Patent ID: 9222837
Filing Date: 2015-12-29
Classification: B81B,B81C,G01J,H01L

Abstract:
1. A black silicon-based high-performance MEMS thermopile infrared (IR) detector, comprising: a substrate, wherein: a releasing barrier band formed on the substrate; a thermal isolation cavity formed in the releasing barrier band; a black silicon-based IR absorber disposed above the thermal isolation cavity; the black silicon-based IR absorber set on the releasing barrier band; a number of thermocouples set around lateral sides of the black silicon-based IR absorber; the thermocouples around the black silicon-based IR absorber are electrically connected in series to form a thermopile; metallic electrodes are set beside the thermopile to output electrical signals; one-side terminals of the thermopile adjacent to the IR absorber form the hot junctions and the other-side terminals far away from the IR absorber form the cold junctions; the cold junctions of the thermopile are connected to the substrate through the first thermal-conductive-electrical-isolated structures as well as the heat conductor under the first thermal-conductive-electrical-isolated structures; the heat conductor is located outside the thermal isolation cavity but between the releasing barrier band and the substrate; the first thermal-conductive-electrical-isolated structures are embedded in the releasing barrier band; the hot junctions of the thermopile are in contact with the IR absorber through the second thermal-conductive-electrical-isolated structures; and the second thermal-conductive-electrical-isolated structures are located above the releasing barrier band, wherein the black silicon-based IR absorber is in square-morphology, and four groups of thermopiles are uniformly distributed around the lateral sides of the black silicon-based IR absorber.