Solar cell and method for manufacturing the same, and method for forming impurity region

A method for manufacturing a solar cell, the method comprising:

• forming a first impurity layer and a second impurity layer on a substrate of a first conductive type, the first impurity layer containing impurities of a second conductive type opposite the first conductive type and the second impurity layer containing impurities of the first conductive type;
• forming a first impurity portion in a portion of the substrate on which the first impurity layer is formed and a second impurity portion in a portion of the substrate on which the second impurity layer is formed, by heating the substrate to diffuse the respective impurities into the substrate;
• forming a first high-doped impurity portion at the first impurity portion and having an impurity concentration higher than an impurity concentration of the first impurity portion by irradiating laser beams on a portion of the first impurity layer and a second high-doped impurity portion at the second impurity portion and having an impurity concentration higher than an impurity concentration of the second impurity portion by irradiating laser beams on a portion of the second impurity layer to diffuse the respective impurities into the substrate;
• and
• forming a first electrode connected to the first high-doped impurity portion and a second electrode connected to the second high-doped impurity portion.