Stability of Screen Printed CdS/CdTe Solar Cells

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Abstract
Some stability studies have been conducted on screen printed CdS/CdTe solar cells. Encapsulated CdS/CdTe modules exhibited excellent stabilities in output performance over 206 days when subjected to outdoor tests under various loading conditions. Accelerated tests were performed on unencapsulated cells. No degradation was observed after 90 days in continuous illumination test, A decrease in conversion efficiency due to an increase in series resistance of the unencapsulated cell took place under high temperature and high humidity tests. It is concluded that the increase in series resistance is caused by a decrease in adhesion between CdTe and C layers, and by swelling of the carbon layer with water absorption. Improved cells showed no degradation in efficiency over periods of 110 days at 100°C and over periods of 28 days at 65°C in 95% relative humidity.

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