Performance of Transparent Conductors on Flexible Glass and Plastic Substrates for Thin Film Photovoltaics
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14 SOLAR ENERGY↗
Engineering topics
Cimo, P.
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High Efficiency Flexible CdTe Superstrate Devices
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14 SOLAR ENERGY↗
14%-efficient flexible CdTe solar cells on ultra-thin glass substrates
Flexible glass enables high-temperature, roll-to-roll processing of superstrate devices with higher photocurrents than flexible polymer foils because of its higher optical transmission. Using flexible glass in our high-temperature CdTe process, we achieved a certified record conversion efficiency of 14.05% for a flexible CdTe solar cell. Little has been reported on the flexibility of CdTe devices, so we investigated the effects of three different static bending conditions on device performance. We observed a consistent trend of increased short-circuit current and fill factor, whereas the open-circuit voltage consistently dropped. The quantum efficiency under the same static bend condition showed no change in the response. After storage in a flexed state for 24 h, there was very little change in device efficiency relative to its unflexed state. This indicates that flexible glass is a suitable replacement for rigid glass substrates, and that CdTe solar cells can tolerate bending without a decrease in device performance.
36 MATERIALS SCIENCE↗