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Tunable Negative and Positive Photoconductance in Van Der Waals Heterostructure for Image Preprocessing.
Advanced Materials 2024 May 3
The processing of visual information occurs mainly in the retina, and the retinal preprocessing function greatly improves the transmission quality and efficiency of visual information. The artificial retina system provides a promising path to efficient image processing. Here, we propose graphene/InSe/h-BN heterogeneous structure, which exhibits negative and positive photoconductance effects by altering the strength of a single wavelength laser. Moreover, we present a modified theoretical model based on the power-dependent photoconductivity effect of laser: I ph = - mP α 1 + nP α 2 $\rm I_{\rm ph}\,=\,\rm {-mP}^{\rm \alpha _{1}} + \rm {nP}^{\rm \alpha _{2}}$ , which can reveal the internal physical mechanism of negative/positive photoconductance effects. The present two-dimensional (2D) structure design allows the field effect transistor (FET) to exhibit excellent photoelectric performance (RNPC = 1.1× 104 A/w, RPPC = 13 A/w) and performance stability. Especially, the retinal pretreatment process is successfully simulated based on the negative and positive photoconductive effects. Moreover, the pulse signal input improves the device responsivity by 167%, and the transmission quality and efficiency of the visual signal can also be enhanced. This work provides a new design idea and direction for the construction of artificial vision, and lay a foundation for the integration of the next generation of optoelectronic devices. This article is protected by copyright. All rights reserved.
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