Method of manufacturing semiconductor device, semiconductor device, circuit substrate and electronic apparatus

1. A method of manufacturing a semiconductor device having electrodes penetrating a semiconductor substrate, the method comprising the steps of:

forming a concave portion extending from an active surface of a semiconductor substrate on which an integrated circuit is formed to an interior of the semiconductor substrate;

forming a first insulating layer on an inner surface of the concave portion;

filling an inner side of the first insulating layer with an electroconductive material so as to form an electrode;

exposing a distal end portion of the first insulating layer by etching a rear surface of the semiconductor substrate;

forming a second insulating layer on the rear surface of the substrate; and

exposing the distal end portion of the electrode by removing the first insulating layer and the second insulating layer from a distal end portion of the electrode,

wherein a cross-sectional area of the distal end portion is made equal to or smaller than a cross-sectional area of the electrode at the active surface of the substrate.

2. A method of manufacturing a semiconductor device according to claim 1 , further comprising a step of attaching, before the rear surface of the semiconductor substrate is etched, a reinforcing member that reinforces the semiconductor substrate to the active surface of the semiconductor substrate via a hardening adhesive agent.

3. A method of manufacturing a semiconductor device according to claim 1 , further comprising the steps of:

forming, before the electrode is formed, a barrier layer that prevents the electroconductive material from spreading to the semiconductor substrate on an interior side of the first insulating layer; and

exposing the distal end portion of the electrode by removing the barrier layer at the distal end portion of the electrode at the same time as removing the first insulating layer and the second insulating layer at the distal end portion of the electrode.

4. A method of manufacturing a semiconductor device according to claim 1 , wherein, in the step of forming the second insulating layer, a coating of silicon oxide or silicon nitride that constitutes the second insulating layer is formed using a CVD method.

5. A method of manufacturing a semiconductor device according to claim 1 , wherein, in the step of forming the second insulating layer, a liquid SOG or polyimide that is a base material of the second insulating layer is coated using a spin coating method.

6. A method of manufacturing a semiconductor device according to claim 1 , wherein the step for forming the electrode further comprising the steps of:

forming an electrode distal end portion formed from a first electroconductive material on a bottom surface of the concave portion on an inner side of the first insulating layer; and

forming an electrode body that is formed from a second electroconductive material and is connected to the electrode distal end portion on an inner side of the first insulating layer, and

wherein, in the step of exposing the electrode, the electrode distal end portion is exposed by removing the first insulating layer that is formed on top of a distal end surface of the electrode distal end portion, and

wherein the first electroconductive material is less readily oxidized than the second electroconductive material.

7. A method of manufacturing a semiconductor device according to claim 6 , wherein, in the step of forming the electrode distal end portion, a liquid body containing the first electroconductive material is discharged using a droplet discharge apparatus onto the bottom surface of the concave portion on an inner side of the first insulating layer, and the discharged liquid body is then baked.

8. A method of manufacturing a semiconductor device according to claim 1 , further comprising the step of forming an electrode pad before the step of forming the concave portion.

9. A method of manufacturing a semiconductor device according to claim 1 , wherein the electrode has a stepped cross-section.