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We report the successful growth of NiCo 2 S 4  nanosheet films converted from NiCo 2 O 4  nanosheet films on fluorine-doped tin oxide substrates by a low-temperature solution process. Low-cost NiCo 2 S 4  and NiCo 2 O 4  nanosheet films were directly used for replacing conventional Pt and NiO as counter electrodes and photocathodes, respectively, to construct all-nano p-type dye-sensitized solar cells (p-DSSCs) with high performance. Compared to Pt, NiCo 2 S 4  showed higher catalytic activity towards the I - /I 3  -  redox in electrolyte, resulting in an improved photocurrent density up to 2.989 mA/cm 2 , which is the highest value in reported p-DSSCs. Present p-DSSCs demonstrated a cell efficiency of 0.248 % that is also comparable with typical NiO-based p-DSSCs.

nanoscale research letters

Efficient p-type dye-sensitized solar cells with all-nano-electrodes: NiCo2S4 mesoporous nanosheet counter electrodes directly converted from NiCo2O4 photocathodes