Direct-bandgap emission from hexagonal Ge and SiGe alloys

Elham M. T. Fadaly, Alain Dijkstra, Jens Renè Suckert, Dorian Ziss, Marvin van Tilburg, Chenyang Mao, Yizhen Ren, Victor T. van Lange, Ksenia Korzun, Sebastian Kölling, Marcel A. Verheijen, David Busse, Claudia Rödl, Jürgen Furthmüller, Fridhelm Bechstedt, Julian Stangl, Jonathan J. Finley, Silvana Botti, Jos E.M. Haverkort, Erik P.A.M. Bakkers (Corresponding author)

Onderzoeksoutput: Bijdrage aan tijdschriftTijdschriftartikelAcademicpeer review

238 Citaten (Scopus)
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Silicon crystallized in the usual cubic (diamond) lattice structure has dominated the electronics industry for more than half a century. However, cubic silicon (Si), germanium (Ge) and SiGe alloys are all indirect-bandgap semiconductors that cannot emit light efficiently. The goal 1 of achieving efficient light emission from group-IV materials in silicon technology has been elusive for decades 2–6. Here we demonstrate efficient light emission from direct-bandgap hexagonal Ge and SiGe alloys. We measure a sub-nanosecond, temperature-insensitive radiative recombination lifetime and observe an emission yield similar to that of direct-bandgap group-III–V semiconductors. Moreover, we demonstrate that, by controlling the composition of the hexagonal SiGe alloy, the emission wavelength can be continuously tuned over a broad range, while preserving the direct bandgap. Our experimental findings are in excellent quantitative agreement with ab initio theory. Hexagonal SiGe embodies an ideal material system in which to combine electronic and optoelectronic functionalities on a single chip, opening the way towards integrated device concepts and information-processing technologies.

Originele taal-2Engels
Pagina's (van-tot)205–209
Aantal pagina's5
Nummer van het tijdschrift7802
StatusGepubliceerd - apr. 2020


Dutch Organization for Scientific Research
Province of Noord-Brabant
European Union’s Horizon Europe research and innovation programme
Horizon 2020 Framework Programme735008
H2020 Marie Skłodowska-Curie Actions751823
Research Centre Julich (FZJ)
Nederlandse Organisatie voor Wetenschappelijk Onderzoek


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