Has anyone thought of printing solar cells with 3D RepRap? I know wires, especially at that scale, are not being laid yet by RepRap, but a solar cell is a rather simple device and even if low efficiency cells could be printed, this would be a major advance.

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maitri982
a solar cell is a rather simple device

Is it? I don't know too much about them, but aren't they made in clean rooms from silicon wafers at hundreds of degrees Celsius?

I'd think the way to go for printable solar power is printing concentrators, for focusing light either onto purchased solar cells, or else onto Stirling engines. A concentrator could even just be some kind of light frame for tensioning sheets of mylar or aluminum foil into the correct shape.