Bidirectionally-trigged 2D MoS2 synapse through coplanar-gate electric-double-layer polymer coupling for neuromorphic complementary spatiotemporal learning

Synapse is not merely the connection of two adjacent neurons in the human brain but also the fundamental structure for information transmission in an ever-changing pattern. Therefore, the hardware implementation of artificial synapses/ neurons with intriguing spatiotemporal-processed functions is of great significance for brainlike intelligent electronics. Herein, bidirectionally-trigged coplanar-gate electric-double-layer two-dimensional (2D) MoS2 neuromorphic transistors with complementary spatiotemporal learning abilities are successfully demonstrated through the laterally-coupled and proton-conducting poly (vinyl alcohol) electrolytes. The fundamental bidirectional neuromorphic behaviors such as excitatory and inhibitory postsynaptic current (EPSC, IPSC), excitatory and inhibitory paired-pulse facilitation (E-PPF, I-PPF), and bidirectional frequency-dependent dynamic filtering from high-pass to low-pass transitions were successfully mimicked. Most importantly, for the first time, with the multi-coplanar-gates as inputs, the complementary spatiotemporal learning and anti-spatiotemporal learning, and bidirectional tunable spiking logic dynamics were experimentally demonstrated. Our results could provide a promising opportunity for adding the intelligent complementary spatiotemporal-learning functions in brain-like 2D nanoscale bioelectronics.