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SunPower_Solar_cellsSunPower have been using a design that places the positive contacts on the reverse of their commercially available solar panels for a number of years now. Because the contacts don't shade the front of the cells the overall efficiency of the unit is greatly improved.1
Panasonic_solar_cell_breakthroughPanasonic has gained the edge on its two competitors by virtue of its more efficient silicon-based solar cells.2
