| abstract |
An integrated fan-out package includes a die, an encapsulant, a redistribution structure, a seed layer, conductive pillars, and a buffer layer. The encapsulant encapsulates the die. The redistribution structure is over the die and the encapsulant. The redistribution structure includes dielectric layers and conductive patterns. The dielectric layers are sequentially stacked and the conductive patterns are sandwiched between the dielectric layers. The seed layer and the conductive pillars are sequentially stacked over the redistribution structure. The seed layer is directly in contact with the conductive patterns closest to the conductive pillars. The buffer layer is disposed over the redistribution structure. The dielectric layer closest to the conductive pillars and the buffer layer are sandwiched between the seed layer and the conductive patterns closest to the conductive pillars. A Young's modulus of the buffer layer is higher than a Young's modulus of each of the dielectric layers of the redistribution structure. |