Super-additive interaction of homo- and heterosynaptic plasticity in a hot electron transfer optosynapse for visual sensing memory and logic operations
JOURNAL OF MATERIALS CHEMISTRY C(2023)
摘要
In the realm of cognitive neuroscience, the coupling of homosynaptic activation and heterosynaptic modulation plays a crucial role in enhancing consolidation and sharpening long-term memories. Building upon this understanding, the integration of optosynapses within neuromorphic visual systems offers a promising avenue to replicate the fundamental mechanisms of the human visual system, leading to not only reduced communication latency and power consumption but also a heightened level of cognitive performance. In this work, a hot electron transfer optosynapse is realized based on zinc-tin oxide (ZTO) with embedded Au nanoparticle (NP) heterostructure phototransistors. Gate voltage spikes of -5 V (V-G = -5 V) and 520 nm light are applied as the homosynaptic and modulatory heterosynaptic stimuli, respectively. Due to the light-bias coupling enhanced electron tunneling and hot electrons generated by the intraband transition in Au NPs, super-additivity of homosynaptic and heterosynaptic plasticity can be achieved in the ZTO/Au NPs optosynapse. The learning and memory performance of this bioinspired optosynapse is reinforced due to the super-additive interaction. Furthermore, the hot electron transfer optosynapse is capable of performing logic operations, making it a candidate for integration into neuromorphic computing architectures and the advancement of machine vision.
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关键词
hot electron transfer optosynapse,heterosynaptic plasticity,visual sensing memory,electron transfer,super-additive
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