Solar cell and solar cell panel including the same
A solar cell is disclosed. The disclosed solar cell includes a semiconductor substrate, a conductive region disposed in or on the semiconductor substrate, and an electrode including 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 bus bar line has a width of 35 to 350 μm at at least a portion thereof. Each bus bar line 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 in the second direction.
1. 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.
2. The solar cell according to claim 1 , wherein:
the 6 or more bus bar lines have a first distance between two neighboring ones of the bus bar lines, and a second distance between one of the bus bar lines adjacent to an edge of the solar cell and the edge of the solar cell, the second distance being greater than the first distance; and
an edge distance is defined between one end of the 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, the edge distance being smaller than the first distance and the second distance.
3. The solar cell according to claim 1 , wherein each of the bus bar lines further comprise a line section connecting the plurality of pad sections in the second direction while having a smaller width than the plurality of pad sections.
4. The solar cell according to claim 3 , wherein the first pad sections and the second pad sections have different widths in the first direction.
5. The solar cell according to claim 4 , wherein:
the width in the first direction of the first pad sections is greater than the width in the first direction of the second pad sections; and
the first pad sections are disposed at opposite ends of the line section in the second direction, respectively.
6. The solar cell according to claim 1 , wherein an edge distance of 2.37 to 21.94 mm is defined between the one end of the 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.
7. The solar cell according to claim 6 , wherein the edge distance is 9 to 15.99 mm.
8. The solar cell according to claim 1 , wherein the edge area has a width of 0.73 to 3 mm at a position adjacent to a corresponding one of the edges of the solar cell.