What question did this study set out to answer?

The central aim is to explore growth aspects and performance improvements of Group-IV alloys, specifically CGeSn.

February 5, 2026Open Access

CSiGeSn Epitaxy: Future Isovalent Isomorphism in Group-IV Materials

Puntos clave

The central aim is to explore growth aspects and performance improvements of Group-IV alloys, specifically CGeSn.
Comparison of ternary and quaternary Group-IV alloys with GeSn epitaxy.
Introduction of CBr4 as a carbon precursor.
Examination of carbon's chemical influence on Sn alloying.
Study of defect engineering induced by Si during (Si)GeSn epitaxy.
C substitution is predicted to enhance the directness of the band gap.
Introduced carbon precursor shows significant effects on Sn alloying.
Si-induced defect engineering compensates for strain relaxation during epitaxy.

Resumen

Group-IV materials constitute the foundational platform for advancing silicon-based photonics, spintronic, and energy technologies.1 Recent breakthrough in the field includes the demonstration of continues-wave electrically pumped lasing based on advanced (Si)GeSn/GeSn MQWs.2 Theoretical calculations predicts that the C substitution into Ge lattice even enhance the directness of band gap leading to laser performance improvement.3 In this study, we address the growth aspects of ternary and quaternary Group-IV alloys, in comparison with GeSn epitaxy, which serve as benchmark. Additionally, an unconventional carbon precursor - CBr4 is introduced and its chemical influence on onset Sn alloying for CGeSn alloys is presented. Later, the Si induce defect engineering to compensate the effect of C alloying on strain relaxation in diamond cubic lattice during (Si)GeSn epitaxy is studied.

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