Excitation wavelength dependence of luminescence spectra of a-Si:H

Abstract We report large shifts in the photoluminescence spectrum of a-Si:H as the excitation energy is reduced below ∼1.8 eV. The shifts in the position of maxima are equal to approximately half the change in excitation energy. Another interesting feature of the data is a sharp high energy cutoff of the spectrum, also at ∼1.8 eV, when excited above that energy.