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An Active‐Matrix Synaptic Phototransistor Array for In‐Sensor Spectral Processing
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An Active‐Matrix Synaptic Phototransistor Array for In‐Sensor Spectral Processing
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Journal Article
An Active‐Matrix Synaptic Phototransistor Array for In‐Sensor Spectral Processing
2024
Overview
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. This study introduces retinomorphic active‐matrix synaptic phototransistor array based on metal oxide/organic semiconductor heterojunctions, incorporating in‐sensor chromatic color‐opponent processing. The dual photogates enable synaptic color‐opponent processing with a high current dynamic range exceeding 90 dB. The array enables spatial chromatic contrast imaging and dynamic trajectory capture for efficient artificial color perception.
Publisher
John Wiley & Sons, Inc,John Wiley and Sons Inc,Wiley
