Air-Stable Hydrogen-Substituted Graphdiyne/2D Halide Perovskite Heterojunction for Self-Powered Neuromorphic Vision

Neuromorphic visual systems that mimic human vision can efficiently capture and process visual information with an in-sensor computing paradigm. However, photoelectronic devices with high light sensitivity, stability and tunable charge-carrier interactions are still required for constructing such systems. Herein, a heterojunction of two-dimensional (2D) hydrogen-substituted graphdiyne (HsGDY) and 2D (BA) 2 PbI 4 perovskite for neuromorphic photoelectric sensing and visual information processing is demonstrated. The 2D perovskite functions as a light-to-electricity conversion layer, and the 2D HsGDY forms heterojunction with the perovskite layer with well-matched energy bands to allow effective charge injection in the heterojunction at zero-voltage bias. The unique sp-sp 2 hybridization and alkyne bonds in the HsGDY thin film provide abundant charge-carrier interactive sites that enable efficient neuromorphic information processing. The device is utilized for environmentally adaptive vision and experience learning. Excitatory post-synaptic current (EPSC) gain and paired-pulse facilitation (PPF) index of the device stored in ambient air for 7 weeks retained 95% and 98% of the initial values. A device array is fabricated, applicable to perceive and process dynamic visual information. These results provide a device basis for future intelligent neuromorphic vision hardware.