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In this work CdS/CdTe solar cells were submitted to solution, sublimation and vapor CdCI2 treatments, followed by NP etch for several periods of time. The influence of these procedures on cell efficiency is discussed.The individual layers are analyzed and the results are compared with similar studies in the literature. The best NP etching time was 20 s for all CdCI2 treatments. The highest efficiency was achieved for the cell submitted to the solution treatment at 380°C. Although the layers have shown good properties for a high efficiency cell, the maximum overall efficiency was only 7.8%, probably due to high series and low shunt resistances.

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This work compares the properties of CdS films deposited by CBD and CSS techniques. The influence of the deposition parameters on the properties of the films was investigated. The thickness of CBD films ranged from 80 to 100nm and was affected by the concentration of reactants in the solution. For CSS films, the thickness was controlled in the 100-300nm range, being strongly influenced by the source/substrate temperatures and pressure. Grain size in CSS films was larger than in CBD films. Transmittance of CBD and CSS films ranged from 80 to 90%, but the band gap in CSS films was narrower than in CBD films, which means that CSS films transmit less of the blue part of the solar spectrum than CBD films. However, the growth of CdS films by CSS technique may be advantageous because the CdS/CdTe device could be fully manufactured in the same system.