Two photoluminescence (PL) bands were observed in 4×1015 cm-2-fluence-Si+-implanted 100-nm-thick SiO2 films after rapid thermal annealing (RTA) at 950-1150 °C with 2-4 eV excitation. The PL band at 2.2 eV was excited by 3.8 eV photons in the films after RTA in dry nitrogen while the other band at 1.9 eV was excited by 2.5 eV photons in the films after isochronal RTA in wet nitrogen. Moreover, the origin for the 2.2 eV energy band was found to be the same as that of the E′δ center. The origin of the 1.9 eV band could be ascribed to the non-bridging oxygen hole centers (NBOHC). The latter was more stable even at high temperatures and showed a stronger PL intensity than the former.
|ジャーナル||Japanese Journal of Applied Physics, Part 2: Letters|
|出版ステータス||Published - 2000 2月|
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