Method of manufacturing circuit board and chip package and circuit board manufactured by using the method

1. A method of manufacturing a circuit board, the method comprising:

preparing a base substrate comprising a core layer and a first conductive layer that is formed on at least one surface of the core layer and comprises an internal circuit pattern;

forming a build-up material to cover the first conductive layer;

forming a metal layer on an outer surface of the build-up material facing the base substrate;

removing a portion of the metal layer in which at least one cavity is to be formed;

forming in the build-up material the at least one cavity through which the core layer and the first conductive layer are exposed;

forming a laminated body by curing the build-up material in which the at least one cavity is formed; and

forming a second conductive layer comprising an external circuit pattern on an outer surface of the laminated body by removing another portion of the metal layer,

wherein the forming the at least one cavity comprises using wet etching to remove the build-up material exposed in a portion in which the at least one cavity is to be formed by using a solution.

2. The method of claim 1 , wherein the build-up material comprises a matrix in which a structural body is impregnated, and the matrix comprises a thermosetting resin in a B-stage.

3. The method of claim 2 , wherein the forming the laminated body comprises applying heat to perform cross-linking on the thermosetting resin in the B-stage and to obtain a thermosetting resin in a C-stage.

4. The method of claim 3 , wherein a weight of the thermosetting resin in the B-stage is less than a weight of the thermosetting resin in the C-stage.

5. The method of claim 1 , wherein a process temperature for forming the build-up material is lower than a process temperature for curing the build-up material.

6. The method of claim 1 , wherein the solution comprises a glass etching agent.

7. The method of claim 1 , wherein the core layer is formed of the same material as a material of the laminated body.

8. The method of claim 1 , wherein the core layer is formed of the same material as a material forming the build-up material, and

wherein, before the build-up material is cured to form the laminated body, the material in the buildup material is in a stage different from a stage where the material forming the core layer is in terms of temperature.

9. The method of claim 1 further comprising:

mounting a semiconductor chip in the at least one cavity and electrically connecting the semiconductor chip and at least one of the first and second conductive layers.

10. The method of claim 9 , wherein the build-up material comprises a matrix in which a structural body is impregnated, and the matrix comprises a thermosetting resin in a B-stage.

11. The method of claim 10 , wherein the forming the laminated body comprises applying heat to perform cross-linking on the thermosetting resin in the B-stage and to obtain a thermosetting resin in a C-stage.

12. The method of claim 11 , wherein a weight of the thermosetting resin in the B-stage is less than a weight of the thermosetting resin in the C-stage.

13. The method of claim 9 , wherein the forming the at least one cavity comprises using wet etching to remove the build-up material exposed in a portion in which the at least one cavity is to be formed by using a solution.

14. A circuit board manufactured by using the method of claim 1 .

15. A circuit board manufactured by using the method of claim 2 .

16. A circuit board manufactured by using the method of claim 3 .

17. A circuit board manufactured by using the method of claim 8 .