Self-powered and high-performance all-fiber integrated photodetector based on graphene/palladium diselenide heterostructures

An all-fiber integrated photodetector is proposed and demonstrated by assembling a graphene/palladium diselenide (PdSe2) Van der Waals heterostructure onto the endface of a standard optical fiber. A gold film is covered on the heterostructure working as an electrode and a mirror, which reflects back the unabsorbed residual light for further reusage. Owing to the low bandgap of PdSe2, the all-fiber photodetector shows a broadband photoresponse from 650 to 1550 nm with a high photoresponsivity of 6.68x10(4) AW(-1), enabling a low light detection of 42.5 pW. And the fastest temporal response is about 660 mu s. Taking advantage of heterostructures, the photodetector can work in self-powered mode with the on/off ratio about 82. These findings provide new strategies for integrating two-dimensional materials into optical fibers to realize integrated all-fiber devices with multi-function applications. (C) 2021 Optical Society of America under the terms of the OSA Open Access Publishing Agreement

Automated summary

An all-fiber integrated photodetector utilizing a graphene/PdSe2 heterostructure and a gold film electrode/mirror demonstrates broadband photoresponse with high responsivity, low light detection, and fast temporal response. The device can operate in self-powered mode with a high on/off ratio, showcasing potential for multi-function applications in integrated all-fiber devices.