Semiconductor chip manufacturing method, semiconductor chip, semiconductor device manufacturing method, and semiconductor device

1. A method for manufacturing a semiconductor chip, comprising:

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 in the front-surface-side concave portion;

a thinning step of, subsequent to the dummy plug forming step, removing a part of the rear surface of the semiconductor 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 that penetrates the semiconductor substrate;

a dummy plug removing step of removing the dummy plug provided in the through-hole; and

a step of, subsequent to the dummy plug removing step, supplying metallic material into the through-hole and forming a penetration electrode that establishes an electrical connection between a front surface side and a rear surface side of the semiconductor substrate and that is electrically connected to the functional device.

2. A method for manufacturing a semiconductor chip according to claim 1 , further comprising a step of forming a wiring member that is in contact with an exposed surface of the dummy plug on the front surface side of the semiconductor substrate and that is electrically connected to the functional device, the step of forming a wiring member being carried out subsequent to the dummy plug forming step and being carried out prior to the dummy plug removing step.

3. A method for manufacturing a semiconductor chip according to claim 1 , wherein

the dummy plug forming step includes

a photosensitive resin filling step of filling an inside of the front-surface-side concave portion with photosensitive resin having nonconductivity as the nonmetallic material so as to form the dummy plug made of the photosensitive resin, and

an exposure step of exposing the dummy plug to light so that a predetermined outer peripheral part of the dummy plug along a whole inner wall surface of the front-surface-side concave portion is insoluble in a predetermined etching medium and so that a central part of the dummy plug inward from the outer peripheral part is soluble in the predetermined etching medium, and

the dummy plug removing step includes

a development step of removing the central part of the dummy plug according to etching using the predetermined etching medium.

4. A method for manufacturing a semiconductor device, comprising:

a semiconductor chip producing step of producing a plurality of semiconductor chips; and

a stacking step of stacking the plurality of semiconductor chips together,

the semiconductor chip producing step 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 in the front-surface-side concave portion;

a thinning step of, subsequent to the dummy plug forming step, removing a part of the rear surface of the semiconductor 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 that penetrates the semiconductor substrate;

a dummy plug removing step of removing the dummy plug provided in the through-hole; and

a step of, subsequent to the dummy plug removing step, supplying metallic material into the through-hole and forming a penetration electrode that establishes an electrical connection between a front surface side and a rear surface side of the semiconductor substrate and that is electrically connected to the functional device.

5. A method for manufacturing a semiconductor device, comprising:

a step of forming a front-surface-side concave portion in a first 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 first 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 in the front-surface-side concave portion;

a stacking step of stacking the first semiconductor substrate on a second semiconductor substrate while causing the front surface of the first semiconductor substrate in which the dummy plug is formed to face one surface of the second semiconductor substrate;

a thinning step of removing a part of the rear surface of the first semiconductor substrate stacked on the second semiconductor substrate and thinning the first semiconductor substrate so that the thickness of the first 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 that penetrates the first semiconductor substrate;

a dummy plug removing step, subsequent to the thinning step, of removing the dummy plug provided in the through-hole; and

a metallic material supplying step of, subsequent to the dummy plug removing step, supplying metallic material into the through-hole and forming a penetration electrode that establishes an electrical connection between a front surface side and a rear surface side of the first semiconductor substrate and that is electrically connected to the functional device.

6. A method for manufacturing a semiconductor device according to claim 5 , further comprising a step of, prior to the stacking step, forming a dummy bump that juts from the front surface of the first semiconductor substrate and that comes in contact with the dummy plug, wherein:

the second semiconductor substrate includes a wiring member provided on the one surface of the second semiconductor substrate;

the stacking step including:

a dummy bump contact step of bringing the dummy bump into contact with the wiring member of the second semiconductor substrate; and

a step of disposing tracing material in such a manner as to cover a periphery of the dummy bump being in contact with the wiring member of the second semiconductor substrate,

the dummy plug removing step including:

a step of removing the dummy bump, and

the metallic material supplying step including:

a step of supplying metallic material to a space that communicates with the through-hole and that is defined by the tracing material and forming a bump that is formed integrally with the penetration electrode and that juts from the front surface of the first semiconductor substrate.

7. A method for manufacturing a semiconductor device according to claim 6 , wherein the wiring member includes a penetration electrode that penetrates the second semiconductor substrate in a thickness direction thereof, and the dummy bump contact step includes a step of bringing the dummy bump into contact with the penetration electrode penetrating the second semiconductor substrate.

8. A method for manufacturing a semiconductor chip, the method comprising:

a step of forming a front-surface-side concave portion in a semiconductor substrate having a front surface and a rear surface, a light emitting element or a light receiving element 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 a filler into the front-surface-side concave portion and embedding a dummy plug made of the filler in the front-surface-side concave portion;

a thinning step of, subsequent to the dummy plug forming step, removing a part of the rear surface of the semiconductor 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 that penetrates the semiconductor substrate; and

a dummy plug removing step of, subsequent to the thinning step, removing the dummy plug provided in the through-hole.