Metal–Organic Frameworks Coordination-Oriented Polymer Dielectrics for Neuromorphic Vision Sensors

Abstract

Interface engineering based on polymer dielectrics shows great promise in organic field-effect transistors (OFETs)-based neuromorphic vision sensors (NeuVS). However, the highly disordered chain arrangement of polymer dielectrics often has a negative impact on the dynamic behavior of charge carriers, thereby affecting the sensing, memory, and computing performance of devices. To this end, we report an effective strategy to improve the orientation of polymer dielectrics by using a coordination combination of metal–organic frameworks (MOFs) and polymer. As a result, the coordination of MOFs with polymers improves the polarization of hydroxyl (–OH) and the resulting interfacial dipole could achieve an increase of photogenerated carriers in NeuVS with both higher mobility (above 20 cm²/(V • s)) and better optical figures of merit than devices without the coordination of MOFs. Furthermore, the new MOFs-polymer dielectric gives NeuVS devices temporal dynamics that enable better color extraction in static images. More importantly, in-sensor perception of moving objects was simulated, allowing postprocessing to produce over 95% action recognition accuracy. This attempt provides a new idea for the development of dielectric materials for highly sensitive light detection and visuomorphic computing.

Keywords

artificial synapse / interface engineering / metal–organic frameworks / organic phototransistors

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