Hierarchical micro/nano-structured cobalt sulfide spindles as low-cost counter electrodes for dye-sensitized solar cells

Hierarchical micro/nano-structured cobalt sulfide spindles are synthesized via a hydrothermal method and investigated as counter electrodes for dye-sensitized solar cells (DSCs). It is demonstrated that DSCs with hierarchical cobalt sulfide spindle electrodes show an excellent photovoltaic performance competing with that of a device with a Pt counter electrode.