Ultrafast infrared laser crystallization of amorphous Ge films on glass substrates

Yuzhu Cheng; Alexander V. Bulgakov; Nadezhda M. Bulgakova; Jiří Beránek; Martin Zukerstein; Ilya A. Milekhin; Alexander A. Popov; Vladimir A. Volodin

doi:10.20944/preprints202309.0988.v1

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preprints.org > physical sciences > condensed matter physics > doi: 10.20944/preprints202309.0988.v1

Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Ultrafast infrared laser crystallization of amorphous Ge films on glass substrates

Yuzhu Cheng

Alexander V. Bulgakov

Nadezhda M. Bulgakova

Version 1 : Received: 13 September 2023 / Approved: 14 September 2023 / Online: 14 September 2023 (11:18:28 CEST)

A peer-reviewed article of this Preprint also exists.

Cheng, Y.; Bulgakov, A.V.; Bulgakova, N.M.; Beránek, J.; Zukerstein, M.; Milekhin, I.A.; Popov, A.A.; Volodin, V.A. Ultrafast Infrared Laser Crystallization of Amorphous Ge Films on Glass Substrates. Micromachines 2023, 14, 2048. Cheng, Y.; Bulgakov, A.V.; Bulgakova, N.M.; Beránek, J.; Zukerstein, M.; Milekhin, I.A.; Popov, A.A.; Volodin, V.A. Ultrafast Infrared Laser Crystallization of Amorphous Ge Films on Glass Substrates. Micromachines 2023, 14, 2048.

Abstract

Amorphous germanium films on non-refractory glass substrates were annealed by ultrashort near-infrared (1030 nm, 1.4 ps) and mid-infrared (1500 nm, 70 fs) laser pulses. Crystallization of germanium irradiated at a laser energy density (fluence) range from 25 to 400 mJ/cm2 under single-shot and multi-shot conditions was investigated using Raman spectroscopy. The dependence of the fraction of the crystalline phase on the fluence was obtained for picosecond and femtosecond laser annealings. The regimes of almost complete crystallization of germanium films over the entire thickness are obtained (from the analysis of Raman spectra with excitation of 785 nm laser). The possibility of scanning laser processing is shown, which can be used to create films of micro and nanocrystalline germanium on flexible substrates.

Keywords

germanium; thin films; ultrashort infrared laser annealing; crystallization; Raman spectroscopy; non-refractory substrates

Subject

Physical Sciences, Condensed Matter Physics

Copyright: This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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