Abstract:
To study the electronic state of iron atoms doped in germanium, a double film system Fe–Ge was formed under ultrahigh vacuum conditions, obtained by annealing a Fe layer deposited on a Ge film formed on the surface of a Mo(110) crystal. The results obtained using a combination of low-energy ion scattering spectroscopy (LEIS), Auger electron spectroscopy (AES), low-energy electron diffraction (LEED), and Anderson work function measurements indicate that the Fe-Ge double film formed in this way is characterized by a uniform distribution of Fe and Ge atoms over the film bulk. It is shown that a change in the relative content of Fe atoms leads to a significant change in their electronic state. The first measurements of the absolute charge of Fe atoms acquired by them when doped in germanium indicate that as the Fe content increases, the charge value systematically decreases from 0.34e for a single atom to 0.07e for the same Fe and Ge ratio. This is accompanied by a change in the length of the Fe$^+$ – Ge$^-$ interatomic bond within the range from 0.141 nm to 0.118 nm. The latter, being evidence of structural transformations of Ge, characterized by a change in the lengths and angles of the lattice bonds, can be used to identify structural units of doped germanium at different concentrations of the doping component.
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