The shiny metal on top of a solar cell reflects sunlight away from the semiconductor where electricity is produced, reducing the cell's efficiency. Now, scientists have discovered how to hide the reflective upper contact and funnel light directly to the semiconductor below.

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The shiny metal on top of a solar cell reflects sunlight away from the semiconductor where electricity is produced, reducing the cell's efficiency. Now, scientists have discovered how to hide the reflective upper contact and funnel light directly to the semiconductor below.