NOVELTY - The solar cell (100) has back electrode (110) set on back surface (123) of photoelectric conversion layer (120), electrically conductive fingers (130) set on front surface (121) of photoelectric conversion layer and primary bus bars (140) set on front surface of photoelectric conversion layer. Each primary bus bar is electrically connected to electrically conductive fingers. The 4 to 12 primary bus bars are set on front surface of photoelectric conversion layer. The primary bus bars on front surface of photoelectric conversion layer have total surface area of at most 4 square centimeters.    USE - Solar cell e.g. silicon solar cell, polycrystalline silicon solar cell for solar module (claimed).    ADVANTAGE - Increases photoelectric conversion efficiency of the solar cell by having 4 to 12 primary bus bars on front surface of photoelectric conversion layer. Improves soldering strength between primary bus bars and ribbons and reduces power loss of solar cell e.g. caused by damage to the electrical connections between primary bus bars and ribbons or caused by soldering issues between primary bus bars and ribbons by using secondary bus bars to connect nodes in primary bus bars. Reduces consumption of expensive conductive materials e.g. silver by using relatively large number e.g. 4-12 primary bus bars in solar cell with relatively small total surface area, thus reducing production costs while still maintaining or improving the photoelectric conversion efficiency e.g. to at least about 17 percent of the solar cell. Improves photoelectric conversion efficiency of the solar cell by arranging two neighboring primary bus bars in the back electrode in offset manner to reduce the distance for transferring charge carriers to back electrode.    DESCRIPTION OF DRAWING(S) - The drawing shows a perspective view of the solar cell having five primary bus bars.    Solar cell (100)    Back electrode (110)    Photoelectric conversion layer (120)    Front surface (121)    Back surface (123)    Electrically conductive fingers (130)    Primary bus bars (140)