High-sensitivity optical-fiber-compatible photodetector with an integrated CsPbBr3-graphene hybrid structure

Assembling different materials into one optical fiber to realize multifunctional all-fiber devices is always a challenging task, mainly because the process is not compatible with current microfabrication technology. Although various devices have been proposed to achieve all-fiber optoelectronic functions, most of these devices cannot connect seamlessly with the mainstream optical fiber system (silica): this is a serious impairment to their further implementation in practical applications. Here, we present an integration approach that directly combines low-dimensional optoelectronic materials (CsPbBr3 nanocrystals and graphene) onto the facet of a standard silica fiber to construct a high-performance photodetector, which can detect light with a power as low as 10-11 W with photoresponsivity as high as 2 x 10(4) A/W. Moreover, it has an extraordinary light-matter interaction path beneficial to enhancing light absorption and realizing self-passivation and protection. Because of its compatibility with current established optical fiber systems, this technique could provide a highly versatile, reproducible, and low-cost method to integrate novel zero-, one-, and two-dimensional materials and deliver more sophisticated functionalities. (C) 2017 Optical Society of America