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Publikācija: Correlation between Optical

Publication Type Conference paper
Funding for basic activity Other research projects
Defending: ,
Publication language English (en)
Title in original language Correlation between Optical, Morphological and Compositional Properties of GeSn Layer Irradiated by Infrared Nd:YAG Laser Radiation
Field of research 1. Natural sciences
Sub-field of research 1.3 Physical sciences
Authors Pāvels Onufrijevs
Artūrs Medvids
P. Scajev
M. Andrulevicius
Algirdas Selskis
Līga Grase
Keywords GeSn, Nd:YAG laser, thermogradient effect.
Abstract Si-based materials have been the driving force behind the rapid development of revolutionary electronic technology and have dominated the market for the past 40 years. As a parallel effort to advance the reach of group IV technology to mid-infrared range, researchers have strived for years to create group IV-based optical devices that can exploit the benefits of silicon while also being fully compatible with Si electronics. The all group of IV alloy of germanium-tin (GeSn) based material has shown promising characteristics extending the detection range to long wavelength range, however due to limited Sn atoms solubility, only 4% Sn in alloys with Ge are currently available. Therefore, we applied pulsed laser radiation to Ge0.96Sn0.04 layers epitaxially grown on Si substrates by MBE (molecular beam epitaxy) to redistribute Sn atomic content according to thermogradient effect [1] with the aim to increase Sn content at the surface. We used nanosecond laser irradiation (1064 nm wavelength, 6 ns pulse duration) with different intensities to modify GeSn layer. The X-ray photoelectron spectroscopy, Raman and UV reflection spectra confirmed Sn atomic content increase at the surface by order of magnitude. SEM and AFM imaging provided evident microstructure changes, while carrier lifetime changes determined by differential transmittivity were not observed, indicating that laser irradiation does not reduce material electronic quality.
Reference Onufrijevs, P., Medvids, A., Scajev, P., Andrulevicius, M., Selskis, A., Grase, L. Correlation between Optical, Morphological and Compositional Properties of GeSn Layer Irradiated by Infrared Nd:YAG Laser Radiation. In: BaltSilica 2018: Book of Abstracts of the 8th International Conference on Silicate Materials, Latvia, Rīga, 29-30 May, 2018. Riga: RTU Publishing House, 2018, pp.80-81. ISSN 2243-6057.
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