The properties of photoelectrochemical (PEC) cells have mainly been investigated with a focus on PEC hydrogenproduction. Because anodic current begins to flow when PEC cell is under illumination, and that this current varies as afunction of light intensity, PEC cells can be used as a photodetector. Different from other image sensors, PEC cells candetect the light immersed in solutions due to their PEC properties. To verify the feasibility of using silicon-based PECcell as an image sensor, we demonstrated a single pixel imaging system based on compressive sensing. Compressivesensing is an algorithm designed to recover signals from a small number of measurements, assuming that the signal ofinterest can be represented in a sparse way. In this study, we have demonstrated multispectral imaging using a siliconbasedPEC cell with compressive sensing. The images were obtained in three primary colors (red, green, and blue). Dueto the high photoresponse, stability and unique characteristic that silicon-based PEC cell can be used underwater, thesilicon-based PEC cell is expected to be utilized in the future as a photodetector for various applications. We believe thisstudy would be a great example of advanced developments in an optoelectronic system based on PEC cells.
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