The typical superstrate structure of a CdTe/CdS solar cell is composed of four layers as follows:Ī transparent and conducting oxide (TCO) which acts as a front contactĪ CdS film which is also called window layer Schematics of a typical superstrate CdS/CdTe solar cell structure The schematics of CdS/CdTe Solar cell is shown in Fig 1.įig 1. Efficiencies as high as 16.5% have been achieved, but still there is some potential for increasing them. The absorber layer thickness for thin film CdTe solar cells is normally between 2 and 10 m. Thin film CdTe solar cells are typically hetero-junctions with CdS being the n-type partner, or window layer. On the other hand, CdS has a bandgap energy of 2.42 eV, and transmits most of the visible spectrum. The two key properties of this material are its band gap (1.5 eV), close to the ideal for photovoltaic conversion efficiency (1.45 eV), and its high optical absorption coefficient. Polycrystalline thin film CdTe continues to be a leading material for the development of cost effective and reliable photovoltaics. To obtain the highest efficiency, the thickness of CdTe and CdS has been modified separately to check the improvement of cell efficiency in PC1D simulator and efficiency beyond 20% has been achieved. A study has been made to improve the efficiency of CdTe/CdS solar cell. of Electronics and Communication Engineering NSHM Knowledge CampusĪbstract Cadmium telluride is a promising photovoltaic material for thin-film solar cells. High Efficiency CdTe/CdS Thin Film Solar Cellĭept.
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