Advanced Science (Oct 2024)

An Active‐Matrix Synaptic Phototransistor Array for In‐Sensor Spectral Processing

  • Dingwei Li,
  • Yitong Chen,
  • Huihui Ren,
  • Yingjie Tang,
  • Siyu Zhang,
  • Yan Wang,
  • Lixiang Xing,
  • Qi Huang,
  • Lei Meng,
  • Bowen Zhu

DOI
https://doi.org/10.1002/advs.202406401
Journal volume & issue
Vol. 11, no. 39
pp. n/a – n/a

Abstract

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Abstract The human retina perceives and preprocesses the spectral information of incident light, enabling fast image recognition and efficient chromatic adaptation. In comparison, it is reluctant to implement parallel spectral preprocessing and temporal information fusion in current complementary metal‐oxide‐semiconductor (CMOS) image sensors, requiring intricate circuitry, frequent data transmission, and color filters. Herein, an active‐matrix synaptic phototransistor array (AMSPA) is developed based on organic/inorganic semiconductor heterostructures. The AMSPA provides wavelength‐dependent, bidirectional photoresponses, enabling dynamic imaging and in‐sensor spectral preprocessing functions. Specifically, near‐infrared light induces inhibitory photoresponse while UV light results in exhibitory photoresponse. With rational structural design of the organic/inorganic hybrid heterostructures, the current dynamic range of phototransistor is improved to over 90 dB. Finally, a 32 × 64 AMSPA (128 pixels per inch) is demonstrated with one‐switch‐transistor and one‐synaptic phototransistor (1‐T‐1‐PT) structure, achieving spatial chromatic enhancement and temporal trajectory imaging. These results reveal the feasibility of AMSPA for constructing artificial vision systems.

Keywords