Solar cell module
A solar cell module includes a plurality of solar cells each comprising a substrate, an emitter region placed at the substrate, and an anti-reflection region placed on the emitter region. The anti-reflection region includes a first opening region through which part of the emitter region is exposed and one or more second opening regions through which part of the emitter region is exposed. A first electrode is connected to the exposed emitter region of the first opening region through the anti-reflection region by metal plating and a first bus bar is connected to the exposed emitter region of one or more second opening regions through the anti-reflection region by metal plating.
1. A solar cell module, comprising:
a plurality of solar cells each comprising a substrate having a first conductive type, an emitter region having a second conductive type opposite to the first conductive type of the substrate and at a front surface of the substrate, an anti-reflection region on a front surface of the emitter region, first electrodes on the front surface of the substrate, first bus bars on a front surface of the substrate and connected to the first electrodes, second electrodes on a back surface of the substrate, and second bus bars on the back surface of the substrate and connected to the second electrodes; and
an interconnector to electrically connect a first bus bar of one of the plurality of solar cells to a first bus bar of an adjacent solar cell or to a second bus bar of an adjacent solar cell of the plurality of solar cells,
wherein the anti-reflection region comprises a plurality of first opening regions through which a portion of the emitter region is exposed and a plurality of second opening regions through which a different portion of the emitter region is exposed,
wherein each of the first electrodes is connected to the exposed emitter region through each of the first opening regions by metal plating and each of the first bus bars is connected to the exposed emitter region through the plurality of second opening regions by metal plating,
wherein each of first electrodes extends in a first direction, and each of first bus bars extends in a second direction crossing the first direction,
wherein each of first opening regions extends in the first direction, and each of second opening regions extends in the second direction, and
wherein each of first bus bars is overlapped with at least two of second opening regions of the plurality of second opening regions.
2. The solar cell module as claimed in claim 1 , wherein a resistance value of the exposed emitter region of the plurality of first opening region is greater than a resistance value of the exposed emitter region of the plurality of second opening regions.
3. The solar cell module as claimed in claim 1 , further comprising a conductive adhesion film between one of the first bus bars and the second bus bar and the interconnector, and contains a plurality of conductive particles dispersed in resin to electrically connect one of the first bus bars and the second bus bar and the interconnector.
4. The solar cell module as claimed in claim 3 , wherein at least one of the plurality of conductive particles has a thickness greater than or equal to a thickness of the conductive adhesion film.
5. The solar cell module as claimed in claim 3 , wherein
at least one of the plurality of conductive particles is embedded in at least one of the interconnector and the first bus bar or the second bus bar.
6. The solar cell module as claimed in claim 3 , wherein at least one of the plurality of conductive particles has a thickness smaller than a thickness of the conductive adhesion film.
7. The solar cell module as claimed in claim 6 , wherein two or more of the plurality of conductive particles have a direct contact with each other to have direct contact with at least one of the interconnector and the first bus bar or the second bus bar.
8. The solar cell modules as claimed in claim 6 , wherein two or more of the plurality of conductive particles have an indirect contact with each other to have indirect contact with at least one of the interconnector and the first bus bar or the second bus bar.
9. The solar cell module as claimed in claim 3 , wherein the conductive particles include a metal-coated resin particle selected from the group consisting of copper (Cu), silver (Ag), gold (Au), iron (Fe), nickel (Ni), lead (Pb), zinc (Zn), cobalt (Co), titanium (Ti), and magnesium (Mg).
10. The solar cell module as claimed in claim 3 , wherein the conductive particles include a metal particle selected from the group consisting of copper (Cu), silver (Ag), gold (Au), iron (Fe), nickel (Ni), lead (Pb), zinc (Zn), cobalt (Co), titanium (Ti), and magnesium (Mg).
11. The solar cell module as claimed in claim 3 , wherein at least one of the plurality of conductive particles has a circle, an oval, or a radial shape.
12. The solar cell module as claimed in claim 3 , wherein at least one of the conductive particles has irregular or protruded portions.
13. The solar cell module as claimed in claim 1 , wherein the interconnector includes a conductive metal.
14. The solar cell module as claimed in claim 13 , wherein the conductive metal comprises a lead component of 1,000 ppm or less.
15. The solar cell module as claimed in claim 13 , wherein the interconnector further comprises solder coated on a surface of the conductive metal.
16. The solar cell module as claimed in claim 1 , wherein at least one of the first bus bar and the second bus bar comprises an uneven surface.
17. The solar cell module as claimed in claim 3 , wherein the conductive adhesion film has a width identical with a width of at least one of the first bus bar and the second bus bar.
18. The solar cell module as claimed in claim 3 , wherein the conductive adhesion film has a greater width than at least one of the first bus bar and the second bus bar.
19. The solar cell module as claimed in claim 1 , wherein the anti-reflection region further comprises a plurality of grooves spaced apart from the plurality of second opening regions having the anti-reflection region or the emitter region exposed therethrough.
20. The solar cell module as claimed in claim 1 , wherein nickel silicide is included between the substrate and at least one of the first electrode and the first bus bar.
21. The solar cell module as claimed in claim 1 , wherein at least one of the first electrode and the first bus bar is formed by the metal plating to include a curved surface shape.
22. The solar cell module as claimed in claim 1 , wherein at least one of the first electrode and the first bus bar comprises:
a first film plated on the substrate including nickel (Ni), and
a second film plated on the first film including silver (Ag) or copper (Cu).
23. The solar cell module as claimed in claim 22 , further comprising a third film plated on the second film including silver (Ag), or tin (Sn) when the second film includes copper (Cu).
24. The solar cell module as claimed in claim 1 , wherein:
a first surface of at least one of the first bus bar and the second bus bar coming in contact with the conductive adhesion film has a convex curved surface.
25. The solar cell module as claimed in claim 3 , wherein a height at a center of the conductive adhesion film is smaller than a height at an edge of the conductive adhesion film.