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A parameter set was found which allows depositing ZnSe thin films with good properties to be used as buffer layer in solar cells with ZnO/ZnSe/CIGS structure. In this way, the ZnSe compound could be used in substitution of the CdS which is a toxic material generally used as buffer layer in Cu(In,Ga)Se2 (CIGS) based solar cells. The influence of the deposition parameters on the structural, optical and morphological properties of ZnSe films deposited on glass substrates by evaporation, was determined through XRD, spectral transmittance and AFM measurements.

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The purpose of this work is to find the conditions for fabricating SnO 2: F/CdS and ZnO/CdS bilayer structures with adequate properties to be used as optical windows in solar cells based on CdTe and CuInSe 2 thin films. In both types of structures the CdS layer is deposited by chemical bath deposition (CBD) and by the evaporation method; the SnO 2: F and ZnO layers are deposited by spray pyrolysis and reactive evaporation, respectively. The influence of the preparation methods on the optical and structural properties of each of the layers constituting the bilayer structures, was studied through spectral transmittance and X-ray diffraction (XRD) measurements. The studies revealed that the spectral transmittance of the ZnO/CdS system is significantly greater than that of the SnO 2: F/CdS structure, indicating that the first type of structure is more suitable for using as optical window in solar cell fabrication.