An image sensor may include an organic photo-detector configured to selectively detect a near infrared wavelength spectrum of light and photoelectrically convert the detected near infrared wavelength spectrum of light, and a photo-detector array on the organic photo-detector, the photo-detector array including a photo-detector configured to detect a limited wavelength spectrum of visible light and photoelectrically convert the limited wavelength spectrum of visible light. The image sensor may discharge charges photoelectrically converted by the photo-detector to a first floating diffusion node, and the image sensor may discharge charges photoelectrically converted by the organic photo-detector to a second floating diffusion node. An area of the first floating diffusion node may be greater than an area of the second floating diffusion node.

In one example, an apparatus comprises: a semiconductor substrate including a front side surface, a first photodiode to generate a first charge, a second photodiode to generate a second charge, a barrier layer between the first photodiode and the second photodiode and configured to control flow of the second charge from the second photodiode to the first photodiode, and a drain region to store the first charge and at least a first part of the second charge. The apparatus further comprises a gate on the front side surface over a first channel region between the first photodiode and the drain region to control the flow of the first charge and the at least the first part of the second charge to the drain region, and a second channel region to conduct at least a second part of the second charge away from the barrier layer when the second photodiode saturates.

A radiographic detection substrate, a manufacture method thereof, and a radiographic detection device are provided. The radiographic detection substrate includes a substrate; and a thin film transistor and a signal storage unit which are formed on the substrate; the thin film transistor includes a gate electrode, an insulating layer, an active layer, a source electrode, a drain electrode and a passivation layer which are sequentially formed on the substrate; the signal storage unit includes a storage capacitor, the storage capacitor includes a first electrode and a second electrode, the first electrode is formed on the insulating layer and lapped with the drain electrode, the second electrode is connected to a ground line; the passivation layer is formed on the source electrode, the drain electrode, the first electrode and the ground line. The present invention efficiently decreases the number of masking processes by at least one connection method selected from lapping the first electrode and the drain electrode, connecting the second electrode to the ground line through the first via hole, and connecting the third electrode to the first electrode via the second via hole, to simplify the manufacture process of the radiographic detection substrate and reduce the manufacture costs.