Manufacturing method of semiconductor device

1. A manufacturing method of a semiconductor device, comprising the steps of:

preparing a mother chip and a daughter chip,

the mother chip including a first substrate

first electrodes and second electrodes,

a first passivation film formed on the first substrate and having openings exposing upper surfaces of the first and second electrodes;

first barrier metal formed on the upper surface of the first and second electrodes, respectively, and on the first passivation film,

first metal posts formed on the first barrier metal of the first and second electrodes, respectively, and

solder balls on the first metal posts above the first electrodes;

the daughter chip including a second substrate

third electrodes,

a second passivation film formed on the second substrate and having openings exposing upper surfaces of the third electrodes;

second barrier metal formed on the upper surface of the third electrodes, respectively, and on the second passivation film;

second metal posts on the second barrier metal of the third electrodes, respectively, and

making flip chip bonding of a daughter chip on the mother chip to electrically connect the second metal posts to the first metal posts for the second electrodes, respectively, and making flip chip bonding of the mother chip on a circuit board using the solder balls.

2. The manufacturing method of a semiconductor device according to claim 1 , wherein an upper surface of the first passivation film is made higher relatively to the upper surfaces of the first and second electrodes, and the whole of the upper surface of each first metal post is made higher relatively to the upper surface of the first passivation film;

wherein an upper surface of the second passivation film is made higher relatively to the upper surfaces of the third electrodes, and the whole of the upper surface of each second metal post is made higher relatively to the upper surface of the second passivation film.

3. The manufacturing method of a semiconductor device according to claim 1 , wherein the step of making flip chip bonding of the daughter chip includes the step of heating joint members of solder provided between the second metal posts and the first metal posts.

4. The manufacturing method of a semiconductor device according to claim 3 , before the step of making flip chip bonding of the daughter chip, the joint members of solder is formed on the second metal posts.