▎ 摘　　要

Negative photoconductivity (NPC) exhibits great potential in the field of photodetection due to low power consumption and high response. Herein, the photodetectors based on InSe and multilayer graphene (MLG)/InSe van der Waals heterostructure are fabricated. The InSe photodetector shows positive photoconductivity (PPC) behavior, while the MLG/InSe photodetector exhibits NPC behavior. The ultra-high responsivity (1.88 x 10(5) A/W) is achieved for the NPC MLG/InSe photodetector, which is five orders of magnitude higher than that of the sole InSe photodetector based on PPC (6.97 A/W). The MLG/InSe photodetector also shows a high external quantum efficiency (6.41 x 10(7)%) and a fast response time (22 ms). The proposed high-performance MLG/InSe heterostructure photodetector based on NPC for low -dimensional materials may extend applications in future optoelectronic devices.(c) 2022 Vietnam National University, Hanoi. Published by Elsevier B.V.