30 Dec '12, 4pm

Solar PV Efficiency Record Broken (Now 44%), Thanks To NREL & Solar Junction

Solar PV Efficiency Record Broken (Now 44%), Thanks To NREL & Solar Junction

This behavior sets a fundamental limit on the efficiency of a conventional solar cell. Scientists overcome this limitation by using multijunction solar cells. Using multiple layers of materials in the cells, they create multiple junctions, each with different band gap energies. Each converts a different energy range of the solar spectrum. An invention in the mid-1980s by NREL’s Jerry Olson and Sarah Kurtz led to the first practical, commercial multijunction solar cell, a GaInP/GaAs two-junction cell with 1.85-eV and 1.4-eV bandgaps that was recognized with an R&D 100 award in 1990, and later to the three-junction commercial cell based on GaInP/GaAs/Ge that won an R&D 100 award in 2001.

Full article: http://cleantechnica.com/2012/12/30/solar-pv-efficiency-r...

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