Detection substrate and detection device

The invention provides a detection substrate and a detection device, and relates to the technical field of photoelectricity, the detection substrate comprises a substrate, a detection area and a non-detection area, the detection area and the non-detection area are arranged on one side of the substrate, the detection area comprises a plurality of detection units, and each detection unit comprises a thin film transistor; the photosensitive device is located on the side, away from the substrate, of the thin film transistor and comprises a first electrode, a photodiode and a second electrode which are sequentially arranged in a stacked mode, the first electrode is close to the thin film transistor, the first electrode and the second electrode are connected with the photodiode, and the first electrode is further connected with the first electrode of the thin film transistor; an insulating layer is arranged on the surface, away from the substrate, of the second electrode, no other film layer is arranged between the insulating layer and the second electrode, and in the orthographic projection on the substrate, the insulating layer located in the detection unit is not provided with a via hole.