Patent ID: 8232654

Claim:
A semiconductor package comprising: a semiconductor chip having a semiconductor chip body including a circuit unit and a bonding pad disposed on a center portion of the semiconductor chip body to be connected to the circuit unit; a through-electrode formed through the semiconductor chip between a first surface and a second surface of the semiconductor chip, the through-electrode having a first electrode with a recessed portion formed therein and a second electrode disposed within the recessed portion, wherein the first and second electrodes each have a semi-circular extension portion at the first surface of the semiconductor chip, wherein sides of the second extension portion are curved so that an area of the second electrode at the first surface is greater than an area of the second electrode at the second surface, and wherein the sides of the first extension portion are curved so that a perimeter of the first extension portion at the first surface is greater than a perimeter of the first electrode at the second surface; and a re-distribution layer formed on a surface of the semiconductor chip body electrically connecting the bonding pad with the through-electrode, wherein the through-electrode passes through an edge portion of the semiconductor chip body.