title: Bi2S3microspheres grown on graphene sheets as low-cost counter-electrode materials for dye-sensitized solar cells.
abstract: In this work, we synthesized 3D Bi2S3 microspheres comprised of nanorods grown along the (211) facet on graphene sheets by a solvothermal route, and investigated its catalytic activities through I-V curves and conversion efficiency tests as the CE in DSSCs. Although the (211) facet has a large band gap for a Bi2S3 semiconductor, owing to the introduction of graphene into the system, its short-circuit current density, open-circuit voltage, fill factor, and efficiency were Jsc = 12.2 mA cm(-2), Voc = 0.75 V, FF = 0.60, and η = 5.5%, respectively. By integrating it with graphene sheets, our material achieved the conversion efficiency of 5.5%, which is almost triple the best conversion efficiency value of the DSSCs with (211)-faceted 3D Bi2S3 without graphene (1.9%) reported in the latest literature. Since this conversion-efficient 3D material grown on the graphene sheets significantly improves its catalytic properties, it paves the way for designing and applying low-cost Pt-free CE materials in DSSC from inorganic nanostructures.
authors: School of Physics and Materials Science, Anhui University, Hefei, 230601, China. liguang1971@ahu.edu.cn.
authors: Guang
authors: G
authors: Li
authors: Xiaoshuang
authors: X
authors: Chen
authors: Guandao
authors: G
authors: Gao
mesh_terms: D001729:Bismuth / Q000737:chemistry*; D004396:Coloring Agents / Q000737:chemistry*; D004566:Electrodes; D006108:Graphite / Q000737:chemistry*; D008863:Microspheres; D010087:Oxides / Q000737:chemistry; D012666:Semiconductors; D012993:Solar Energy; D013440:Sulfides / Q000737:chemistry*
chemical_list: D004396:Coloring Agents; D010087:Oxides; D013440:Sulfides; D006108:Graphite; D001729:Bismuth; C049897:bismuth sulfide