| 摘要 |
<p>The present invention relates to a solar cell capable of improving the efficiency of the entire solar cell since contact resistance is reduced and a filling ratio is improved, as a contact area between a front-surface electrode layer and a rear-surface electrode layer is improved. The solar cell according to one embodiment comprises: a support substrate; a rear-surface electrode layer disposed on the support substrate; a light absorption layer disposed on the rear-surface electrode layer; a buffer layer disposed on the light absorption layer; and a front-surface electrode layer disposed on the a buffer layer. A first through groove passing through the rear-surface electrode layer is formed on the rear-surface electrode layer, a second through groove passing through the buffer layer and the light absorption layer is formed on the buffer layer, and a front surface and a side surface are exposed by the second through groove. The solar cell according to the other embodiment comprises: a support substrate; a rear-surface electrode layer disposed on the support substrate, a light absorption layer disposed on the rear-surface electrode layer; and a front-surface electrode layer disposed on the light absorption layer. A first through groove passing through the rear-surface electrode layer is formed on the rear-surface electrode layer, and a second through groove passing through the buffer layer and the light absorption layer, and overlapping the first through groove is formed on the buffer layer. The front-surface electrode layer includes a first front-surface electrode layer disposed inside the second through groove; and a second front-surface electrode layer formed in an overlapping area between the first through groove and the second through groove.</p> |
