▎ 摘　　要

Photodetectors with ultrahigh responsivity are meaningful for weak optical signal detection in the fields of biomedicine science and environmental monitoring. Graphene/Si hybrid photodetectors with ultrahigh photoresponsivity have already been reported. However, with all atoms exposed to the environment, graphene-based devices often show low stability. Here, the PMMA layer assisting the graphene transfer process has been retained on the surface of graphene during the fabrication process of the graphene/Si hybrid photodetector, and a high stability graphene photodetector with ultrahigh responsivity (>10(6) A W-1 for white LED illumination) has been successfully demonstrated. The fabricated graphene/Si hybrid photodetectors may have the potential to be utilized in functional near-infrared spectroscopy systems or underwater wireless optical communication systems for weak optical signal detection. (C) 2021 Published by Elsevier B.V.