Simple through silicon interconnect via fabrication using dry filling of sub-micron Au particles for 3D MEMS

We developed a novel through silicon via (TSV) fabrication process using dry filling of sub-micron Au particle for stack type 3D MEMS. X-ray image shows that the slurry including Au particles was uniformly filled into vias with squeegee under low pressure in short time. TSV with a diameter of 30 μm and depth of 70μm were successfully fabricated. The resistance of single TSV was 0.11 Ω. The dielectric withstanding voltage of SiO2 insulating layer was about 150 V. The result indicates that high through put fabrication of TSV for 3D MEMS can be realized with a simple method.