Dye Molecule-Induced\nOptoelectronic Synaptic Behaviors\nof Monolayer MoSe<sub>2</sub>

Although MoSe<sub>2</sub>-based photodetectors have achieved\nexcellent\nperformance, the ultrafast photoresponse has limited their application\nas an optoelectronic synapse. In this paper, the enhancement of the\nrhodamine 6G molecule on the memory time of MoSe<sub>2</sub> is reported.\nIt is found that the memory time of monolayer MoSe<sub>2</sub> can\nbe obviously enhanced after assembly with rhodamine 6G exhibiting\nsynaptic characteristics in comparison to pristine MoSe<sub>2</sub>. Furthermore, the synaptic functions, including excitatory postsynaptic\ncurrent, pair-pulse facilitation, short-term memory, long-term memory,\n“learning-experience” behavior, and tunable learning\nand forgetting process, can be achieved successfully. The distinctive\nenergy-level structure of R6G and its excellent light absorption properties\ngive MoSe<sub>2</sub> access to an additional source of electrons,\nthus enabling the proposed MoSe<sub>2</sub>/rhodamine 6G hybrid heterostructure\noptoelectronic synapse to provide an efficient protocol for realizing\noptoelectronic neuromorphic computing and enormously facilitate the\nadvancement of neuromorphic electronics.