LAUSR

Color image sensing by a smartphone or digital camera employ sensor elements with an array of color filters for capturing basic blue, green, and red color information. However, the normalized optical efficiency of such color filter-based sensor elements is limited to only 1/3. Optical detectors based on perovskites are described that can overcome this limitation. An efficient color sensor design has been proposed in this study that uses a vertically stacked arrangement of perovskite diodes. As compared to the conventional color filter-based sensors, the proposed sensor structure can potentially reach normalized optical efficiency approaching 100%. In addition, the proposed sensor design does not exhibit color aliasing or Color Moiré effect, which is one of the main limitations for the filter-based sensors. Furthermore, up to our knowledge, for the first time, it could be theoretically shown that both vertically arranged sensor and conventional color filter-based sensor provide almost comparable color errors. The optical properties of the perovskite materials are determined by optical measurements in combination with an energy shift model. The quantum efficiency of the stacked perovskite sensors is determined by 3D calculating the optical wave propagation using a finite-difference time-domain (FDTD) method. Finally, colorimetric characterization was carried out to determine the color error of the sensors.