The energy-efficient perceptual capabilities of the human visual system have inspired the development of optoelectronic neuromorphic devices to replicate the essential properties. Color vision that is highly important for perception and cognitive behaviors, such as object recognition, esthetics, and communication, has recently been reported based on optoelectronic neuromorphic devices. The responses to different wavelengths of light are mainly dependent on power density, whereas the eye recognizes color images based on luminosity. This Letter presents a quantum dots (QDs) modified InGaZnO (IGZO) synaptic transistor based on an IGZO/CdS-QDs/PMMA heterojunction. These IGZO-based synapses show significant responsivity to 655-nm light through the spectrum broadening by QDs. More importantly, luminance-based color-to-gray conversion can be realized with this device using a spike encoding scheme, transforming color images into grayscale in parallel. Notably, the QDs modified IGZO-based synapses demonstrated a remarkable 34.3% improvement in recognition accuracy on the multicolor MNIST dataset in comparison with the pristine devices. Our results indicate that this visible-light responsive IGZO-based synapse has great potential for endowing the neuromorphic visual system with enhanced color vision and provides a biologically plausible approach for color-to-gray conversion.

中文翻译：

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可见光响应性 CdS-QDs 修饰的 InGaZnO 突触，用于生物学上合理的色灰转换


人类视觉系统的节能感知能力激发了光电神经形态设备的发展，以复制其基本特性。最近基于光电神经形态器件报道了对感知和认知行为（如物体识别、审美和交流）非常重要的色觉。对不同波长光的响应主要取决于功率密度，而眼睛则根据光度识别彩色图像。本信介绍了一种基于 IGZO/CdS-QD/PMMA 异质结的量子点 （QD） 修饰的 InGaZnO （IGZO） 突触晶体管。这些基于 IGZO 的突触通过 QD 的光谱展宽对 655 nm 光表现出显着的响应性。更重要的是，该器件可以使用尖峰编码方案实现基于亮度的色灰转换，将彩色图像并行转换为灰度。值得注意的是，与原始设备相比，QD 修饰的基于 IGZO 的突触在多色 MNIST 数据集上的识别准确率显著提高了 34.3%。我们的结果表明，这种基于可见光反应的 IGZO 突触具有赋予神经形态视觉系统增强色觉的巨大潜力，并为色到灰度的转换提供了一种生物学上合理的方法。