Heat transparent high intensity high efficiency solar cell

A heat transparent high intensity solar cell having improved efficiency comprising

• a semiconductor substrate having a plurality of grooves on at least one surface thereof, each of said grooves having a first face substantially normal to said surface and a second face angularly disposed to said first surface,
• a photovoltaic junction in said substrate adjacent to said grooves, said junction having one portion in substantial juxtaposition with said first face and another portion in substantial juxtaposition with said second face, and
• reflecting means adjacent to said second face of each groove, said reflecting means including
• a first mirror surface for directing entering light rays into said solar cell through said first face to traverse said one portion of said junction, and for directing emerging light rays from said first face of said groove away from said solar cell after traversing said one portion of said junction, and
• a second mirror surface oppositely disposed from said first mirror surface for directing said entering light rays toward an opposite surface of said solar cell whereby said entering light rays repeatedly traverse said other portion of said junction, and for directing said emerging light rays toward said first face whereby said emerging light rays repeatedly traverse said other portion of said junction.