Flexible CdTe solar cells on polymer films

Abstract
Lightweight and flexible CdTe/CdS solar cells on polyimide films have been developed in a ‘superstrate configuration’ where the light is absorbed in CdTe after passing through the polyimide substrate. The average optical transmission of the approximately 10‐μm‐thin spin‐coated polyimide substrate layer is more than ∼75% for wavelengths above 550 nm. RF magnetron sputtering was used to grow transparent conducting ZnO:Al layers on polyimide films. CdTe/CdS layers were grown by evaporation of compounds, and a CdCl2 annealing treatment was applied for the recrystallization and junction activation. Solar cells of 8·6% efficiency with Voc = 763 mV, Isc = 20·3 mA/cm2 and FF = 55·7% were obtained. Copyright © 2001 John Wiley & Sons, Ltd.

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