Huajing Fang,Liangliang Wu,Hailong Ma,Wenting Wu,Lingqi Wu,Yue Zhang,Hong Wang
Biomimetic devices as a game changer offer unprecedented possibilities in modern optical system, artificial intelligence and other frontier fields. So far, the integrated devices with both quantitative environmental perception and self-regulation abilities are still the challenges for improving the intelligent level of optoelectronic technology. Herein, we present a dual-function biomimetic eye based on the photoelectrochemical device for the first time. The rational design of the interfaces and organohydrogel electrolyte has revolutionized the functional integration of optoelectronic device. Anions and cations in the organohydrogel electrolyte are involved in photoelectric conversion and electrodeposition process respectively in different working modes. Hence, the obtained biomimetic eye can not only detect the light intensity in self-powered mode but also adjust its own light transmission according to the illumination conditions, adapting to the environment just like human eyes. Moreover, the organohydrogel electrolyte shows excellent thermal stability (−40 °C ∼ 60 °C) and a relatively wide operating voltage range, which enables the biomimetic eye to operate in harsh environments. This work possesses potential application prospects in bionic devices and provides a new route for developing multifunctional and durable photoelectrochemical devices.
Biomimetic eyes, with their excellent imaging functions such as large fields of view and low aberrations, have shown great potentials in the fields of visual prostheses and robotics. However, high power consumption and difficulties in device integration severely restrict their rapid development. In this study, an artificial synaptic device consisting of a molybdenum disulfide (MoS 2 ) film coated with an electron injection enhanced indium (In) layer is proposed to increase the channel conductivity and reduce the power consumption. This artificial synaptic device achieves an ultralow power consumption of 68.9 aJ per spike, which is several hundred times lower than those of the optical artificial synapses reported in literature. Furthermore, the multilayer and polycrystalline MoS 2 film shows persistent photoconductivity performance, effectively resulting in short-term plasticity, long-term plasticity, and their transitions between each other. A 5 × 5 In/MoS 2 synaptic device array is constructed into a hemispherical electronic retina, demonstrating its impressive image sensing and learning functions. This research provides a new methodology for effective control of artificial synaptic devices, which have great opportunities used in bionic retinas, robots, and visual prostheses.
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