Photo of ultrathin on-chip solar cells (IMAGE)

American Institute of Physics

Photo of ultrathin on-chip solar cells

Caption

Photo of ultrathin on-chip solar cells. The cells are the green squares and include an ultrathin layer of light-absorbing GaAs, which is key to their radiation tolerance. The surface of each green square is only 120 nanometers, about one-thousandth the thickness of a human hair, above the surrounding gray area. The gold-colored grids are electrically conducting metal contacts.

Credit

Armin Barthel

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