High-Robustness, Compact Bi2O2Se-Based NIR Retinal Sensor for Bionic Vision Systems

The near-infrared (NIR) vision system has demonstrated unique advantages in bionic vision, particularly excelling in low-light and complex environments. The retinal sensor, as the core input component of the bionic vision system, is critical to the overall performance of the system. Nevertheless, significant obstacles persist in achieving high robustness and high integration. Here, the study develops a dual-terminal optoelectronic detector based on an Au/Cr/Bi₂O₂Se/Cr/Au structure. Benefiting from high-quality Bi₂O₂Se nanosheets, the device exhibits a high photoresponsivity of 1.8 × 10³ A/W, a specific detectivity of 3.14 × 10¹¹ Jones, and an external quantum efficiency of 2.47 × 10⁵% at a wavelength of 915 nm. Furthermore, we developed a retinal sensor based on photodetectors. The exceptional photoresponsivity of the Bi₂O₂Se photodetectors significantly enhanced the robustness of the sensor. Additionally, we proposed a dual-mode architecture, offering a 72% reduction in the number of core components compared to traditional retinal sensor designs. More importantly, we apply the retinal sensor model to a bionic vision system, successfully achieving vehicle position recognition and gesture recognition tasks. This work provides a novel approach for designing next-generation retinal sensors, further advancing the development of bionic vision technology.