Carrier structure and manufacturing method thereof

1. A carrier structure, comprising:

a glass substrate, having a first surface, a second surface opposite to the first surface, and at least one through hole penetrating through the glass substrate;

a buffer layer, disposed on the first surface and the second surface of the glass substrate;

an inner circuit layer, disposed on the buffer layer and in the through hole of the glass substrate, wherein the inner circuit layer exposes a part of the buffer layer, and a thickness of the buffer layer is less than a thickness of the inner circuit layer;

a first dielectric layer and a second dielectric layer, disposed on the glass substrate and filling up the through hole, wherein the first dielectric layer covers the first surface and a part of the inner circuit layer, and the second dielectric layer covers the second surface and a part of the inner circuit layer;

at least one first conductive via, penetrating through the first dielectric layer;

a first circuit layer, disposed on the first dielectric layer, and electrically connected to the inner circuit layer through the first conductive via;

at least one second conductive via, penetrating through the second dielectric layer; and

a second circuit layer, disposed on the second dielectric layer, and electrically connected to the inner circuit layer through the second conductive via.

2. The carrier structure as claimed in claim 1 , wherein the inner circuit layer and the glass substrate are respectively located at two opposite sides of the buffer layer.

3. The carrier structure as claimed in claim 1 , wherein the buffer layer directly contacts the glass substrate, and the buffer layer completely covers the first surface and the second surface of the glass substrate.

4. The carrier structure as claimed in claim 1 , further comprising:

a first solder mask layer, disposed on the first dielectric layer, and covering the first dielectric layer and a part of the first circuit layer; and

a second solder mask layer, disposed on the second dielectric layer, and covering the second dielectric layer and a part of the second circuit layer.

5. The carrier structure as claimed in claim 1 , wherein the buffer layer is disposed in the through hole of the glass substrate, and is located between the inner circuit layer and the glass substrate.

6. The carrier structure as claimed in claim 1 , wherein a material of the buffer layer comprises an inorganic material or an organic polymer material.

7. The carrier structure as claimed in claim 1 , wherein a thickness of the inner circuit layer is between 1 μm and 30 μm.

8. A manufacturing method of a carrier structure, comprising:

providing a glass substrate, wherein the glass substrate has a first surface, a second surface opposite to the first surface, and at least one through hole penetrating through the glass substrate;

forming a buffer layer on the first surface and the second surface of the glass substrate;

forming an inner circuit layer on the buffer layer and in the through hole of the glass substrate, wherein the inner circuit layer exposes a part of the buffer layer, and a thickness of the buffer layer is less than a thickness of the inner circuit layer;

pressing a first dielectric layer and a second dielectric layer to the glass substrate and filling up the through hole, wherein the first dielectric layer covers the first surface and a part of the inner circuit layer, and the second dielectric layer covers the second surface and a part of the inner circuit layer;

forming at least one first conductive via, wherein the first conductive via penetrates through the first dielectric layer;

forming a first circuit layer on the first dielectric layer, wherein the first circuit layer is electrically connected to the inner circuit layer through the first conductive via;

forming at least one second conductive via, wherein the second conductive via penetrates through the second dielectric layer; and

forming a second circuit layer on the second dielectric layer, wherein the second circuit layer is electrically connected to the inner circuit layer through the second conductive via.

9. The manufacturing method of the carrier structure as claimed in claim 8 , wherein the inner circuit layer and the glass substrate are respectively located at two opposite sides of the buffer layer.

10. The manufacturing method of the carrier structure as claimed in claim 8 , wherein the buffer layer directly contacts the glass substrate, and the buffer layer completely covers the first surface and the second surface of the glass substrate.

11. The manufacturing method of the carrier structure as claimed in claim 8 , further comprising:

forming a first solder mask layer on the first dielectric layer, wherein the first solder mask layer covers the first dielectric layer and a part of the first circuit layer; and

forming a second solder mask layer on the second dielectric layer, wherein the second solder mask layer covers the second dielectric layer and a part of the second circuit layer.

12. The manufacturing method of the carrier structure as claimed in claim 8 , wherein the buffer layer is disposed in the through hole of the glass substrate, and is located between the inner circuit layer and the glass substrate.

13. The manufacturing method of the carrier structure as claimed in claim 8 , wherein a material of the buffer layer comprises an inorganic material or an organic polymer material.

14. The manufacturing method of the carrier structure as claimed in claim 8 , wherein a thickness of the inner circuit layer is between 1 μm and 30 μm.