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A low-toxic colloidal quantum dots sensitized IGZO phototransistor array for neuromorphic vision sensors

Chen, Tong, Zhan, Shijie, Li, Benxuan, Hou, Bo ORCID: and Zhou, Hang 2024. A low-toxic colloidal quantum dots sensitized IGZO phototransistor array for neuromorphic vision sensors. Advanced Optical Materials 10.1002/adom.202302451
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The rapid development of optoelectronic devices with biomimetic synaptic behavior holds significant potential for neuromorphic visual applications. However, considerable challenges remain including convenient device fabrication and low toxicity materials innovation. Here, a heterojunction phototransistor is constructed using low-toxic CuZnInSSe (CIZS) colloidal quantum dots and amorphous InGaZnO (IGZO), which demonstrates high specific detectivity of 3.4 × 1015 Jones in visible light spectrum. Moreover, it is found that the photoresponse speed can be controlled via a ligand exchange treatment, through that the response speed can be adjusted from 0.3 to 11 s. This enables the device to operate in two distinct modes: a typical fast sensing mode and a neuromorphic visual mode. In the neuromorphic visual mode, the device's synaptic behavior can be tuned by manipulating light pulse intensity, frequency, wavelength, and gate voltage. As a demonstration, a phototransistor array effectively implements image pre-processing functions, including color recognition, visual memorizing, and forgetting.

Item Type: Article
Date Type: Published Online
Status: In Press
Schools: Physics and Astronomy
Publisher: Wiley
ISSN: 2195-1071
Funders: EPSRC and Royal Society
Date of First Compliant Deposit: 16 January 2024
Date of Acceptance: 15 January 2024
Last Modified: 03 Mar 2024 23:24

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