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New solar cells show gains in efficiency.
Thin but efficient solar cells use one-tenth the silicon of conventional cells.
A California startup is cutting by half the amount of costly silicon used in solar panels.
Research shows that silicon can wring two electrons from each photon of incoming light.
Cyrus Wadia is using abundant materials to grow nanocrystals for cheaper photovoltaics.
A simple method applies nanoscale texturing over large areas.