According to an embodiment, a device (100) comprises: a direct conversion compound semiconductor layer (101) configured to convert high energy radiation photons into an electric current; an integrated circuit, IC, layer (102) situated next to the direct conversion compound semiconductor layer and configured to receive the electric current and process the electric current; and a substrate layer (103) situated next to the IC layer configured to conduct heat emitted from the IC layer; wherein the substrate layer comprises recesses (104) at corners of a cross section of the substrate; and wherein the substrate layer further comprises sliding electrical contacts (117) between the corners, wherein the sliding electrical contacts are connected to the IC layer through the substrate layer to receive the processed electric current. Other embodiments relate to a detector comprising an array of tiles according to the device, and an imaging system comprising: an x-ray source and the detector.