Semiconductor device, manufacturing method for semiconductor device, electronic component, circuit substrate, and electronic apparatus

1. A semiconductor device comprising:

a semiconductor substrate including a first face and a second face on a side opposite to the first face;

an external connection terminal formed on the first face of the semiconductor substrate;

a first electrode formed on the first face of the semiconductor substrate and electrically connected to the external connection terminal;

an electronic element formed on or above the second face of the semiconductor substrate;

a second electrode formed on the first face of the semiconductor substrate, electrically connected to the electronic element, and having a top face and a rear face; and

a conductive portion formed in the semiconductor substrate and having an end face on the first face of the semiconductor substrate, wherein

the end face of the conductive portion is directly and electrically connected to part of the rear face of the second electrode.

2. The semiconductor device according to claim 1 , further comprising:

an interconnection formed on the first face of the semiconductor substrate and electrically connected to the first electrode and the external connection terminal; and

an insulating layer formed between the semiconductor substrate and the external connection terminal.

3. The semiconductor device according to claim 1 , further comprising:

a metal film formed on the top face of the second electrode and including an identical material of the interconnection.

4. The semiconductor device according to claim 1 , further comprising:

a connection electrode formed on the second face of the semiconductor substrate and electrically connected to the conductive portion.

5. An electronic component comprising:

a semiconductor substrate including a first face and a second face on a side opposite to the first face;

an external connection terminal formed on the first face of the semiconductor substrate;

a first electrode formed on the first face of the semiconductor substrate and electrically connected to the external connection terminal;

an electronic element formed on or above the second face of the semiconductor substrate;

a second electrode electrically connected to the electronic element and having a top face and a rear face;

a conductive portion formed in the semiconductor substrate and having an end face on the first face of the semiconductor substrate; and

a sealing member sealing the electronic element, wherein

the end face of the conductive portion is directly and electrically connected to part of the rear face of the second electrode.

6. The electronic component according to claim 5 , wherein the sealing member is spaced from the second face of the semiconductor substrate, and includes a facing face facing the second face of the semiconductor substrate, and the electronic element is formed on the facing face.

7. The electronic component according to claim 5 , further comprising:

a supporting substrate supporting the electronic element, wherein

the sealing member is spaced from the second face of the semiconductor substrate, and the supporting substrate is arranged between the sealing member and the semiconductor substrate.

8. The electronic component according to claim 5 , further comprising:

a supporting substrate spaced from the second face of the semiconductor substrate and supporting the electronic element, wherein

the sealing member seals the electronic element supported by the supporting substrate and includes an electronic element electrode electrically connected to the electronic element.

9. The electronic component according to claim 5 , further comprising:

a connection electrode formed on the second face of the semiconductor substrate and electrically connecting the conductive portion to the electronic element.

10. A circuit substrate on which the electronic component according to claim 5 is packaged.

11. An electronic apparatus in which the electronic component according to claim 5 is packaged.