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Synthesis of GeSn particles with high substitutional Sn concentration by pulsed laser deposition
Author(s): Teppei Nakashima; Toshifumi Kikuchi; Kaname Imokawa; Daisuke Nakamura; Hiroshi Ikenoue
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Paper Abstract

We have proposed that germanium-tin (GeSn) particles with high substitutional Sn concentrations can be synthesized by pulsed laser deposition (PLD) in ambient Ar at low pressure (~100 Pa). In this method, a Ge0.9Sn0.1 target is ablated by KrF excimer laser irradiation. At low Ar pressure (~100 Pa), the agglomeration of Ge and Sn atoms occurs easily in ambient Ar, and the agglomerated particles are rapidly cooled by collision with Ar atoms. An Si-receiving substrate was placed in front of the target. Various GeSn particles from several 100 nm to approximately 20 μm with spherical, disk, and irregular shapes were deposited on the Si-receiving substrate. In Raman spectra, the Ge-Ge vibration peaks of all the particles were shifted to lower wavenumbers compared with those of the Ge(100) crystal. The Raman peak position reportedly shifts to lower wavenumbers with increased substitutional Sn concentration in crystalline Ge. Thus, GeSn crystal particles with over 10% substituted Sn atoms can be synthesized by low-pressure PLD.

Paper Details

Date Published: 4 March 2019
PDF: 6 pages
Proc. SPIE 10907, Synthesis and Photonics of Nanoscale Materials XVI, 109070P (4 March 2019); doi: 10.1117/12.2509179
Show Author Affiliations
Teppei Nakashima, Kyushu Univ. (Japan)
Toshifumi Kikuchi, Kyushu Univ. (Japan)
Kaname Imokawa, Kyushu Univ. (Japan)
Daisuke Nakamura, Kyushu Univ. (Japan)
Hiroshi Ikenoue, Kyushu Univ. (Japan)

Published in SPIE Proceedings Vol. 10907:
Synthesis and Photonics of Nanoscale Materials XVI
Andrei V. Kabashin; Jan J. Dubowski; David B. Geohegan, Editor(s)

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