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We use thin film nanocrystalline (NC) iron pyrite as an interface layer at the back contact of CdS/CdTe solar cells. In both spattered and CSS deposited CdTe devices, improvements in Voc and FF were obtained after the inclusion of the NC FeS2 layer. Repeated tests show that Voc increases by >30 mV and FF increases by ∼3.5% for a standard CdTe device having efficiency of ∼13%. The devices tested...
We describe the application of iron persulfide (pyrite, FeS2) NC thin films as a Cu-free back contact to CdS/CdTe solar cells. We synthesized cubic FeS2 NCs, and prepared NC-FeS2 films by drop-casting to investigate their use in thin film solar cells. Characterization of the FeS2 NC films revealed sub-band-gap optical absorption, holes as the majority carrier, free hole concentration of ∼1019 cm−3...
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