Laser direct writing assisted fabrication of CsPbBr3/graphene/Ag nanocomposites

Abstract

Composite materials of inorganic perovskites and graphene have proven to be an effective strategy for achieving excellent optical and electrical properties. Building upon this foundation, we introduce noble metals (Ag) to further enhance the optical and electrical performance. By integrating laser direct writing and photo-induced synthesis processes, we successfully fabricated CsPbBr3/graphene/Ag composite materials. This strategy enables the in situ anchoring of Ag nanoparticles and CsPbBr3 nanocrystals (NCs) within a porous graphene framework. Photoluminescence (PL) spectroscopy indicates that graphene can significantly quench the luminescence of pristine CsPbBr3 NCs in CsPbBr3/graphene composites, which may be induced by the rapid separation and transfer of photogenerated hole–electron pairs. Upon the addition of silver, the PL intensity slightly increases, possibly due to the surface plasmon resonance of Ag. Furthermore, the ternary architecture exhibits an enhanced photo-response, with the photocurrent density of the CsPbBr3/graphene/Ag composites reaching approximately twice that of the pristine CsPbBr3 NCs. Reliable photoelectrochemical switching functionality is demonstrated under intermittent visible-light irradiation. Within this ternary network, CsPbBr3 provides active catalytic sites, the graphene framework facilitates rapid electron transport, and the Ag nanoparticles enhance interfacial charge-transfer kinetics. Consequently, these architectures offer promising avenues for advanced photocatalytic applications.