The H passivation of Se double-donors was investigated by using magnetic resonance techniques. The H was introduced by heat treatment, at high temperatures, in an atmosphere of water vapor. Two spectra were observed, and were labelled Si-NL60 and Si-NL61. Both of them had trigonal symmetry for the paramagnetic center. By using isotopically enriched Se, and deuterated water, the participation of Se and H in the structure of the centres was conclusively established. By analyzing the experimental data, it was concluded that the SiNL60 spectrum corresponded to a Se-H pair in a neutral charge state. No unambiguous interpretation of the Si-NL61 spectrum was established. According to the present spectroscopic information, Si-NL61 was the spectrum of a Se center with two H atoms on non-equivalent sites, which was observed in an ionized state. Alternatively, it could have corresponded to 2 neutral, Se plus H, pairs which resembled each other so much that they could not be distinguished by using electron paramagnetic resonance methods.

Hydrogen Passivation of the Selenium Double Donor in Silicon - a Study by Magnetic Resonance P.T.Huy, C.A.J.Ammerlaan, T.Gregorkiewicz, D.T.Don: Physical Review B, 2000, 61[11], 7448-58