A Bioinspired Retinomorphic Device for Spontaneous Chromatic Adaptation

Area of Science:

• Materials Science
• Neuroscience
• Computer Science

Background:

• Chromatic adaptation is crucial for color image recognition, involving light spectrum sensing and preprocessing.
• Current complementary metal-oxide-semiconductor (CMOS) technology faces challenges in integrating sensing, memory, and processing for color images due to data redundancy and complex signal conversion.

Purpose of the Study:

• To develop a novel device inspired by the human retina that can simultaneously perform sensing, memory, and processing functions for color images.
• To overcome the limitations of existing technologies in efficient color image perception.

Main Methods:

• A 2D oxygen-mediated platinum diselenide (PtSe2) device was fabricated.
• The device's wavelength-dependent bipolar photoresponse and photoconductivity were analyzed.
• The mechanism involving photon-mediated adsorption/desorption of oxygen molecules on PtSe2 was investigated.

Main Results:

• The PtSe2 device demonstrated simultaneous sensing, memory, and processing capabilities for color images.
• The device exhibited a wavelength-dependent bipolar photoresponse and linear pulse-number dependence of photoconductivity.
• The proposed retinomorphic device achieved superior image classification accuracy (>90%) compared to independent pseudocolor channels (<75%).

Conclusions:

• The developed PtSe2 device mimics the human retina's chromatic adaptation for efficient color image processing.
• This technology offers a promising pathway for creating artificial vision perception systems with reduced architectural complexity and enhanced performance.