Thermal evolution of Fe on Ge(1 1 1)-c(2 × 8) surface and the effect of (√3 × √3)R30° Ag-Ge buffer layer

Hung Chang Hsu, Ming Kuan Jhou, Wen Chin Lin, Tsu Yi Fu*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


Using scanning tunneling microscopy, two systems of Fe deposition on clean Ge(1 1 1)-c(2 × 8) surface and surfaces with a (√3× √3)R30° Ag-Ge buffer layer were compared. Complex surface alloy structures were easily formed on Fe/Ge systems through annealing at 300-650 K. On clean Ge(1 1 1) surfaces, similar surface morphology evolution was observed when two different amounts of Fe were deposited. To reduce the complexity, (√3× √3)R30° Ag-Ge interfaces were used as buffer layers. The growth morphologies differed in the presence and absence of the buffer layers. During annealing at 570 K, (2 × 2) reconstruction platform islands were formed in the Fe-Ge system, which transformed to three-dimensional (3D) islands at 640 K. With Ag buffer layer, only nanoparticle growth occurred and 3D islands were formed early at 570 K. Generally, √19 ring clusters increased to break the order c(2 × 8) reconstruction by increasing the temperature and disappeared at 640 K in a Fe-Ge system, but only √7 ring clusters appeared at 390 K with (√3×√3)R30° Ag-Ge buffer layer.

Original languageEnglish
Pages (from-to)778-783
Number of pages6
JournalApplied Surface Science
Publication statusPublished - 2015 Nov 15


  • Fe
  • Ge(1 1 1)
  • STM

ASJC Scopus subject areas

  • General Chemistry
  • Condensed Matter Physics
  • General Physics and Astronomy
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films


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