SOLAR CELL

摘要

The present invention relates to a solar cell. The solar cell according to one embodiment of the present invention comprises a substrate including a first conductive type impurity; an emitter part which is arranged on a first surface of the substrate and includes a second conductive type impurity opposite to the first conductive type impurity; a first electrode which is arranged on the emitter part to be electrically connected to the emitter part; a back surface protection film which is located on a second surface opposite to the first surface of the substrate and includes a plurality of holes arranged therein; a second electrode which is arranged on the back surface protection film and includes back surface electrode layers that are partially electrically connected to the substrate through the holes of the back surface protection film and a plurality of back surface bus bars that are arranged long in a first direction in the area where the holes of the back surface protection film are not formed and are electrically connected to the back surface electrode layers; and a plurality of back surface electric field parts which are arranged between the back surface electrode layers electrically connected to each other through the holes of the back surface protection film and the second surface of the substrate. In the second surface of the substrate, the ratio of the areas occupied by the back surface electric field parts per unit area in a first area adjacent to the back surface bus bars is greater than the ratio of the areas occupied by the back surface electric field parts per unit area in a second area spaced further from the back surface bus bars than the first area.