8.5% Efficient Screen-Printed CdS/CdTe Solar Cell Produced on a 5×10 cm2 Glass Substrate

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Abstract
The preparation conditions of CdS sintered film for 5×10 cm2 screen-printed CdS/CdTe solar cells were investigated. Increasing the belt speed of the belt furnace increased the residual amount of Cl ions in the CdS sintered film and lowered the efficiency of the cell. The optimum belt speed was 2 cm/min, corresponding to a sintering time of 90 min. The thickness of the CdS film was changed by changing the screen thickness. Increasing the thickness of the CdS film lowered its surface resistivity and improved the fill factor of a cell. A solar cell of 8.5% intrinsic efficiency was obtained from CdS film printed by an 80 mesh screen and sintered at 690°C at a belt speed of 2 cm/min.

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