Amplifying the Sun With Aluminum Reflectors

I boosted battery capacity in my solar porch lights by adding an aluminum reflectors to double sunlight on the PV chip on top of my solar porch lights. Why are we still ignoring concentrated solar power for utility scale purposes as well as retail solar products? We can add aluminum reflectors to boost photovoltaic performance by two, three or even four times. I don't have the stats but there are none whatsoever anywhere, anyway. Why is aluminum the most neglected metal around?? Environmentalists seem to favor coal over aluminum for investment purposes. I just don't get it... Any enlightenment, anybody?

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