Optoelectronic synapses based on a triple cation perovskite and Al/MoO ₃ interface for neuromorphic information processing†

Abstract

Optoelectronic synaptic transistors are attractive for applications in next-generation brain-like computation systems, especially for their visible-light operation and in-sensor computing capabilities. However, from a material perspective, it is difficult to build a device that meets expectations in terms of both its functions and power consumption, prompting the call for greater innovation in materials and device construction. In this study, we innovatively combined a novel perovskite carrier supply layer with an Al/MoO ₃ interface carrier regulatory layer to fabricate optoelectronic synaptic devices, namely Al/MoO ₃/CsFAMA/ITO transistors. The device could mimic a variety of biological synaptic functions and required ultralow-power consumption during operation with an ultrafast speed of >0.1 μs under an optical stimulus of about 3 fJ, which is equivalent to biological synapses. Moreover, Pavlovian conditioning and visual perception tasks could be implemented using the spike-number-dependent plasticity (SNDP) and spike-rate-dependent plasticity (SRDP). This study suggests that the proposed CsFAMA synapse with an Al/MoO ₃ interface has the potential for ultralow-power neuromorphic information processing.

Abstract

Schematic of human visual perception, information transmission, and the corresponding CsFAMA optoelectronic synaptic transistors.