Adsorption of atomic hydrogen on the Si(001) 4×3-In surface studied by coaxial impact collision ion scattering spectroscopy and scanning tunneling microscopy

Using coaxial impact collision ion scattering spectroscopy, scanning tunneling microscopy (STM), and low-energy electron diffraction techniques, we have investigated the interaction of atomic hydrogen with the Si(001) 4×3-In surface phase. During this interaction, Si–In bonds are broken and replaced by Si–H bonds. As a result, the 4×3 reconstruction is destroyed and In atoms form small clusters on the hydrogen-terminated Si(001) surface. The indium clusters are found to be not monocrystalline but, rather, polycrystalline. This is in contrast with other metal adsorbate/Si systems such as H/Ag/Si(111), H/Pb/Si(111), and H/In/Si(111) where metal atoms are known to form epitaxial monocrystalline islands. The size of the In clusters increases with increasing substrate temperature during hydrogen exposure of the 4×3-In phase. Using STM, we have confirmed that, as a result of atomic hydrogen interaction, the Si substrate becomes bare and forms the Si(001) 4×1-H phase, indicating that the underlying Si layer in t...

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