A solar cell and a method of forming the same are provided. The solar cell includes a substrate, and a plurality of unit cells each including a first electrode, an active layer, and a second electrode. The unit cells are spaced from one another to expose the substrate. Accordingly, using an insulating structure or non-power generation area where the unit cells are spaced from one another such that the substrate is exposed, it is possible to minimize leakage current, and to increase power generation efficiency.