Advances in machine vision based on two-dimensional photodetectors: device engineering and computational intelligence
摘要
Two-dimensional (2D) semiconductor-based photodetectors possess unique physical properties and flexible device architectures, showing tremendous potential for multidimensional optoelectronic information acquisition and intelligent perception. Compared with commercial photodetectors, 2D photodetectors can detect intensity, wavelength, polarization, and temporal information owing to the intrinsic properties of 2D materials. By integrating advanced device engineering with intelligent algorithms for processing multidimensional optical signals, 2D photodetectors enable information reconstruction within a single device, thereby advancing next-generation machine vision technologies. This review summarizes recent progress in machine vision based on 2D photodetectors. It first discusses the extension of sensing dimensions enabled by 2D material properties. It then examines device-level working mechanisms, including steady-state, synaptic, and spiking response modes. Next, it highlights algorithmic integration in applications such as spectrometry, image recognition, and motion detection. The review also discusses structural innovations for single-device optical field detection and outlines future directions in high-dimensional information fusion. By merging device engineering with computational intelligence, this work presents a framework for multidimensional perception and intelligent processing, and underscores the transformative role of 2D photodetectors in machine vision. Looking ahead, continued advances in device integration and algorithmic co-design are expected to enable efficient, real-time visual systems for complex environments.