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 CdS-QDs 修饰的 InGaZnO 突触用于生物学上合理的彩色到灰色转换


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开发，以复制其基本特性。最近报道了基于光电神经形态设备的色觉对于物体识别、美学和交流等感知和认知行为非常重要。对不同波长光的响应主要取决于功率密度，而眼睛根据光度识别彩色图像。这封信介绍了一种基于 IGZO/CdS-QDs/PMMA 异质结的量子点 (QDs) 改性 InGaZnO (IGZO) 突触晶体管。这些基于 IGZO 的突触通过 QD 拓宽光谱，对 655 nm 光表现出显着的响应能力。更重要的是，该设备可以使用尖峰编码方案实现基于亮度的彩色到灰度转换，将彩色图像并行转换为灰度图像。值得注意的是，与原始设备相比，量子点修饰的基于 IGZO 的突触在多色 MNIST 数据集上的识别准确度显着提高了 34.3%。我们的结果表明，这种基于 IGZO 的可见光响应突触具有赋予神经形态视觉系统增强色觉的巨大潜力，并为颜色到灰色的转换提供了一种生物学上合理的方法。