Photodetector, display substrate including photodetector, method of fabricating photodetector, and display panel

A display substrate, comprising

• a base substrate, a photodetector on the base substrate, and a pixel unit on the base substrate, wherein
• the pixel unit includes a light-emitting device configured to emit light, and the photodetector includes a first electrode, a second electrode, a light-sensitive layer, and a light-trapping layer;
• the light-sensitive layer is between the first electrode and the second electrode, and the light-trapping layer is between the light-sensitive layer and the base substrate;
• the display substrate further includes a first barrier layer, the first barrier layer covers a top surface of the light-sensitive layer and a portion of a side surface of the light-sensitive layer, and the first barrier layer is configured to prevent ions in other layers of the display substrate from contaminating the light-sensitive layer.