniz Institute of Surface Modification (IOM), Permoserstr. 15, D-04318 Leipzig, Germany
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  • Jürgen W. Gerlach,

    1. Leibniz Institute of Surface Modification (IOM), Permoserstr. 15, D-04318 Leipzig, Germany
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  • Ulrich Decker,

    1. Leibniz Institute of Surface Modification (IOM), Permoserstr. 15, D-04318 Leipzig, Germany
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  • Benpeng Zhu,

    1. Ministry-of-Education Key Laboratory for the Green Preparation and Application of Functional Materials, Faculty of Materials Science and Engineering, Hubei University, Wuhan 430062, China
    2. School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan 430074, China
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  • Bernd Rauschenbach

    Corresponding author
    1. Leibniz Institute of Surface Modification (IOM), Permoserstr. 15, D-04318 Leipzig, Germany
    2. University Leipzig, Institute for Experimental Physics I, Linnéstr. 5, D-04308 Leipzig, Germany
    • Leibniz Institute of Surface Modification (IOM), Permoserstr. 15, D-04318 Leipzig, Germany.
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Abstract

Phase transformations between amorphous and crystallized states are induced by irradiation with a single nanosecond laser pulse in Ge2Sb2Te5 films grown by pulsed laser deposition. By adjusting the laser fluence, the two different phases are obtained and can be distinguished by their different optical reflectivity. The effect of laser fluence on the crystalline nature of the films is studied in detail. Large structural differences between the laser-irradiated and thermally annealed films are revealed, due to the high heating rate and short duration of the laser pulse. X-ray reflectivity measurements show a density increase of 3.58% upon laser-induced crystallization.

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