An X-ray detector includes a substrate, a plurality of pixel electrodes on the substrate, a photoconductor covering the plurality of pixel electrodes, or a common electrode on the photoconductor. The photoconductor includes at least two photoconductor layers. The photoconductor may also include a current resistance layers disposed between the at least two photoconductor layers. The current resistance layer is configured to reduce current flow between the at least two photoconductor layers.