Electron Capture into the Two-ElectronO−State in GaP

New Evidence for the Two-ElectronO−State in GaP

“…The orientation dependence of the ODMR spectra and the observed strong hyperfine interaction with one Ga nucleus show that ;e the symmetry of the center is lower than tetrahedral. These results can be explained if we suppose that the infrared band is a triplet-to-1, singlet transition of the two-electron O" state, in agreement with Morgan,7 and that after capturing the second electron lattice relaxation oc- Optically detected magnetic resonance in oxygen-doped GaP shows that the infrared emission at 0.84 eV and its phonon replicas are due to a spin-triplet to -singlet transition of the two-electron state of oxygen,, The resonance data also show that the twoelectron center has axial symmetry along the 1110] axis, indicating that after capturing the second electron a strong lattice relaxation takes place.…”

“…The singlet state is expected to contain one electron in a localized state and one in an extended state. 7 This loosely bound electron can be annihilated by a nearby hole, leading to an increase in the neutral-O-donor population. Thus the same resonance is expected to be observed on the neutral-O 0 -related emission bands.…”

Semiconductors at IBM: Physics, Novel Devices, and Materials Science

“…In collaboration with B. Welber and R. Bhargava, he showed that red luminescence is due to cadmiumoxygen or zinc-oxygen complexes rather than pairs, as had been previously supposed [226]. With H. Maier, Morgan demonstrated the importance of strain in determining ionization energies of defects [227] and applied the analyses to the oxygen center [228]. P. Yu and various collaborators have used resonant Raman and Brillouin scattering to obtain extensive information about excitons and point defects mostly in II-VI compounds.…”