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Absorbance spectra of stretching modes of (a) a-Si :H and (c) pm-Si :H PIN layer stacks on intrinsic FZ wafer and their zoom-in to the peak (b, d). The spectra are extracted from infrared transmission at four light-soaking (LS) states : as-deposited (black), after one hour of LS (red), after 5 h (blue) and after 20 h (green).
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