Abstract
A new line spectrum at about 860 meV has been observed in silicon co-doped with iron and boron. The isochronal annealing behaviour of this line spectrum and the FeB centre was studied by transmission spectroscopy and electron paramagnetic resonance (EPR), respectively. The good agreement between the two measurements strongly suggests that the line spectrum originates from excitations at the trigonal FeB pair complex, well known from previous EPR studies. The positions of the FeB donor and acceptor levels were estimated to be at Ev+110 meV and Ec-275 meV respectively, in close agreement with previously reported values for the FeB pair. Furthermore, the energy difference between the ground and first excited states of this centre was determined to be 1.09 meV, which compares favourably with the 0.75 meV EPR value previously obtained.
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