Systematic control of nanostructured interfaces of planar Sb2S3 solar cells by simple spin-coating process and its effect on photovoltaic properties

Abstract

Herein, we report on the systematic engineering of the interface between the titanium oxide (TiO2)photoelectrode and the antimony sulfide (Sb2S3) absorber layer in planar Sb2S3 solar cells, which wasmuch unexplored, on the photovoltaic performance. Due to simple spin-coating process for thepreparation of TiO2 and Sb2S3 layers, it was possible to vary the interfacial conditions between the TiO2photoelectrode and the Sb2S3 absorber layer easily. Unlike conventional solar cells using mesoporousTiO2 electrode, it was newly found that uniform and intimate contact between TiO2 and Sb2S3 layersaffects not only efficiency but also reproducibility of planar Sb2S3 solar cells. Our results clearlyemphasize and raise the importance of interfacial engineering for the planar heterojunction solar cells.