Disclosed herein is an apparatus suitable for detecting x-ray, comprising: an X-ray absorption layer comprising an electrode； an electronics layer, the electronics layer comprising: a substrate having a first surface and a second surface, an electronics system in or on the substrate, an electric contact on the first surface, a via, and a redistribution layer (RDL) on the second surface； wherein the RDL comprises a transmission line； wherein the via extends from the first surface to the second surface； wherein the electrode is electrically connected to the electric contact； wherein the electronics system is electrically connected to the electric contact and the transmission line through the via.
