Analytical Study on the Effect of Perovskite Layer Thickness on Photo-capacitor Device for Retinomorphic Sensor Application

A retinomorphic sensor is a kind of image sensor inspired by the biological structure and function of the human retina. The sensor is promising to be used in autonomous vehicle applications and neuromorphic computation due to its rapid responses to brightness changes and low power consumption. A photo-capacitor device is utilized in retinomorphic sensors to characterize the response to light intensity changes. It works to detect light and adjust the capacitance value depending on the intensity of the light it receives. The simulation in this study uses a photo-capacitor with a bi-layer dielectric structure, with a perovskite layer acting as the light-responsive layer and a silicon dioxide layer acting as the light-unresponsive layer. The impact of perovskite layer thickness has been analyzed to discover how the electric field responds at various wavelengths. The findings demonstrate that a perovskite thickness greater than 300 nm can provide a higher electric field dispersion than one less than 300 nm. It is observed that the electric field is also proportional to the absorbance of devices. For various wavelengths, the peak of the electric field is distributed randomly.