Semiconductor device having magnetic alignment marks and underfill resin layers
A semiconductor device includes a semiconductor element, a connection electrode formed on the semiconductor element, and alignment marks formed on the semiconductor element. At least one of the alignment marks is made of a magnetic material.
1. A semiconductor device comprising:
a first semiconductor element;
a first connection electrode formed on the first semiconductor element;
a first alignment mark formed on the first semiconductor element, wherein the first alignment mark includes magnetic material;
a second semiconductor element;
a second connection electrode formed on the second semiconductor element, wherein the second connection electrode contacts the first connection electrode;
a second alignment mark formed on the second semiconductor element, wherein the second alignment mark includes magnetic material; and
a first underfill resin layer and a second underfill resin layer disposed between a first surface of the first alignment mark and a first surface of the second alignment mark in a direction perpendicular to a first surface of the first semiconductor element on which the first alignment mark is formed,
wherein,
the first surface of the first alignment mark is parallel to the first surface of the second alignment mark,
the first underfill resin layer contacts the first surface of the first alignment mark and the second underfill resin layer,
the second underfill resin layer contacts the first surface of the second alignment mark and the first underfill resin layer,
a height of the first alignment mark from the first surface of the first semiconductor element is less than a height of the first connection electrode from the first surface of the first semiconductor element,
the height of the first alignment mark from the first surface of the first semiconductor element is greater than the first surface on which the first connection electrode is formed,
a height of the second alignment mark from a first surface of the second semiconductor element is equal to or less than a height of the second connection electrode from the first surface of the second semiconductor element, and
the height of the second alignment mark from the first surface of the second semiconductor element is greater than the first surface of the second semiconductor element on which the second connection electrode is formed.
2. The semiconductor device according to claim 1 , wherein a magnetic polarity of the first alignment mark is opposite to a magnetic polarity of the second alignment mark.
3. The semiconductor device according to claim 1 , wherein the magnetic material contains at least one selected from Fe, Co, and Ni.
4. The semiconductor device according to claim 1 , wherein a plurality of alignment marks that include the magnetic material are formed at two or more locations on the first semiconductor element.
5. The semiconductor device according to claim 1 , wherein the underfill resin layer covers a side surface of the first and second alignment marks.
6. The semiconductor device according to claim 1 , wherein a gap exists between the first surface of the first alignment mark and the first surface of the second alignment mark in the direction perpendicular to the first surface of the first semiconductor element on which the first alignment mark is formed in a first configuration, and the first surface of the first alignment mark contacts the first surface of the second alignment mark in the direction perpendicular to the first surface of the first semiconductor element on which the first alignment mark is formed in a second configuration.
7. The semiconductor device according to claim 1 , further including a barrier layer between the first connection electrode and the first semiconductor element.
8. An electronic apparatus, comprising:
an optical system;
a solid-state imaging device, wherein the solid-state imaging device is configured to receive light from the optical system, the solid-state imaging device including:
a first semiconductor element;
a first connection electrode formed on the first semiconductor element;
a first alignment mark formed on the first semiconductor element, wherein the first alignment mark includes magnetic material;
a second semiconductor element;
a second connection electrode formed on the second semiconductor element, wherein the second connection electrode contacts the first connection electrode;
a second alignment mark formed on the second semiconductor element, wherein the second alignment mark includes magnetic material; and
a first underfill resin layer and a second underfill resin layer disposed between a first surface of the first alignment mark and a first surface of the second alignment mark in a direction perpendicular to a first surface of the first semiconductor element on which the first alignment mark is formed,
wherein,
the first surface of the first alignment mark is parallel to the first surface of the second alignment mark,
the first underfill resin layer contacts the first surface of the first alignment mark and the second underfill resin layer,
the second underfill resin layer contacts the first surface of the second alignment mark and the first underfill resin layer,
a height of the first alignment mark from the first surface of the first semiconductor element is less than a height of the first connection electrode from the first surface of the first semiconductor element,
the height of the first alignment mark from the first surface of the first semiconductor element is greater than the first surface on which the first connection electrode is formed,
a height of the second alignment mark from a first surface of the second semiconductor element is equal to or less than a height of the second connection electrode from the first surface of the second semiconductor element, and
the height of the second alignment mark from the first surface of the second semiconductor element is greater than the first surface of the second semiconductor element on which the second connection electrode is formed;
a drive circuit configured to drive the solid-state imaging device; and
a signal processing circuit configured to process an output of the solid-state imaging device.
9. The electronic apparatus according to claim 8 , wherein a magnetic polarity of the first alignment mark is opposite to a magnetic polarity of the second alignment mark.
10. The electronic apparatus according to claim 8 , wherein the magnetic material contains at least one selected from Fe, Co, and Ni.
11. The electronic apparatus according to claim 8 , wherein a plurality of alignment marks that include the magnetic material are formed at two or more locations on the first semiconductor element.
12. The electronic apparatus according to claim 8 , wherein the underfill resin layer covers a side surface of the first and second alignment marks.
13. The electronic apparatus according to claim 8 , wherein a gap exists between the first surface of the first alignment mark and the first surface of the second alignment mark in the direction perpendicular to the first surface of the first semiconductor element on which the first alignment mark is formed in a first configuration, and the first surface of the first alignment mark contacts the first surface of the second alignment mark in the direction perpendicular to the first surface of the first semiconductor element on which the first alignment mark is formed in a second configuration.
14. The electronic apparatus according to claim 8 , further including a barrier layer between the first connection electrode and the first semiconductor element.