Journal Article

FZJ-2020-01340

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Thermally activated diffusion and lattice relaxation in (Si)GeSn materials

von den Driesch, N. (Corresponding author)FZJ* ; Wirths, S.FZJ* ; Troitsch, R.FZJ* ; Mussler, G.FZJ* ; Breuer, U.FZJ* ; Moutanabbir, O. ; Grützmacher, D.FZJ* ; Buca, D.FZJ*

2020
APS College Park, MD

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Please use a persistent id in citations: http://hdl.handle.net/2128/24610  doi:10.1103/PhysRevMaterials.4.033604

Abstract: Germanium-tin (GeSn) alloys have emerged as a promising material for future optoelectronics, energy harvesting, and nanoelectronics owing to their direct band gap and compatibility with existing Si-based electronics. Yet, their metastability poses significant challenges calling for in-depth investigations of their thermal behavior. With this perspective, this work addresses the interdiffusion processes throughout thermal annealing of pseudomorphic GeSn binary and SiGeSn ternary alloys. In both systems, the initially pseudomorphic layers are relaxed upon annealing exclusively via thermally induced diffusional mass transfer of Sn. Systematic postgrowth annealing experiments reveal enhanced Sn and Si diffusion regimes that manifest at temperatures below 650 °C. The amplified low-temperature diffusion and the observation of only subtle differences between binary and ternary hint at the unique metastability of the Si-Ge-Sn material system as the most important driving force for phase separation.

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Contributing Institute(s):

1. Halbleiter-Nanoelektronik (PGI-9)
2. Analytik (ZEA-3)
3. JARA Institut Green IT (PGI-10)
4. Jülich-Aachen Research Alliance - Fundamentals of Future Information Technology (JARA-FIT)

Research Program(s):

1. 521 - Controlling Electron Charge-Based Phenomena (POF3-521) (POF3-521)

Appears in the scientific report 2020

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Database coverage:
; ; Clarivate Analytics Master Journal List ; Current Contents - Physical, Chemical and Earth Sciences ; IF < 5 ; JCR ; Science Citation Index Expanded ; Web of Science Core Collection

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