US scientists have made light-tracking, three-junction tandem PV cells with an active area of 650 × 650 square micrometers. They are based on indium gallium phosphide, gallium arsenide, and indium gallium arsenide antimony nitride and use photonic crystal film for maximum efficiency.
Physicists at MIT and in Haifa have come up with a theory for slowing down light that could dramatically improve solar PV cell efficiency – the question now is whether it will work in practice, and on silicon.
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