Printed circuit board and semiconductor package

A method for manufacturing a printed circuit board (PCB), comprising the steps of:

• providing a carrier substrate that includes a carrier layer, a release layer, and an aluminum layer;
• forming a first conductive layer on the carrier substrate;
• forming an insulating layer and a second conductive layer on the first conductive layer;
• forming contact plugs that penetrate into the insulating layer and that electrically connect the first conductive layer and the second conductive layer;
• separating the carrier layer and the aluminum layer from each other by separating the release layer into two sublayers, wherein a first sublayer of the release layer remains with the carrier layer and a second sublayer of the release layer remains with the aluminum layer,
• removing the separated carrier layer and the first sublayer of the release layer;
• forming an aluminum pattern, a first conductive pattern, and a second conductive pattern by respectively patterning the aluminum layer, the first conductive layer, and the second conductive layer, and removing the second sublayer of the release layer from the aluminum layer,
• forming a first solder resist layer on an upper surface of the insulating layer and a second solder resist layer on a lower surface of the insulating layer opposite to the upper surface, wherein the first solder resist layer includes at least one opening that exposes a part of the first conductive pattern and a part of the aluminum pattern;
• and
• forming a first passivation layer on an exposed surface of the first conductive pattern and a second passivation layer on an exposed surface of the second conductive pattern by an organic solderability preservative (OSP) surface treatment.