Method for producing joined body, and joining material

1. A method for producing a joined body, the method comprising:

a first step of preparing a laminated body which includes a first member having a metal pillar provided on a surface thereof, a second member having an electrode pad provided on a surface thereof and being disposed with the metal pillar and the electrode pad facing each other, and a joining material provided between the metal pillar and the electrode pad and containing metal particles and an organic compound; and

a second step of heating the laminated body to sinter the joining material at a predetermined sintering temperature,

wherein the joining material satisfies the condition of the following Formula (I)

( M 1 −M 2 )/ M 1 ×100≥1.0  (I)

wherein, in Formula (I), M 1 represents a mass of the joining material when a temperature of the joining material reaches the predetermined sintering temperature in the second step, and M 2 represents a non-volatile content in the joining material.

2. The method for producing a joined body according to claim 1 , wherein the organic compound includes at least one selected from the group consisting of an organic solvent having a boiling point of 300° C. or higher and a thermally decomposable resin of which a 5% by weight reduction temperature in a reducing atmosphere is 100° C. or higher.

3. The method for producing a joined body according to claim 2 , wherein the thermally decomposable resin includes at least one selected from the group consisting of polycarbonate, poly(meth)acrylic acid, poly(meth)acrylic acid ester, and polyester.

4. The method for producing a joined body according to claim 2 , wherein the total of a content of the organic solvent and a content of the thermally decomposable resin is 1.0% by mass or more on the basis of the total mass of the joining material.

5. The method for producing a joined body according to claim 1 , wherein the sintering temperature is 150 to 300° C.

6. The method for producing a joined body according to claim 1 , wherein in the second step, the joining material is sintered without pressurization or under a pressure of 0.1 MPa or less.

7. The method for producing a joined body according to claim 1 , wherein the metal particles include sub-micro copper particles having a volume average particle size of 0.11 to 0.80 μm and flake-shaped micro copper particles having a volume average particle size of 2.0 to 50 μm and an aspect ratio of 3.0 or more,

a content of the sub-micro copper particles is 30 to 90% by mass on the basis of the total mass of the metal particles, and

a content of the micro copper particles is 10 to 50% by mass on the basis of the total mass of the metal particles.

8. The method for producing a joined body according to claim 1 , wherein the organic compound in the joining material provided between the metal pillar and the electrode pad comprises an organic solvent having a boiling point of 300° C. or higher at a content of 1.0 to 20.0% by mass on the basis of the total mass of the joining material.

9. The method for producing a joined body according to claim 1 , wherein the organic compound in the joining material provided between the metal pillar and the electrode pad comprises a thermally decomposable resin of which a 5% by weight reduction temperature in a reducing atmosphere is 100° C. or higher at a content of 1.0 to 20.0% by mass on the basis of the total mass of the joining material.

10. A joining material being used for joining a metal pillar and an electrode pad, the joining material comprising:

metal particles; and

an organic compound including at least one selected from the group consisting of an organic solvent having a boiling point of 300° C. or higher and a thermally decomposable resin of which a 5% by weight reduction temperature in a reducing atmosphere is 100° C. or higher.

11. The joining material according to claim 10 , wherein the thermally decomposable resin includes at least one selected from the group consisting of polycarbonate, poly(meth)acrylic acid, poly(meth)acrylic acid ester, and polyester.

12. The joining material according to claim 10 , wherein the total of a content of the organic solvent and a content of the thermally decomposable resin is 1.0% by mass or more on the basis of the total mass of the joining material.

13. The joining material according to claim 10 , wherein the metal particles include sub-micro copper particles having a volume average particle size of 0.11 to 0.80 μm and flake-shaped micro copper particles having a volume average particle size of 2.0 to 50 μm and an aspect ratio of 3.0 or more,

a content of the sub-micro copper particles is 30 to 90% by mass on the basis of the total mass of the metal particles, and

a content of the micro copper particles is 10 to 50% by mass on the basis of the total mass of the metal particles.

14. The joining material according to claim 10 , wherein the joining material is used for joining the metal pillar and the electrode pad by being sintered at a sintering temperature of 150 to 300° C.

15. The joining material according to claim 10 , wherein the joining material is used for joining the metal pillar and the electrode pad by being sintered without pressurization or under a pressure of 0.1 MPa or less.

16. The joining material according to claim 10 , wherein the organic compound includes the organic solvent having a boiling point of 300° C. or higher at a content of 1.0 to 20.0% by mass on the basis of the total mass of the joining material.

17. The joining material according to claim 10 , wherein the organic compound includes the thermally decomposable resin of which a 5% by weight reduction temperature in a reducing atmosphere is 100° C. or higher at a content of 1.0 to 20.0% by mass on the basis of the total mass of the joining material.