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New concentrator could help solar panels capture more sunlight  – without tracking it

It could even help concentrate diffused light on cloudy days.

Different stages of the graded index glass pyramid fabrication
Different stages of the graded index glass pyramid fabrication: when in optical contact with a solar cell, the pyramid at the final step (bottom right corner) absorbs and concentrates most of the incident light and appears dark. Credit: Nina Vaidya
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