Work

Additive manufacturing of interposers with curved vias for microelectronics packaging

Year: 2025

Type: article

Abstract: Advances in digital light processing now enable additive micro-manufacturing of parts on the centimeter scale, with features on the order of 10 µm. In this study, ceramic interposers were printed containing arrays of vias (holes), with diameters and pitches as small as 9 µm and 18 µm, respectively. The vias were subsequently metallized by melt infiltration to provide electric pathways. This technology enables unprecedented via routing, including curved and angled vias, offering new packaging options for the 3D integration of microelectronic subsystems. Two different interposer designs were demonstrated: 1) a curved interposer intended to connect a curved infrared detector with a planar read-out integrated circuit (ROIC); and 2) a fan-out interposer that spreads the pitch of an array of vias from 60 µm to 220 µm. These interposers require thousands of curved and angled vias, respectively, that cannot be realized using conventional microelectronics processing approaches.

Source: Additive manufacturing

DOI: 10.1016/j.addma.2025.104642