Semiconductor chip manufacturing method, semiconductor chip, semiconductor device manufacturing method, and semiconductor device
View Patent ↗The invention provides a semiconductor chip manufacturing method, including a step of forming a front-surface-side concave portion in a semiconductor substrate having a front surface and a rear surface, a functional device being formed on the front surface, the front-surface-side concave portion being formed in the front surface and having a predetermined depth smaller than a thickness of the semiconductor substrate; a dummy plug forming step of supplying nonmetallic material into the front-surface-side concave portion and embedding a dummy plug made of the nonmetallic material; a thinning step of removing a part of the rear surface of the substrate and thinning the semiconductor substrate so that the thickness of the semiconductor substrate becomes smaller than the depth of the front-surface-side concave portion and so that the front-surface-side concave portion is formed into a through-hole; a dummy plug removing step of removing the dummy plug; and a step of supplying metallic material into the through-hole and forming a penetration electrode.
1. A semiconductor device comprising a first semiconductor chip and a second semiconductor chip,
the first semiconductor chip including:
a semiconductor substrate having a front surface and a rear surface;
a functional device formed on the front surface of the semiconductor substrate;
a penetration electrode, being electrically connected to the functional device, disposed in a through-hole penetrating the semiconductor substrate in a thickness direction beside the functional device, the penetration electrode establishing an electrical connection between the front surface and the rear surface of the semiconductor substrate; and
a bump being formed integrally with the penetration electrode and jutting from the front surface of the semiconductor substrate,
the second semiconductor chip including a wiring member, being formed on one surface of the second semiconductor chip facing the front surface of the semiconductor substrate, and bonded with the bump of the first semiconductor chip, wherein the bump is made of a same material as the penetration electrode.
2. A semiconductor device according to claim 1 ,
wherein the penetration electrode is made of metal, and
wherein a continuous diffusion preventing film is formed on a surface of the penetration electrode and on the bump, the diffusion preventing film being made of material by which metal atoms constituting the penetration electrode can be prevented from being diffused to the semiconductor substrate.