Solar cell and solar cell panel including the same

A solar cell comprising:

• a semiconductor substrate;
• a conductive region disposed in or on the semiconductor substrate;
• and
• an electrode comprising a plurality of finger lines connected to the conductive region, and formed to extend in a first direction while being parallel, and 6 or more bus bar lines formed to extend in a second direction crossing the first direction, each of the bus bar lines having a width of 35 to 350 pm at at least a portion thereof,
• wherein the each of the bus bar lines has a distance between opposite ends thereof in the second direction smaller than a distance between outermost ones of the finger lines respectively disposed at opposite sides of the semiconductor substrate in the second direction,
• wherein the each of the bus bar lines comprises a plurality of pad sections arranged to be spaced apart from one another in the second direction,
• wherein the plurality of pad sections comprise:
• first pad sections having a length in the second direction greater than a width of the plurality of finger lines, wherein the first pad sections are disposed at the opposite ends of the bus bar lines in the second direction, and
• second pad sections having a length in the second direction greater than the width of the plurality of finger lines, and the length in the second direction smaller than the length in the second direction of the first pad sections,
• wherein a distance between the first pad sections and an edge of the solar cell adjacent thereto is greater than a distance between the outermost ones of the finger lines and the edge of the solar cell adjacent thereto,
• wherein an edge area is defined between one end of one of the bus bar lines and the edge of the solar cell adjacent thereto or between the other end of the one of the bus bar lines and the edge of the solar cell adjacent thereto,
• wherein the edge area includes:
• first edge areas defined between neighboring finger lines,
• second edge areas corresponding to a remaining portion of the edge area except for the first edge areas, and being defined between the outermost ones of the finger lines and the edge of the solar cell adjacent thereto,
• wherein a lead is disposed in the first edge areas, and is space apart from the edge of the solar cell adjacent thereto, and
• wherein the first pad sections are disposed adjacent to the first edge areas,
• wherein when “L” represents a width of the edge area at a position adjacent to a corresponding one of the edges of the solar cell, and “D” represents an edge distance being a length of the edge area, “L” and “D” satisfy the following Expression:
• 0.9*(0.1569*D+0.3582)<L<1.1*(0.1569*D+0.3582) <Expression>
• where, the unit of “L” is mm, and the unit of “D” is mm.