Publication date: 1st July 2014
We report on a new aqueous synthesis route of antimony sulfide (Sb2S3) at room temperature via chemical bath deposition for the use as absorber layers in Sb2S3 sensitized solar cells. The most-commonly applied method is the aqueous chemical bath deposition using antimony chloride and sodium thiosulfate as precursors at low temperatures. This technique however is circumstantial due to its mutiple-step cooling protocol. For large-scale application the necessity of cooling is costly and energy-intensive. Our method is able to decelerate the reaction at ambient conditions and we are able to fabricate sensitized mesoporous-TiO2 solar cells, which offer on average higher photovoltaic efficiency compared to the devices using the standard Sb2S3 synthesis method. Via PDS measurements we show that this is achieved by reducing the sub-bandgap trap-states. The Sb2S3 films are further characterized using UV-vis, XPS and XRD spectroscopy. Our method thereby can contribute to the development of low-cost Sb2S3 solar cells with high efficiencies.
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