Uncooled Infrared Bolometer Arrays
KTH-MST develops low-cost, uncooled infrared bolometer arrays for automotive and security applications using foundry-compatible 3D IC integrated MEMS technology in the framework of EU and nationally funded projects.
Within the framework of two EU funded FP7 projects, low-cost uncooled infrared imaging arrays for use in high-volume automotive applications are developed. 3D heterogeneous integration is used for the bolometer fabrication, allowing high-performance crystalline sensing materials to be integrated on top of CMOS based read-out electronic circuit (ROIC) wafers. The use of epitaxially grown, mono-crystalline Si/SiGe (quantum wells) with a high temperature coefficient of resistance (TCR) and low 1/f noise has the potential to increase the infrared bolometer performance (reduce the NETD). This increase in performance can be used to reduce the requirements on the vacuum levels in the infrared bolometer package, and thus, reduce the overall system costs. The 3D bolometer integration process uses only standard semiconductor materials and can be done in existing MEMS foundries. The Figures show bolometer structures that are manufactured using the 3D-MEMS integration platform from Faun AB and KTH-MST.
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