A stacked crystal array includes a plurality of crystal slices and a plurality of interconnects. The interconnects have electrically conductive, spaced-apart and generally parallel elements joined by electrically conductive spacers extending generally orthogonally therebetween, the spacers being rotationally offset from each other by a predetermined angle. The array further includes a plurality of electrical insulators and an electrically insulative housing having a plurality of slots. The crystal slices, insulators and interconnects are arranged in the housing to form an assembly wherein the crystal slices are coupled together in a parallel electrical circuit. The assembly provides photon absorption comparable to a monolithic crystal having a thickness generally equivalent to the sum of the thicknesses of the crystal slices, but at a lower bias voltage.