Homepage of Prof. Dr. K. Schroeder

 

Understanding of Growth of the Nanoscale

  • Surface Structure: As-covered Si(111)

    • Si viewed along the cube diagonal: hexagonal lattice

    • Structure of As-covered Si(111) surface

    • Deposition of Si-adatoms

    • Diffusion of Si-adatoms

    • Exchange of Si-adatoms <--> As

    • Diffusion of Si/As-adatoms

    • Reexchange of As-adatoms <--> Si

    • Island growth by agglomeration of adatoms

    • Step flow (double layer)

    During epitaxy on surfactant-covered surfaces ad-atom diffusion and exchange reactions compete.

  • Results of Quantum Mechanical Calculations

    Diffusion jump of Si-adatom

    Exchange of Si <--> As

    • Structure

    • Energy changes along path (mpeg1 or mpeg2)

    • Electron density shows bond changes