Journal Article

FZJ-2016-04719

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Study of GeSn based heterostructures: towards optimized group IV MQW LEDs

Stange, D. (Corresponding author)FZJ* ; von den Driesch, N.FZJ* ; Rainko, D.FZJ* ; Schulte-Braucks, C.FZJ* ; Wirths, S.FZJ* ; Mussler, G.FZJ* ; Tiedemann, A.FZJ* ; Stoica, T.FZJ* ; Hartmann, J. M. ; Ikonic, Z. ; Mantl, S.FZJ* ; Grützmacher, D.FZJ* ; Buca, D.FZJ*

2016
Soc. Washington, DC

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Please use a persistent id in citations: http://hdl.handle.net/2128/12421  doi:10.1364/OE.24.001358

Abstract: We present results on CVD growth and electro-optical characterization of Ge0.92Sn0.08/Ge p-i-n heterostructure diodes. The suitability of Ge as barriers for direct bandgap GeSn active layers in different LED geometries, such as double heterostructures and multi quantum wells is discussed based on electroluminescence data. Theoretical calculations by effective mass and 6 band k∙p method reveal low barrier heights for this specific structure. Best configurations offer only a maximum barrier height for electrons of about 40 meV at the Γ point at room temperature (e.g. 300 K), evidently insufficient for proper light emitting devices. An alternative solution using SiGeSn as barrier material is introduced, which provides appropriate band alignment for both electrons and holes resulting in efficient confinement in direct bandgap GeSn wells. Finally, epitaxial growth of such a complete SiGeSn/GeSn/SiGeSn double heterostructure including doping is shown.

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Contributing Institute(s):

1. Halbleiter-Nanoelektronik (PGI-9)
2. JARA-FIT (JARA-FIT)

Research Program(s):

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

Appears in the scientific report 2016

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Database coverage:
; ; ; Current Contents - Physical, Chemical and Earth Sciences ; DOAJ Seal ; IF < 5 ; JCR ; NCBI Molecular Biology Database ; SCOPUS ; Science Citation Index ; Science Citation Index Expanded ; Thomson Reuters Master Journal List ; Web of Science Core Collection

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