The electronic and atomic structures of the oxygen chains assigned to late thermal double donors (TDDs) in silicon are studied using accurate total-energy calculations. We find that the ring-type O-chain model is best suited for TDDs and better than the di-Y-lid-type O-chain model. The ring-type O chains have slightly alternating C2v–C1h symmetry consistent with the recent high-field electron paramagnetic resonance experiments. The spin densities of the double-donor states are located outside the region of the O atoms, which makes the hyperfine interaction of an unpaired donor electron with the O17 nuclear spins very weak.
The effects of oxygen flow rates on the characteristics of electron beam evaporated MgO thin films are investigated. The experimental results reveal that the crystallinity, surface roughness, stoichiometry, density, and secondary electron emission coefficient of MgO thin films change with the oxygen flow rates during film deposition. In addition, discharge voltages of PDP device strongly depend on the stoichiometry and density of MgO film.
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