A Biodegradable, Stretchable, Healable, and Self-Powered Optoelectronic Synapse Based on Ionic Gelatins for Neuromorphic Vision System

Kaili Wang, Jicai Wu,Min Wang, Fa Zhang, Xiujuan Li, Min Xu,Duoyi Zhu, Jikun Han,Juqing Liu,Zhengdong Liu,Wei Huang

SMALL（2024）

Key Laboratory of Flexible Electronics (KLoFE) & Institute of Advanced Materials (IAM)

Cited 2|Views11

Abstract

Optoelectronic synapses have gained increasing attentions as a fundamental building block in the development of neuromorphic visual systems. However, it remains a challenge to integrate multiple functions into a single optoelectronic synapse that can be widely applied in wearable artificial intelligence and implantable neuromorphic vision systems. In this study, a stretchable optoelectronic synapse based on biodegradable ionic gelatin heterojunction is successfully developed. This device exhibits self-powered synaptic plasticity behavior with broad spectral response and excellent elastic properties, yet it degrades rapidly upon disposal. After complete cleavage, the device can be fully repaired within 1 min, which is mainly attributed to the non-covalent interactions between different molecular chains. Moreover, the recovery and reprocessing of the ionic gelatins result in optoelectronic properties that are virtually indistinguishable from their original state, showcasing the resilience and durability of ionic gelatins. The combination of biodegradability, stretchability, self-healing, zero-power consumption, ease of large-scale preparation, and low cost makes the work a major step forward in the development of biodegradable and stretchable optoelectronic synapses. An optoelectronic synapse based on an ionic gelatin heterojunction is presented, showcasing stretchability, self-healing capability, biodegradability, and self-powered features. Moreover, the synapse exhibits exceptional photoperception abilities, enabling it to respond to a wide range of light wavelengths, while also demonstrating typical synaptic behaviors. This work represents a significant advancement in the development of biodegradable and stretchable optoelectronic synapses. image

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Key words

biodegradability,ionic gelatin heterojunction,optoelectronic synapse,self-powered,stretchability

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