Abstract
We investigate the impact of pulsed excimer laser anneal on fully strained germanium-tin alloys (Ge1−xSnx) epitaxially grown on Ge substrate by molecular beam epitaxy. Using atomic force microscopy, X-ray diffraction, transmission electron microscopy, and X-ray photoelectron spectroscopy, the morphological and compositional evolution of Ge1−xSnx with Sn content up to 17% after annealing using various conditions is studied. Ge0.83Sn0.17 samples annealed at 80 mJ/cm2 or 150 mJ/cm2 have no observable changes with respect to the as-grown sample. However, Ge0.83Sn0.17 samples annealed at 250 mJ/cm2 or 300 mJ/cm2 have Sn-rich islands on the surface, which is due to Sn segregation in the compressively strained epitaxial film. For Ge0.89Sn0.11, significant Sn redistribution occurs only when annealed at 300 mJ/cm2, indicating that it has better thermal stability than Ge0.83Sn0.17. A mechanism is proposed to explain the formation of Sn-rich islands and Sn-depleted regions.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
