TECHNOLOGY FOCUS - ELECTRICAL POWER AND ENERGY - Preferred Components: The solar cell further comprises a first electrode and a second electrode disposed on the passivation layer. The passivation layer includes many first contact holes and many second contact holes, where the first electrode and the first doping region are connected to each other through first contact holes, and the second electrode and the second doping region are connected to each other through the second contact holes. The first electrode extends with a straight line shape along a third direction, and the third direction forms an angle of 45 degrees with at least one of the first direction or the second direction, respectively. The first electrode and the second electrode respectively include a portion which extends with a zigzag shape. The first doping region and the second doping region have a quadrangle shape from a top plane view. In the solar cell light is absorbed through the front side of the substrate. The first doping region and the second doping region include different types of conductive impurities. Preferred Method: The diffusion of the impurity to form the first doping region and the second doping region comprises a heat treatment. The first doping region and the second doping region are alternately arranged/ formed according to a first direction and a second direction, respectively, and the first direction and the second direction are substantially perpendicular to each other. The substrate includes a front side and a back side, where the first doping region and the second doping region are formed/ disposed in the back side of the substrate. The methods (M1) and (M2) further comprises: removing the first doping layer, the diffusion preventing layer, and the second doping layer; disposing the passivation layer having many first contact holes and many second contact holes on the back side of the substrate; and disposing the first electrode and the second electrode on the passivation layer. The PN conjunction of the first doping region and the second doping region is formed through a heat treatment process.