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Electron paramagnetic resonance (EPR) and photo-EPR studies of aggregate centers with two iron atoms in silicon

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Abstract

We have investigated iron by EPR (electron paramagnetic resonance) and photo-EPR in initially boron doped silicon samples in which the iron concentration exceeded the boron content. A new EPR spectrum, showing orthorhombic-I symmetry was observed and could be fitted by an effective spin Hamiltonian with the parameters S=3/2, g=2.07, and E/D=0.68. We identify this spectrum as a new modification of a Fe2B center which has the same symmetry but different configuration of the constituent atoms.

Furthermore, we were able to determine the donor level of the old Fe2B center to E=EV+0.57±0.02 eV above the valence band.

We have also investigated the Fe2 donor. According to our straightforward interpretation the energy levels of the transitions from Fe2+ to Fe20 and from Fe20 to Fe2+ were determined as E=EV+0.61±0.02 eV and E=EC-0.67±0.02 eV, respectively, suggesting a lattice relaxation on electron capture, which is unusual for transition metal centers in silicon.

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Authors and Affiliations

  1. Institute of Physics and Physical Technologies, Technical University of Clausthal, 38678, Clausthal-Zellerfeld, Germany

    S. Strube, H. Vollmer & R. Labusch

  2. Dept. of Physics, University of Natal at Durban, Durban, 4041, South Africa

    R. Labusch

Authors
  1. S. Strube
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  2. H. Vollmer
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  3. R. Labusch
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Correspondence to H. Vollmer.

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PACS

71.55.Cn; 76.30.Fc

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Strube, S., Vollmer, H. & Labusch, R. Electron paramagnetic resonance (EPR) and photo-EPR studies of aggregate centers with two iron atoms in silicon. Appl. Phys. A 81, 87–91 (2005). https://doi.org/10.1007/s00339-004-3031-1

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  • DOI: https://doi.org/10.1007/s00339-004-3031-1

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