부산대학교 도서관

A Package-on-Package (POP) semiconductor package has a structure in which a second semiconductor package is stacked on a first semiconductor package. A plurality of spacers are disposed between a first substrate of the first semiconductor package and a second substrate of the second semiconductor package so as to maintain a gap between the first substrate and the second substrate. The plurality of spacers may project from a bottom surface of the second substrate toward the first substrate, or may project from a top surface of the first substrate toward the second substrate. When an upper molding layer is formed on the second substrate so as to cover a second semiconductor chip, the plurality of spacers may be connected to the upper molding layer via through holes that vertically pass through the second substrate. When a first semiconductor chip is adhered to the top surface of the first substrate with an adhering layer, the plurality of spacers may be connected to the adhering layer on the top surface of the first substrate.