Patent ID: 11869827
Assignee: SHANGHAI INTEGRATED CIRCUIT MANUVACTURING INNOVATION CENTER CO., LTD
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 5:
6. A method for manufacturing a three-dimensional capacitor-inductor based on a high-functional-density through silicon via structure, comprising steps of:
etching on a substrate to form a blind hole;
forming a first insulating layer in the blind hole and on a surface of the substrate;
forming layers of a three-dimensional capacitor on the first insulating layer, including sequentially depositing a first metal layer, a second insulating layer, and a second metal layer. and removing excessive parts of the second insulating layer and the second metal layer by photolithography and etching, to expose part of a surface of the first metal layer, then removing an excessive part of the first metal layer by photolithography and etching, so that part of the surface of the first insulating layer is exposed to form an under-bump-metal layer;
forming a third insulating layer to cover the second metal layer, the first metal layer, and the first insulating layer;
electroplating metal, and performing chemical mechanical polishing and dry etching to remove an excessive part of the metal, leaving only center-filled metal in the blind hole as a part of a three-dimensional inductor;
performing photolithography and etching on the third insulating layer, which is on the first metal layer and the second metal layer, so that the first metal layer and the second metal layer are respectively opened with a window, and forming test/connection bumps by electroplating and etching;
sputtering a seed layer on a surface of the center-filled metal of the blind hole, and forming test/connection bumps fir a three-dimensional inductor on the surface of the center-filled metal by photolithography, electroplating and etching;
forming temporary bonding to protect a front-surface pattern of the substrate, and mechanically grinding, polishing, and dry etching the back of the substrate to expose the back of the through silicon via, and removing parts of the first insulating layer, the first metal layer, the second insulating layer, and the second metal layer at the bottom of the through silicon via by dry etching until the center-filled metal is exposed;
forming back insulation, opening a window by photolithography and etching, and depositing thick metal and etching the thick metal to form interconnection, to form a planar thick metal rewiring part of the three-dimensional inductor; and
removing the temporary bonding, and performing packaging.