Wednesday, May 2025
11:20 AM - 11:40 AM
Room: LL20D
Session: Emerging Medical Sensing and Displays II
CMOS-Compatible Artificial Photoreceptor Combining Photodiodes and Anti-Ferroelectric FETs for Continuous-to-Spike Light Signal Conversion
Description:
This study proposes an artificial retina device that utilizes complementary metal oxide Semiconductor(CMOS)-compatible materials (signal crystalline-Si, poly crystalline-Si, Hafnium-zirconium-oxide) to convert incoming optical signals into spike signals resembling those of biological optic nerves. The device integrates a photodiode and an Anti-Ferroelectric FET (AFeFET), functioning as the optic nerve and neuron, respectively. The photodiode adjusts its resistance based on light intensity, which in turn delays or accelerates the firing time (10~150 ms) of the AFeFET. The resulting spike signals are analyzable in the frequency domain and exhibit high linearity with light intensity (R²=0.998), enabling the transformation of images into the frequency domain without distortion. This novel approach offers excellent compatibility with CMOS fabrication processes, allowing large-scale integration, and demonstrates significant potential for artificial vision systems and advanced image processing applications. The findings contribute to the development of next-generation neuromorphic systems.