Journal Article

FZJ-2020-02872

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Ultra-low-threshold continuous-wave and pulsed lasing in tensile-strained GeSn alloys

Elbaz, A. ; Buca, D. (Corresponding author)FZJ* ; von den Driesch, N.FZJ* ; Pantzas, K. ; Patriarche, G. ; Zerounian, N. ; Herth, E. ; Checoury, X. ; Sauvage, S. ; Sagnes, I. ; Foti, A. ; Ossikovski, R. ; Hartmann, J.-M. ; Boeuf, F. ; Ikonic, Z. ; Boucaud, P. ; Grützmacher, D.FZJ* ; El Kurdi, M. (Corresponding author)

2020
Nature Publ. Group London [u.a.]

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Please use a persistent id in citations: http://hdl.handle.net/2128/25606  doi:10.1038/s41566-020-0601-5

Abstract: Strained GeSn alloys are promising for realizing light emitters based entirely on group IV elements. Here, we report GeSn microdisk lasers encapsulated with a SiNx stressor layer to produce tensile strain. A 300 nm-thick GeSn layer with 5.4 at% Sn, which is an indirect-bandgap semiconductor as-grown, is transformed via tensile strain engineering into a direct-bandgap semiconductor that supports lasing. In this approach, the low Sn concentration enables improved defect engineering and the tensile strain delivers a low density of states at the valence band edge, which is the light hole band. We observe ultra-low-threshold continuous-wave and pulsed lasing at temperatures up to 70 K and 100 K, respectively. Lasers operating at a wavelength of 2.5 μm have thresholds of 0.8 kW cm−2 for nanosecond pulsed optical excitation and 1.1 kW cm−2 under continuous-wave optical excitation. The results offer a path towards monolithically integrated group IV laser sources on a Si photonics platform.

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Contributing Institute(s):

1. Halbleiter-Nanoelektronik (PGI-9)
2. JARA Institut Green IT (PGI-10)
3. 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 - Engineering, Computing and Technology ; Current Contents - Physical, Chemical and Earth Sciences ; Ebsco Academic Search ; Essential Science Indicators ; IF >= 30 ; JCR ; Nationallizenz ; SCOPUS ; Science Citation Index ; Science Citation Index Expanded ; Web of Science Core Collection

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