One dimensional CulnS_2-ZnS heterostructured nanomaterials as low-cost and high-performance counter electrodes of dye-sensitized solar cells

摘要

Wurtzite CulnS_2-ZnS heterostructured nanorods are synthesized via a seed-assisted synthetic route. Cu_(1.94)S-ZnS heterostructured nanorods are transformed into CulnS2-ZnS by reacting with indium ions to convert copper sulf ide to wurtzite CulnS_2. The shapes of the CulnS_2-ZnS heterostructured nanorods can be tuned from burning torch-like to longer rod-like by varying the concentration of added indium. Dye-sensitized solar cells (DSSCs) using these heterostructured nanocrystals as counter electrodes had a power conversion efficiency (7.5%) superior to DSSCs made with conventional platinum electrode (7.1%) under the same device configuration.