A solar cell is discussed. The solar cell includes a substrate of a first conductivity type, the substrate having a via hole, an emitter disposed at the substrate and having a second conductivity type opposite the first conductivity type, an anti-reflection layer disposed on a first surface of the substrate and inside the via hole, a first electrode disposed on the first surface of the substrate and in the via hole, a first electrode bus bar disposed on a second surface of the substrate that is opposite the first surface and in the via hole, and a second electrode disposed on the second surface of the substrate and connected to the substrate.