Optical and electronic properties of Ge–Sb–Te films

Optical properties of Ge–Sb–Te chalcogenides

“…However, the band gaps of highest growth rate samples are larger than these of lowest growth rate samples. This trend is different from our earlier paper [7], probably because of different levels of oxygen contamination in the earlier samples. The noise near $0.8 eV in the PDS data arises from experimental artifacts due to exchanges of gratings and filters.…”

“…In both samples, the highest growth rate has the lowest band gap, and the lowest growth rate has highest band gap. In this case, the larger band gap may be due to oxygen contamination [7].…”