Abstract
This work reports the spectral characterisation of CuInS 2 (CIS) layers for solar cell devices by Raman scattering. The Raman spectrum from CIS is characterised by a dominant A 1 mode at approximately 290 cm −1, being the position and width of the mode sensitive to the CIS structural quality. Besides, layers with poor structural quality show the appearance in the spectra of an additional line, not allowed for chalcopyrite crystals, at approximately 305 cm −1. The relative intensity of this line has been proposed as a further marker for film quality. To deepen in the knowledge of the origin of this mode, Raman scattering measurements are performed in both polycrystalline and epitaxial layers under different conditions, including resonant Raman and different polarisation configurations. The origin of the mode is discussed in terms of (i) the presence of phases with different symmetry as Cu-Au ordering, and (ii) the possible existence of defect-related local vibrational modes.
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