Solar cell and manufacturing method thereof

A solar cell manufacturing method, comprising:

• a first step of forming an impurity diffusion layer, in which impurity elements of a second conductivity type are diffused, on one surface side of a semiconductor substrate of a first conductivity type;
• a second step of forming an antireflective film on the impurity diffusion layer;
• a third step of applying a first electrode material containing glass onto the antireflective film;
• a fourth step of forming a passivation film on an other surface side of the semiconductor substrate;
• a fifth step of forming, in at least part of the passivation film, a plurality of openings that reach the other surface side of the semiconductor substrate;
• a sixth step of applying a second electrode material containing impurity elements of the first conductive type so as to fill the openings and not to be in contact with the second electrode material of adjacent openings;
• a seventh step of applying a third electrode material onto the passivation film so as to be in contact with the entire second electrode material that is applied;
• and
• an eighth step for simultaneously forming, by heating the semiconductor substrate at a predetermined temperature after applying the first electrode material and the third electrode material,
• first electrodes that penetrate the antireflective film and are electrically connected to the impurity diffusion layer,
• a high-concentration region in the other surface side of the semiconductor substrate in which impurities of the first conductive type are diffused in higher concentration than in another region of the semiconductor substrate, and
• second electrodes and a third electrode that are electrically connected to the high-concentration region.