Zeeman photoluminescence spectroscopy of isoelectronic beryllium pairs in silicon

Isoelectronic beryllium (Be) pair centers in silicon have been studied by photoluminescence spectroscopy under a magnetic field. The photoluminescence of the bound-exciton recombination at this center shows that the number of Zeeman split peaks is the smallest for the magnetic field applied along a 〈 100 〉 direction. This result provides direct evidence that the Be pairs orient themselves in 〈 111 〉 directions. The g values of the hole and electron in this bound exciton determined by fitting of the Zeeman diagrams support the shallow acceptor character of this isoelectronic center.