Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5370132 | Applied Surface Science | 2006 | 7 Pages |
Nanocrystalline silicon (nc-Si) films were prepared by a plasma-enhanced chemical vapor deposition method at a deposition temperature below 220 °C with different dynamic pressures (Pg), hydrogen flow rates ([H2]), and RF powers, using SiH4/H2/SiF4 mixtures. We examined the photo-luminescence (PL) spectra and the structural properties. We observed two stronger and weaker PL spectra with a peak energies around EPL = 1.8 and 2.2-2.3 eV, respectively, suggesting that the first band was related to nanostructure in the films, and another band was associated with SiO-related bonds. The nc-Si films with rather large PL intensity was obtained for high [H2] and/or low pressure values, However, effects of [H2] are likely to be different from those of Pg. The average grain size (δ) and the crystalline volume fraction (Ï) at first rapidly increase, and then slowly increase, with increasing Pg. Other parameters exhibited opposite behaviors from those of δ or Ï. These results were discussed in connection with the changes in the PL properties with varying the deposition conditions.