NOVELTY - The cell has a base substrate (30) including a surface (11) onto which sunlight is incident and another surface opposite to the former surface. A doped pattern is provided on the latter surface of the substrate. A contact layer (730) is provided on the doped pattern. An electrode (530) is provided on the contact layer, and is electrically connected to the doped pattern. An insulating layer (330) is provided on the latter surface, where the insulating layer exposes the doped pattern. A passivation layer is provided between the latter surface of the substrate and the insulating layer.    USE - Solar cell for converting sunlight into electricity using a photovoltaic effect.    ADVANTAGE - The contact layer provides superior adhesive strength with the electrode including a conductive metal and the base substrate including the silicon, so that a contact resistance between the base substrate including the doped pattern and the electrode can be decreased, and the doped pattern and the electrode are formed on interfaces of the contact layer that can be uniformly formed, thus improving power efficiency of the solar cell.    DETAILED DESCRIPTION - The contact layer comprises a silicon-germanium (SiGe) doped with a dopant and silicon (Si) doped with the dopant. The dopant comprises boron (B), aluminum (Al), gallium (Ga), indium (In), phosphorus (P), and arsenic (As). The passivation layer is made of aluminum oxide. The electrode is made of aluminum (Al), silver (Ag), titanium (Ti), copper (Cu), tungsten (W), tin (Sn), and titanium nitride. The doped pattern includes a p-type semiconductor. The insulating layer is made of silicon nitride (SiNx). The base substrate is a p-type silicon substrate. An INDEPENDENT CLAIM is also included for a method for manufacturing a solar cell.    DESCRIPTION OF DRAWING(S) - The drawing shows a perspective view of a solar cell.    Surface of base substrate (11)    Base substrate (30)    Insulating layer (330)    Electrode (530)    Contact layer (730)