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New Generation Silicon Solar Cells

5.5 Solar cell contacts

Saturn-solar-cell Laser Grooved Buried Contact (LGBC)

Laser will burn a trench in the front side of the solar cell

Trench is 35µm deep and 20µm wide and has form of a „U“ or a „V“

Trench will chemically be filled up with the front contact material, usually silver

a large metal hight-to-width aspect ratio

allows closely spaced metal findgers

low parasitic resistance losses

advantages:

Shading losses will only be 2% to 3%

Reduction of metall grid and contact

resistance

Reduction of emitter resistance

because of very close fingers

Possible efficiency >17%

LGBC-cell

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