Fabrication of CdSSe-Decorated Graphene Aerogel with Enhanced Photoelectric Properties

The folding and conversion of the graphene fragment into honeycomb three-dimensional graphene aerogel (3DrGO) gave it a larger specific surface area and faster carrier mobility. CdS x Se 1– x at a superior S/Se ratio of 0.25:0.75 was loaded on 3DrGO and two-dimensional lamellar graphene (2DrGO) to form CdS 0.25 Se 0.75 /3DrGO and CdS 0.25 Se 0.75 /2DrGO by the solvothermal method. The effect of the 3DrGO content on the photoelectric performance of CdS 0.25 Se 0.75 /3DrGO was investigated, and the difference between the 2D lamellar structure and 3D porous structure on the photoelectric performance of the composites was compared. As the 3DrGO content rose to 25%, the photocurrent intensity of CdS 0.25 Se 0.75 /3DrGO gradually increased to the maximum of 5.1 × 10 –5 A/m 2, which was superior to that of CdS 0.25 Se 0.75 /2DrGO at the same 2DrGO content. The results showed that CdS 0.25 Se 0.75 /3DrGO exhibited a higher carrier density (3.79 × 10 20 cm –3 ) and a larger specific surface area (90.58 m 2 /g) and provided a faster transfer channel for photogenerated electrons due to the introduction of 3DrGO.